Articles | Volume 18, issue 23
https://doi.org/10.5194/acp-18-16979-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-18-16979-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
30 Nov 2018
Research article |
| 30 Nov 2018
| 30 Nov 2018
Elucidating real-world vehicle emission factors from mobile measurements over a large metropolitan region: a focus on isocyanic acid, hydrogen cyanide, and black carbon
Sumi N. Wren
CORRESPONDING AUTHOR
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
John Liggio
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
Yuemei Han
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
Katherine Hayden
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
Gang Lu
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
Cris M. Mihele
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
Richard L. Mittermeier
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
Craig Stroud
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
Jeremy J. B. Wentzell
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
Jeffrey R. Brook
CORRESPONDING AUTHOR
Air Quality Process Research Section, Air Quality Research Division, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada
currently at: Dalla Lana School of Public Health, Department of Chemical Engineering and Applied Chemistry, University of Toronto, 223 College St., Toronto, ON, M5T 1R4, Canada
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Jenna C. Ditto, Megan He, Tori N. Hass-Mitchell, Samar G. Moussa, Katherine Hayden, Shao-Meng Li, John Liggio, Amy Leithead, Patrick Lee, Michael J. Wheeler, Jeremy J. B. Wentzell, and Drew R. Gentner
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Alex K. Y. Lee, Max G. Adam, John Liggio, Shao-Meng Li, Kun Li, Megan D. Willis, Jonathan P. D. Abbatt, Travis W. Tokarek, Charles A. Odame-Ankrah, Hans D. Osthoff, Kevin Strawbridge, and Jeffery R. Brook
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Nathan Hilker, Jonathan M. Wang, Cheol-Heon Jeong, Robert M. Healy, Uwayemi Sofowote, Jerzy Debosz, Yushan Su, Michael Noble, Anthony Munoz, Geoff Doerksen, Luc White, Céline Audette, Dennis Herod, Jeffrey R. Brook, and Greg J. Evans
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Kun Li, John Liggio, Patrick Lee, Chong Han, Qifan Liu, and Shao-Meng Li
Atmos. Chem. Phys., 19, 9715–9731, https://doi.org/10.5194/acp-19-9715-2019, https://doi.org/10.5194/acp-19-9715-2019, 2019
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A new oxidation flow reactor was developed and applied to study the secondary organic aerosol (SOA) formation from precursors associated with oil-sands (OS) operations. The results reveal that the SOA yields from OS precursors are related to the volatilities of precursors and that open-pit mining is the main source of SOA formed from oil sands. In addition, cyclic alkanes are found to play an important role in SOA formation from oil-sands precursors.
Jonathan P. D. Abbatt, W. Richard Leaitch, Amir A. Aliabadi, Allan K. Bertram, Jean-Pierre Blanchet, Aude Boivin-Rioux, Heiko Bozem, Julia Burkart, Rachel Y. W. Chang, Joannie Charette, Jai P. Chaubey, Robert J. Christensen, Ana Cirisan, Douglas B. Collins, Betty Croft, Joelle Dionne, Greg J. Evans, Christopher G. Fletcher, Martí Galí, Roya Ghahreman, Eric Girard, Wanmin Gong, Michel Gosselin, Margaux Gourdal, Sarah J. Hanna, Hakase Hayashida, Andreas B. Herber, Sareh Hesaraki, Peter Hoor, Lin Huang, Rachel Hussherr, Victoria E. Irish, Setigui A. Keita, John K. Kodros, Franziska Köllner, Felicia Kolonjari, Daniel Kunkel, Luis A. Ladino, Kathy Law, Maurice Levasseur, Quentin Libois, John Liggio, Martine Lizotte, Katrina M. Macdonald, Rashed Mahmood, Randall V. Martin, Ryan H. Mason, Lisa A. Miller, Alexander Moravek, Eric Mortenson, Emma L. Mungall, Jennifer G. Murphy, Maryam Namazi, Ann-Lise Norman, Norman T. O'Neill, Jeffrey R. Pierce, Lynn M. Russell, Johannes Schneider, Hannes Schulz, Sangeeta Sharma, Meng Si, Ralf M. Staebler, Nadja S. Steiner, Jennie L. Thomas, Knut von Salzen, Jeremy J. B. Wentzell, Megan D. Willis, Gregory R. Wentworth, Jun-Wei Xu, and Jacqueline D. Yakobi-Hancock
Atmos. Chem. Phys., 19, 2527–2560, https://doi.org/10.5194/acp-19-2527-2019, https://doi.org/10.5194/acp-19-2527-2019, 2019
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Victoria E. Irish, Sarah J. Hanna, Megan D. Willis, Swarup China, Jennie L. Thomas, Jeremy J. B. Wentzell, Ana Cirisan, Meng Si, W. Richard Leaitch, Jennifer G. Murphy, Jonathan P. D. Abbatt, Alexander Laskin, Eric Girard, and Allan K. Bertram
Atmos. Chem. Phys., 19, 1027–1039, https://doi.org/10.5194/acp-19-1027-2019, https://doi.org/10.5194/acp-19-1027-2019, 2019
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Kevin B. Strawbridge, Michael S. Travis, Bernard J. Firanski, Jeffrey R. Brook, Ralf Staebler, and Thierry Leblanc
Atmos. Meas. Tech., 11, 6735–6759, https://doi.org/10.5194/amt-11-6735-2018, https://doi.org/10.5194/amt-11-6735-2018, 2018
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Travis W. Tokarek, Charles A. Odame-Ankrah, Jennifer A. Huo, Robert McLaren, Alex K. Y. Lee, Max G. Adam, Megan D. Willis, Jonathan P. D. Abbatt, Cristian Mihele, Andrea Darlington, Richard L. Mittermeier, Kevin Strawbridge, Katherine L. Hayden, Jason S. Olfert, Elijah G. Schnitzler, Duncan K. Brownsey, Faisal V. Assad, Gregory R. Wentworth, Alex G. Tevlin, Douglas E. J. Worthy, Shao-Meng Li, John Liggio, Jeffrey R. Brook, and Hans D. Osthoff
Atmos. Chem. Phys., 18, 17819–17841, https://doi.org/10.5194/acp-18-17819-2018, https://doi.org/10.5194/acp-18-17819-2018, 2018
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Measurements of air pollutants at a ground site near Fort McKay in the Athabasca oil sands region in the summer of 2013 are presented. A large number of intermediate-volatility organic compounds (IVOCs) were observed; these molecules were shown previously to generate atmospheric particles downwind of the region. A principal component analysis was performed to identify major pollution source types, including which source(s) is(are) associated with IVOC emissions (e.g., freshly mined bitumen).
Meng Si, Victoria E. Irish, Ryan H. Mason, Jesús Vergara-Temprado, Sarah J. Hanna, Luis A. Ladino, Jacqueline D. Yakobi-Hancock, Corinne L. Schiller, Jeremy J. B. Wentzell, Jonathan P. D. Abbatt, Ken S. Carslaw, Benjamin J. Murray, and Allan K. Bertram
Atmos. Chem. Phys., 18, 15669–15685, https://doi.org/10.5194/acp-18-15669-2018, https://doi.org/10.5194/acp-18-15669-2018, 2018
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Using the concentrations of ice-nucleating particles (INPs) and total aerosol particles measured at three coastal marine sites, the ice-nucleating ability of aerosol particles on a per number basis and a per surface-area basis were determined as a function of size. The ice-nucleating ability was strongly dependent on size, with larger particles being more efficient. This type of information can help determine the sources of INPs and constrain the future modelling of INPs and mixed-phase clouds.
Craig A. Stroud, Paul A. Makar, Junhua Zhang, Michael D. Moran, Ayodeji Akingunola, Shao-Meng Li, Amy Leithead, Katherine Hayden, and May Siu
Atmos. Chem. Phys., 18, 13531–13545, https://doi.org/10.5194/acp-18-13531-2018, https://doi.org/10.5194/acp-18-13531-2018, 2018
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It is shown that using measurement-derived volatile organic compound (VOC) and organic aerosol (OA) emissions in the GEM-MACH air quality model provides better overall predictions compared to using bottom-up emission inventories. This work was done to better constrain the fugitive organic emissions from the Athabasca oil sands region, which are a challenge to estimate with bottom-up emission approaches. We use observations from the 2013 Joint Oil Sands Monitoring study.
Emma L. Mungall, Jonathan P. D. Abbatt, Jeremy J. B. Wentzell, Gregory R. Wentworth, Jennifer G. Murphy, Daniel Kunkel, Ellen Gute, David W. Tarasick, Sangeeta Sharma, Christopher J. Cox, Taneil Uttal, and John Liggio
Atmos. Chem. Phys., 18, 10237–10254, https://doi.org/10.5194/acp-18-10237-2018, https://doi.org/10.5194/acp-18-10237-2018, 2018
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We measured gas-phase formic and acetic acid at Alert, Nunavut. These acids play an important role in cloud water acidity in remote environments, yet they are not well represented in chemical transport models, particularly in the Arctic. We observed high levels of formic and acetic acid under both cold, wet, and cloudy and warm, sunny, and dry conditions, suggesting that multiple sources significantly contribute to gas-phase concentrations of these species in the summer Arctic.
Paul A. Makar, Ayodeji Akingunola, Julian Aherne, Amanda S. Cole, Yayne-abeba Aklilu, Junhua Zhang, Isaac Wong, Katherine Hayden, Shao-Meng Li, Jane Kirk, Ken Scott, Michael D. Moran, Alain Robichaud, Hazel Cathcart, Pegah Baratzedah, Balbir Pabla, Philip Cheung, Qiong Zheng, and Dean S. Jeffries
Atmos. Chem. Phys., 18, 9897–9927, https://doi.org/10.5194/acp-18-9897-2018, https://doi.org/10.5194/acp-18-9897-2018, 2018
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Complex computer model output was compared to and fused with observation data, to estimate potential damage due to acidifying precipitation for ecosystems in the Canadian provinces of Alberta and Saskatchewan. Estimated deposition was compared to the maximum no-damage ecosystem capacity for sulfur and/or nitrogen uptake; these critical loads were exceeded, for areas between 10 000 and 330 000 square kilometres, depending on ecosystem type: ecosystem damage will occur at 2013 emission levels.
Cynthia H. Whaley, Elisabeth Galarneau, Paul A. Makar, Ayodeji Akingunola, Wanmin Gong, Sylvie Gravel, Michael D. Moran, Craig Stroud, Junhua Zhang, and Qiong Zheng
Geosci. Model Dev., 11, 2609–2632, https://doi.org/10.5194/gmd-11-2609-2018, https://doi.org/10.5194/gmd-11-2609-2018, 2018
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We present a new, high-resolution, North American model of PAHs and benzene, which are toxic air pollutants that cause a variety of negative health impacts. Our simulation in a densely populated region of Canada and the U.S. shows that the model is improved over a previous model. The new model is particularly refined regarding the gas–particle partitioning of these pollutants, which has impacts on deposition and inhalation. The simulation was sensitive to the selection of vehicle emissions.
Sabour Baray, Andrea Darlington, Mark Gordon, Katherine L. Hayden, Amy Leithead, Shao-Meng Li, Peter S. K. Liu, Richard L. Mittermeier, Samar G. Moussa, Jason O'Brien, Ralph Staebler, Mengistu Wolde, Doug Worthy, and Robert McLaren
Atmos. Chem. Phys., 18, 7361–7378, https://doi.org/10.5194/acp-18-7361-2018, https://doi.org/10.5194/acp-18-7361-2018, 2018
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Methane emissions from major oil sands facilities in the Athabasca Oil Sands Region (AOSR) of Alberta were measured in the summer of 2013 using two related aircraft mass-balance approaches. Tailings ponds and fugitive emissions of methane from open pit mines were found to be the major sources of methane in the region. Total methane emissions in the AOSR were measured to be ~ 20 tonnes of CH4 per hour, which is 48 % higher than the Canadian Greenhouse Gas Reporting Program Emissions Inventory.
Stephanie C. Pugliese, Jennifer G. Murphy, Felix R. Vogel, Michael D. Moran, Junhua Zhang, Qiong Zheng, Craig A. Stroud, Shuzhan Ren, Douglas Worthy, and Gregoire Broquet
Atmos. Chem. Phys., 18, 3387–3401, https://doi.org/10.5194/acp-18-3387-2018, https://doi.org/10.5194/acp-18-3387-2018, 2018
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We developed the Southern Ontario CO2 Emissions (SOCE) inventory, which identifies the spatial and temporal distribution (2.5 km and hourly, respectively) of CO2 emissions from seven source sectors. When the SOCE inventory was used with a chemistry transport model, we found strong agreement between modelled and measured mixing ratios. We were able to quantify that natural gas combustion contributes > 80 % of CO2 emissions at nighttime while on-road emissions contribute > 70 % during the day.
Yuan You, Ralf M. Staebler, Samar G. Moussa, Yushan Su, Tony Munoz, Craig Stroud, Junhua Zhang, and Michael D. Moran
Atmos. Chem. Phys., 17, 14119–14143, https://doi.org/10.5194/acp-17-14119-2017, https://doi.org/10.5194/acp-17-14119-2017, 2017
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A novel approach for traffic emission measurements is shown to have the capacity to provide high-time-resolution accurate concentrations of key air pollutants. A top-down method for quantifying real-world emission rates produced vehicular emission factor estimates for carbon monoxide that agreed well with bottom-up values. Significant ammonia and hydrogen cyanide emissions were observed. The main factors modulating the concentrations were turbulent mixing and traffic density.
Catherine Phillips-Smith, Cheol-Heon Jeong, Robert M. Healy, Ewa Dabek-Zlotorzynska, Valbona Celo, Jeffrey R. Brook, and Greg Evans
Atmos. Chem. Phys., 17, 9435–9449, https://doi.org/10.5194/acp-17-9435-2017, https://doi.org/10.5194/acp-17-9435-2017, 2017
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The sources of PM2.5 components exhibited short-term variabilities, and their contributions were identified in the Athabasca oil sands region. Much of the trace elements were found to originate from anthropogenic activities, i.e., oil sands upgrading and on- and off-road transportation. Some of these anthropogenic activities became better defined and understood only through highly time-resolved measurements, which can help guide further studies and policy decisions in the oil sands area.
John Liggio, Samar G. Moussa, Jeremy Wentzell, Andrea Darlington, Peter Liu, Amy Leithead, Katherine Hayden, Jason O'Brien, Richard L. Mittermeier, Ralf Staebler, Mengistu Wolde, and Shao-Meng Li
Atmos. Chem. Phys., 17, 8411–8427, https://doi.org/10.5194/acp-17-8411-2017, https://doi.org/10.5194/acp-17-8411-2017, 2017
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The emission and formation of gaseous organic acids from the oil sands industry in Canada is explored through aircraft measurements directly over and downwind wind of industrial facilities. Results demonstrated that the formation of organic acids through atmospheric chemical reactions dominated over the direct emissions from mining activities but could not be explicitly modeled. The results highlight the need for improved understanding of photochemical mechanisms leading to these species.
Yuemei Han, Craig A. Stroud, John Liggio, and Shao-Meng Li
Atmos. Chem. Phys., 16, 13929–13944, https://doi.org/10.5194/acp-16-13929-2016, https://doi.org/10.5194/acp-16-13929-2016, 2016
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This study investigates the acidity effect on the yield and chemical composition of α-pinene secondary organic aerosol based on a series of laboratory experiments performed using a photochemical reaction chamber under high- and low-NOx conditions. We have found that the acidity effect largely depends on NOx level and the inorganic acidity has a significant role to play in determining various organic aerosol chemical properties such as mass yields, oxidation state, and organic nitrate content.
Graydon Snider, Crystal L. Weagle, Kalaivani K. Murdymootoo, Amanda Ring, Yvonne Ritchie, Emily Stone, Ainsley Walsh, Clement Akoshile, Nguyen Xuan Anh, Rajasekhar Balasubramanian, Jeff Brook, Fatimah D. Qonitan, Jinlu Dong, Derek Griffith, Kebin He, Brent N. Holben, Ralph Kahn, Nofel Lagrosas, Puji Lestari, Zongwei Ma, Amit Misra, Leslie K. Norford, Eduardo J. Quel, Abdus Salam, Bret Schichtel, Lior Segev, Sachchida Tripathi, Chien Wang, Chao Yu, Qiang Zhang, Yuxuan Zhang, Michael Brauer, Aaron Cohen, Mark D. Gibson, Yang Liu, J. Vanderlei Martins, Yinon Rudich, and Randall V. Martin
Atmos. Chem. Phys., 16, 9629–9653, https://doi.org/10.5194/acp-16-9629-2016, https://doi.org/10.5194/acp-16-9629-2016, 2016
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We examine the chemical composition of fine particulate matter (PM2.5) collected on filters at traditionally undersampled, globally dispersed urban locations. Several PM2.5 chemical components (e.g. ammonium sulfate, ammonium nitrate, and black carbon) vary by more than an order of magnitude between sites while aerosol hygroscopicity varies by a factor of 2. Enhanced anthropogenic dust fractions in large urban areas are apparent from high Zn : Al ratios.
Vitali E. Fioletov, Chris A. McLinden, Alexander Cede, Jonathan Davies, Cristian Mihele, Stoyka Netcheva, Shao-Meng Li, and Jason O'Brien
Atmos. Meas. Tech., 9, 2961–2976, https://doi.org/10.5194/amt-9-2961-2016, https://doi.org/10.5194/amt-9-2961-2016, 2016
Alex K. Y. Lee, Jonathan P. D. Abbatt, W. Richard Leaitch, Shao-Meng Li, Steve J. Sjostedt, Jeremy J. B. Wentzell, John Liggio, and Anne Marie Macdonald
Atmos. Chem. Phys., 16, 6721–6733, https://doi.org/10.5194/acp-16-6721-2016, https://doi.org/10.5194/acp-16-6721-2016, 2016
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Substantial biogenic secondary organic aerosol (BSOA) formation was investigated in a coniferous forest mountain region in Whistler, British Columbia. A largely biogenic aerosol growth episode was observed, providing a unique opportunity to investigate BSOA formation chemistry in a forested environment. In particular, our observations provide insights into the relative importance of different oxidation mechanisms between day and night.
Emma L. Mungall, Betty Croft, Martine Lizotte, Jennie L. Thomas, Jennifer G. Murphy, Maurice Levasseur, Randall V. Martin, Jeremy J. B. Wentzell, John Liggio, and Jonathan P. D. Abbatt
Atmos. Chem. Phys., 16, 6665–6680, https://doi.org/10.5194/acp-16-6665-2016, https://doi.org/10.5194/acp-16-6665-2016, 2016
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Previous work has suggested that marine emissions of dimethyl sulfide (DMS) could impact the Arctic climate through interactions with clouds. We made the first high-time-resolution measurements of summertime atmospheric DMS in the Canadian Arctic, and performed source sensitivity simulations. We found that regional marine sources dominated, but do not appear to be sufficient to explain our observations. Understanding DMS sources in the Arctic is necessary to model future climate in the region.
Bin Yuan, John Liggio, Jeremy Wentzell, Shao-Meng Li, Harald Stark, James M. Roberts, Jessica Gilman, Brian Lerner, Carsten Warneke, Rui Li, Amy Leithead, Hans D. Osthoff, Robert Wild, Steven S. Brown, and Joost A. de Gouw
Atmos. Chem. Phys., 16, 2139–2153, https://doi.org/10.5194/acp-16-2139-2016, https://doi.org/10.5194/acp-16-2139-2016, 2016
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We describe high-resolution measurements of nitrated phenols using a time-of-flight chemical ionization mass spectrometer (ToF-CIMS). Strong diurnal profiles were observed for nitrated phenols, with concentration maxima at night. Box model simulations were able to reproduce the measured nitrated phenols.
M. W. Shephard, C. A. McLinden, K. E. Cady-Pereira, M. Luo, S. G. Moussa, A. Leithead, J. Liggio, R. M. Staebler, A. Akingunola, P. Makar, P. Lehr, J. Zhang, D. K. Henze, D. B. Millet, J. O. Bash, L. Zhu, K. C. Wells, S. L. Capps, S. Chaliyakunnel, M. Gordon, K. Hayden, J. R. Brook, M. Wolde, and S.-M. Li
Atmos. Meas. Tech., 8, 5189–5211, https://doi.org/10.5194/amt-8-5189-2015, https://doi.org/10.5194/amt-8-5189-2015, 2015
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This study provides direct validations of Tropospheric Emission Spectrometer (TES) satellite retrieved profiles against coincident aircraft profiles of carbon monoxide, ammonia, methanol, and formic acid, all of which are of interest for air quality. The comparisons are performed over the Canadian oil sands region during an intensive field campaign in support of the Joint Canada-Alberta Implementation Plan for the Oil Sands Monitoring (JOSM). Initial model evaluations are also provided.
Y. Liu, J. Liggio, R. Staebler, and S.-M. Li
Atmos. Chem. Phys., 15, 13569–13584, https://doi.org/10.5194/acp-15-13569-2015, https://doi.org/10.5194/acp-15-13569-2015, 2015
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This work for the first time demonstrated that organonitrogen compounds (NOC) can be formed efficiently via the uptake of ammonia by newly formed secondary organic aerosol using a smog chamber equipped with a HR-ToF-AMS. Based on the measured kinetics, this study suggests that light absorption by NOC in atmospheric particles may be important in regions where the BC contribution is minimal and NOC from ammonia should be considered with respect to overall deposition of nitrogen to ecosystems.
N. D. Rider, Y. M. Taha, C. A. Odame-Ankrah, J. A. Huo, T. W. Tokarek, E. Cairns, S. G. Moussa, J. Liggio, and H. D. Osthoff
Atmos. Meas. Tech., 8, 2737–2748, https://doi.org/10.5194/amt-8-2737-2015, https://doi.org/10.5194/amt-8-2737-2015, 2015
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A photochemical source of peroxycarboxylic nitric anhydrides (PANs) in which a dialkyl ketone (acetone, diethyl-, di-isopropyl, or di-n-propyl ketone) in the presence of oxygen and nitric oxide is photodissociated by arrays of ultraviolet light-emitting diodes (UV-LEDs) is described. The source output was analyzed by gas chromatography and thermal dissociation cavity ring-down spectroscopy and modeled using the Master Chemical Mechanism.
G. Snider, C. L. Weagle, R. V. Martin, A. van Donkelaar, K. Conrad, D. Cunningham, C. Gordon, M. Zwicker, C. Akoshile, P. Artaxo, N. X. Anh, J. Brook, J. Dong, R. M. Garland, R. Greenwald, D. Griffith, K. He, B. N. Holben, R. Kahn, I. Koren, N. Lagrosas, P. Lestari, Z. Ma, J. Vanderlei Martins, E. J. Quel, Y. Rudich, A. Salam, S. N. Tripathi, C. Yu, Q. Zhang, Y. Zhang, M. Brauer, A. Cohen, M. D. Gibson, and Y. Liu
Atmos. Meas. Tech., 8, 505–521, https://doi.org/10.5194/amt-8-505-2015, https://doi.org/10.5194/amt-8-505-2015, 2015
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We have initiated a global network of ground-level monitoring stations to measure concentrations of fine aerosols in urban environments. Our findings include major ions species, total mass, and total scatter at three wavelengths. Results will be used to further evaluate and enhance satellite remote sensing estimates.
L. Huang, S. L. Gong, M. Gordon, J. Liggio, R. Staebler, C. A. Stroud, G. Lu, C. Mihele, J. R. Brook, and C. Q. Jia
Atmos. Chem. Phys., 14, 12631–12648, https://doi.org/10.5194/acp-14-12631-2014, https://doi.org/10.5194/acp-14-12631-2014, 2014
Y. Liu, L. Huang, S.-M. Li, T. Harner, and J. Liggio
Atmos. Chem. Phys., 14, 12195–12207, https://doi.org/10.5194/acp-14-12195-2014, https://doi.org/10.5194/acp-14-12195-2014, 2014
Y. Liu, S.-M. Li, and J. Liggio
Atmos. Chem. Phys., 14, 9201–9211, https://doi.org/10.5194/acp-14-9201-2014, https://doi.org/10.5194/acp-14-9201-2014, 2014
M. Gordon, A. Vlasenko, R. M. Staebler, C. Stroud, P. A. Makar, J. Liggio, S.-M. Li, and S. Brown
Atmos. Chem. Phys., 14, 9087–9097, https://doi.org/10.5194/acp-14-9087-2014, https://doi.org/10.5194/acp-14-9087-2014, 2014
M. L. McGuire, R. Y.-W. Chang, J. G. Slowik, C.-H. Jeong, R. M. Healy, G. Lu, C. Mihele, J. P. D. Abbatt, J. R. Brook, and G. J. Evans
Atmos. Chem. Phys., 14, 8017–8042, https://doi.org/10.5194/acp-14-8017-2014, https://doi.org/10.5194/acp-14-8017-2014, 2014
I. Levy, C. Mihele, G. Lu, J. Narayan, N. Hilker, and J. R. Brook
Atmos. Chem. Phys., 14, 7173–7193, https://doi.org/10.5194/acp-14-7173-2014, https://doi.org/10.5194/acp-14-7173-2014, 2014
D. Mendolia, R. J. C. D'Souza, G. J. Evans, and J. Brook
Atmos. Meas. Tech., 6, 2907–2924, https://doi.org/10.5194/amt-6-2907-2013, https://doi.org/10.5194/amt-6-2907-2013, 2013
J. R. Brook, P. A. Makar, D. M. L. Sills, K. L. Hayden, and R. McLaren
Atmos. Chem. Phys., 13, 10461–10482, https://doi.org/10.5194/acp-13-10461-2013, https://doi.org/10.5194/acp-13-10461-2013, 2013
L. Ahlm, K. M. Shakya, L. M. Russell, J. C. Schroder, J. P. S. Wong, S. J. Sjostedt, K. L. Hayden, J. Liggio, J. J. B. Wentzell, H. A. Wiebe, C. Mihele, W. R. Leaitch, and A. M. Macdonald
Atmos. Chem. Phys., 13, 3393–3407, https://doi.org/10.5194/acp-13-3393-2013, https://doi.org/10.5194/acp-13-3393-2013, 2013
J. Liggio and S.-M. Li
Atmos. Chem. Phys., 13, 2989–3002, https://doi.org/10.5194/acp-13-2989-2013, https://doi.org/10.5194/acp-13-2989-2013, 2013
Related subject area
Subject: Gases | Research Activity: Field Measurements | Altitude Range: Troposphere | Science Focus: Chemistry (chemical composition and reactions)
Spatiotemporal variations in atmospheric CH4 concentrations and enhancements in northern China based on a comprehensive dataset: ground-based observations, TROPOMI data, inventory data, and inversions
Marine emissions and trade winds control the atmospheric nitrous oxide in the Galapagos Islands
Measurement report: A complex street-level air quality observation campaign in a heavy-traffic area utilizing the multivariate adaptive regression splines method for field calibration of low-cost sensors
The impact of organic nitrates on summer ozone formation in Shanghai, China
Differences in the key volatile organic compound species between their emitted and ambient concentrations in ozone formation
Mechanistic insights into chloroacetic acid production from atmospheric multiphase volatile organic compound–chlorine chemistry
Accurate elucidation of oxidation under heavy ozone pollution: a full suite of radical measurements in the chemically complex atmosphere
Carbonyl compounds from typical combustion sources: emission characteristics, influencing factors, and their contribution to ozone formation
Emissions of intermediate-volatility and semi-volatile organic compounds (I/SVOCs) from different cumulative-mileage diesel vehicles at various ambient temperatures
Characterization of nitrous acid and its potential effects on secondary pollution in the warm season in Beijing urban areas
Vertical changes in volatile organic compounds (VOCs) and impacts on photochemical ozone formation
Diurnal, seasonal, and interannual variations in δ(18O) of atmospheric O2 and its application to evaluate natural and anthropogenic changes in oxygen, carbon, and water cycles
Cloud processing of dimethyl sulfide (DMS) oxidation products limits sulfur dioxide (SO2) and carbonyl sulfide (OCS) production in the eastern North Atlantic marine boundary layer
Atmospheric carbonyl compounds are crucial in regional ozone heavy pollution: insights from the Chengdu Plain Urban Agglomeration, China
Understanding summertime peroxyacetyl nitrate (PAN) formation and its relation to aerosol pollution: insights from high-resolution measurements and modeling
Measurement report: Exploring the variations in ambient BTEX in urban Europe and their environmental health implications
Seasonal air concentration variability, gas–particle partitioning, precipitation scavenging, and air–water equilibrium of organophosphate esters in southern Canada
Global Ground-based Tropospheric Ozone Measurements: Reference Data and Individual Site Trends (2000–2022) from the TOAR-II/HEGIFTOM Project
Measurement report: Surface exchange fluxes of HONO during the growth process of paddy fields in the Huaihe River Basin, China
Hemispheric differences in ozone across the stratosphere-troposphere exchange region
Molecular and seasonal characteristics of organic vapors in urban Beijing: insights from Vocus-PTR measurements
The variations in volatile organic compounds based on the policy change for Omicron in the traffic hub of Zhengzhou
On the dynamics of ozone depletion events at Villum Research Station in the High Arctic
VOC sources and impacts at an urban Mediterranean area (Marseille – France)
Measurement report: Long-term measurements of surface ozone and trends in semi-natural sub-Saharan African ecosystems
Characterization of biogenic volatile organic compounds and their oxidation products in a stressed spruce-dominated forest close to a biogas power plant
Reactive chlorine-, sulfur-, and nitrogen-containing volatile organic compounds impact atmospheric chemistry in the megacity of Delhi during both clean and extremely polluted seasons
Analysis of the day-to-day variability of ozone vertical profiles in the lower troposphere during the 2022 Paris ACROSS campaign
Significant influence of oxygenated volatile organic compounds on atmospheric chemistry analysis: A case study in a typical industrial city in China
Short lifetimes of organic nitrates in a sub-urban temperate forest indicate efficient assimilation of reactive nitrogen by the biosphere
Ozone deposition measurements over wheat fields in the North China Plain: variability and related factors of deposition flux and velocity
Consistency evaluation of tropospheric ozone from ozonesonde and IAGOS (In-service Aircraft for a Global Observing System) observations: vertical distribution, ozonesonde types, and station–airport distance
CO2 and CO temporal variability over Mexico City from ground-based total column and surface measurements
Investigating carbonyl compounds above the Amazon rainforest using a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) with NO+ chemical ionization
Measurement report: In-flight and ground-based measurements of nitrogen oxide emissions from latest-generation jet engines and 100 % sustainable aviation fuel
Observation and modelling of atmospheric OH and HO2 radicals at a subtropical rural site and implications for secondary pollutants
Measurement report: Sources, sinks, and lifetime of NOx in a suburban temperate forest at night
Measurement report: Urban ammonia and amines in Houston, Texas
Biomass-burning sources control ambient particulate matter, but traffic and industrial sources control volatile organic compound (VOC) emissions and secondary-pollutant formation during extreme pollution events in Delhi
Multi-year observations of variable incomplete combustion in the New York megacity
Observations of the vertical distributions of summertime atmospheric pollutants in Nam Co: OH production and source analysis
Measurement report: Elevated atmospheric ammonia may promote particle pH and HONO formation – insights from the COVID-19 pandemic
Measurement report: Vertical and temporal variability in the near-surface ozone production rate and sensitivity in an urban area in the Pearl River Delta region, China
Elevated oxidized mercury in the free troposphere: analytical advances and application at a remote continental mountaintop site
Using observed urban NOx sinks to constrain VOC reactivity and the ozone and radical budget in the Seoul Metropolitan Area
Real-world emission characteristics of VOCs from typical cargo ships and their potential contributions to secondary organic aerosol and O3 under low-sulfur fuel policies
NO3 reactivity during a summer period in a temperate forest below and above the canopy
The role of oceanic ventilation and terrestrial outflow in atmospheric non-methane hydrocarbons over the Chinese marginal seas
Concentration and source changes of nitrous acid (HONO) during the COVID-19 lockdown in Beijing
Characteristics and sources of nonmethane volatile organic compounds (NMVOCs) and O3–NOx–NMVOC relationships in Zhengzhou, China
Pengfei Han, Ning Zeng, Bo Yao, Wen Zhang, Weijun Quan, Pucai Wang, Ting Wang, Minqiang Zhou, Qixiang Cai, Yuzhong Zhang, Ruosi Liang, Wanqi Sun, and Shengxiang Liu
Atmos. Chem. Phys., 25, 4965–4988, https://doi.org/10.5194/acp-25-4965-2025, https://doi.org/10.5194/acp-25-4965-2025, 2025
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Methane (CH4) is a potent greenhouse gas. Northern China contributes a large proportion of CH4 emissions, yet large observation gaps exist. Here we compiled a comprehensive dataset, which is publicly available, that includes ground-based, satellite-based, inventory, and modeling results to show the CH4 concentrations, enhancements, and spatial–temporal variations. The data can benefit the research community and policy-makers for future observations, atmospheric inversions, and policy-making.
Timur Cinay, Dickon Young, Nazaret Narváez Jimenez, Cristina Vintimilla-Palacios, Ariel Pila Alonso, Paul B. Krummel, William Vizuete, and Andrew R. Babbin
Atmos. Chem. Phys., 25, 4703–4718, https://doi.org/10.5194/acp-25-4703-2025, https://doi.org/10.5194/acp-25-4703-2025, 2025
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We present the initial 15 months of nitrous oxide measurements from the Galapagos Emissions Monitoring Station. The observed variability in atmospheric mole fractions during this period can be linked to several factors: seasonal variations in trade wind speed and direction across the eastern Pacific, differences in the transport history of air masses sampled, and spatiotemporal heterogeneity in regional marine nitrous oxide emissions from the coastal upwelling systems of Peru and Chile.
Petra Bauerová, Josef Keder, Adriana Šindelářová, Ondřej Vlček, William Patiño, Pavel Krč, Jan Geletič, Hynek Řezníček, Martin Bureš, Kryštof Eben, Michal Belda, Jelena Radović, Vladimír Fuka, Radek Jareš, Igor Esau, and Jaroslav Resler
Atmos. Chem. Phys., 25, 4477–4504, https://doi.org/10.5194/acp-25-4477-2025, https://doi.org/10.5194/acp-25-4477-2025, 2025
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The study explored urban air quality in Prague using low-cost sensors and highlighted the multivariate adaptive regression splines (MARS) correction method's effectiveness in enhancing accuracy. Results showed traffic's impact on nitrogen dioxide levels and atmospheric dynamics on particulate matter. The research confirmed MARS-corrected sensors as cost-effective for monitoring, despite challenges like sensor ageing and data quality control.
Chunmeng Li, Xiaorui Chen, Haichao Wang, Tianyu Zhai, Xuefei Ma, Xinping Yang, Shiyi Chen, Min Zhou, Shengrong Lou, Xin Li, Limin Zeng, and Keding Lu
Atmos. Chem. Phys., 25, 3905–3918, https://doi.org/10.5194/acp-25-3905-2025, https://doi.org/10.5194/acp-25-3905-2025, 2025
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This study reports an observation of organic nitrate (including total peroxy nitrates and total alkyl nitrates) in Shanghai, China, during the summer of 2021, by homemade thermal dissociation cavity-enhanced absorption spectroscopy (TD-CEAS; Atmos. Meas. Tech., 14, 4033–4051, 2021). The distribution of organic nitrates and their effects on local ozone production are analyzed based on field observations in conjunction with model simulations.
Xudong Zheng and Shaodong Xie
Atmos. Chem. Phys., 25, 3807–3820, https://doi.org/10.5194/acp-25-3807-2025, https://doi.org/10.5194/acp-25-3807-2025, 2025
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To reduce uncertainties in identifying the key volatile organic compounds (VOCs) in ozone (O3) formation from ambient concentrations, this study comprehensively calculates the emitted VOC concentrations during both nighttime and daytime using the nitrate radical, O3, and hydroxyl radical reaction rates and ambient VOC concentrations. Based on the emitted concentrations, isoprene is one of the top three species contributing to O3 formation, which may be overlooked in observed concentrations.
Mingxue Li, Men Xia, Chunshui Lin, Yifan Jiang, Weihang Sun, Yurun Wang, Yingnan Zhang, Maoxia He, and Tao Wang
Atmos. Chem. Phys., 25, 3753–3764, https://doi.org/10.5194/acp-25-3753-2025, https://doi.org/10.5194/acp-25-3753-2025, 2025
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Our field campaigns observed a strong diel pattern of chloroacetic acid as well as a strong correlation between its level and that of reactive chlorine species at a coastal site. Using quantum chemical calculations and box model simulation with an updated Master Chemical Mechanism, we found that the formation pathway of chloroacetic acid involved multiphase processes. Our study enhances understanding of atmospheric organic chlorine chemistry and emphasizes the importance of multiphase reactions.
Renzhi Hu, Guoxian Zhang, Haotian Cai, Jingyi Guo, Keding Lu, Xin Li, Shengrong Lou, Zhaofeng Tan, Changjin Hu, Pinhua Xie, and Wenqing Liu
Atmos. Chem. Phys., 25, 3011–3028, https://doi.org/10.5194/acp-25-3011-2025, https://doi.org/10.5194/acp-25-3011-2025, 2025
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A full suite of radical measurements (OH, HO2, RO2, and kOH) was established to accurately elucidate the limitations of oxidation in a chemically complex atmosphere. Sensitivity tests revealed that the incorporation of complex processes enabled a balance in both radical concentrations and coordinate ratios, effectively addressing the deficiency in the ozone generation mechanism. The full-chain radical detection bridged the gap between the photochemistry and the intensive oxidation level.
Yanjie Lu, Xinxin Feng, Yanli Feng, Minjun Jiang, Yu Peng, Tian Chen, and Yingjun Chen
EGUsphere, https://doi.org/10.5194/egusphere-2025-131, https://doi.org/10.5194/egusphere-2025-131, 2025
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The EFs of CCs from biomass burning (BB) is an order of magnitude higher than that from on-road sources. Fuel type determines the emission characteristics and composition of CCs. The formation of CCs from solid and liquid fuel sources is respectively controlled by combustion temperature and emission standards. In addition, biomass burning and agricultural machinery sources significantly contribute to the oxidizing capacity of regional atmospheres.
Shuwen Guo, Xuan Zheng, Xiao He, Lewei Zeng, Liqiang He, Xian Wu, Yifei Dai, Zihao Huang, Ting Chen, Shupei Xiao, Yan You, Sheng Xiang, Shaojun Zhang, Jingkun Jiang, and Ye Wu
Atmos. Chem. Phys., 25, 2695–2705, https://doi.org/10.5194/acp-25-2695-2025, https://doi.org/10.5194/acp-25-2695-2025, 2025
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We considered two potential influencing factors of heavy-duty diesel vehicle emissions that are rarely mentioned in the literature: cumulative mileage and ambient temperatures. The results suggest that prolonged use of heavy-duty diesel vehicles and low ambient temperatures leads to reduced engine combustion efficiency, which in turn increases tailpipe emissions significantly.
Junling Li, Chaofan Lian, Mingyuan Liu, Hao Zhang, Yongxin Yan, Yufei Song, Chun Chen, Jiaqi Wang, Haijie Zhang, Yanqin Ren, Yucong Guo, Weigang Wang, Yisheng Xu, Hong Li, Jian Gao, and Maofa Ge
Atmos. Chem. Phys., 25, 2551–2568, https://doi.org/10.5194/acp-25-2551-2025, https://doi.org/10.5194/acp-25-2551-2025, 2025
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As a key source of hydroxyl (OH) radical, nitrous acid (HONO) has attracted much attention for its important role in the atmospheric oxidant capacity (AOC) increase. In this study, we made a comparison of the ambient levels, variation patterns, sources, and formation pathway in the warm season on the basis of continuous intensive observations at an urban site of Beijing. This work highlights the importance of HONO for the AOC in the warm season.
Xiao-Bing Li, Bin Yuan, Yibo Huangfu, Suxia Yang, Xin Song, Jipeng Qi, Xianjun He, Sihang Wang, Yubin Chen, Qing Yang, Yongxin Song, Yuwen Peng, Guiqian Tang, Jian Gao, Dasa Gu, and Min Shao
Atmos. Chem. Phys., 25, 2459–2472, https://doi.org/10.5194/acp-25-2459-2025, https://doi.org/10.5194/acp-25-2459-2025, 2025
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Online vertical gradient measurements of volatile organic compounds (VOCs), ozone, and NOx were conducted based on a 325 m tall tower in urban Beijing. Vertical changes in the concentrations, compositions, key drivers, and environmental impacts of VOCs were analyzed in this study. We find that VOC species display differentiated vertical variation patterns and distinct roles in contributing to photochemical ozone formation with increasing height in the urban planetary boundary layer.
Shigeyuki Ishidoya, Satoshi Sugawara, and Atsushi Okazaki
Atmos. Chem. Phys., 25, 1965–1987, https://doi.org/10.5194/acp-25-1965-2025, https://doi.org/10.5194/acp-25-1965-2025, 2025
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The 18O/16O ratio of atmospheric oxygen, δatm(18O), is higher than that of ocean water due to isotopic effects during biospheric activities. This is known as the Dole–Morita effect, and its millennial-scale variations are recorded in ice cores. However, small variations of δatm(18O) in the present day have never been detected so far. This paper presents the first observations of diurnal, seasonal, and secular variations in δatm(18O) and applies them to evaluate oxygen, carbon, and water cycles.
Delaney B. Kilgour, Christopher M. Jernigan, Olga Garmash, Sneha Aggarwal, Shengqian Zhou, Claudia Mohr, Matt E. Salter, Joel A. Thornton, Jian Wang, Paul Zieger, and Timothy H. Bertram
Atmos. Chem. Phys., 25, 1931–1947, https://doi.org/10.5194/acp-25-1931-2025, https://doi.org/10.5194/acp-25-1931-2025, 2025
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We report simultaneous measurements of dimethyl sulfide (DMS) and hydroperoxymethyl thioformate (HPMTF) in the eastern North Atlantic. We use an observationally constrained box model to show that cloud loss is the dominant sink of HPMTF in this region over 6 weeks, resulting in large reductions in DMS-derived products that contribute to aerosol formation and growth. Our findings indicate that fast cloud processing of HPMTF must be included in global models to accurately capture the sulfur cycle.
Jiemeng Bao, Xin Zhang, Zhenhai Wu, Li Zhou, Jun Qian, Qinwen Tan, Fumo Yang, Junhui Chen, Yunfeng Li, Hefan Liu, Liqun Deng, and Hong Li
Atmos. Chem. Phys., 25, 1899–1916, https://doi.org/10.5194/acp-25-1899-2025, https://doi.org/10.5194/acp-25-1899-2025, 2025
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We studied carbonyl compounds' role in ozone pollution in the Chengdu Plain Urban Agglomeration, China. During heavy pollution in August 2019, we measured carbonyls at nine sites and analyzed their impact. Areas with higher carbonyl levels, like Chengdu, had worse ozone pollution. While their abundance matters, chemical reactions with other pollutants are the main drivers. Our findings show regional cooperation is vital to reducing ozone pollution effectively.
Baoye Hu, Naihua Chen, Rui Li, Mingqiang Huang, Jinsheng Chen, Youwei Hong, Lingling Xu, Xiaolong Fan, Mengren Li, Lei Tong, Qiuping Zheng, and Yuxiang Yang
Atmos. Chem. Phys., 25, 905–921, https://doi.org/10.5194/acp-25-905-2025, https://doi.org/10.5194/acp-25-905-2025, 2025
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Box modeling with the Master Chemical Mechanism (MCM) was used to explore summertime peroxyacetyl nitrate (PAN) formation and its link to aerosol pollution under high-ozone conditions. The MCM model is effective in the study of PAN photochemical formation and performed better during the clean period than the haze period. Machine learning analysis identified ammonia, nitrate, and fine particulate matter as the top three factors contributing to simulation bias.
Xiansheng Liu, Xun Zhang, Marvin Dufresne, Tao Wang, Lijie Wu, Rosa Lara, Roger Seco, Marta Monge, Ana Maria Yáñez-Serrano, Marie Gohy, Paul Petit, Audrey Chevalier, Marie-Pierre Vagnot, Yann Fortier, Alexia Baudic, Véronique Ghersi, Grégory Gille, Ludovic Lanzi, Valérie Gros, Leïla Simon, Heidi Héllen, Stefan Reimann, Zoé Le Bras, Michelle Jessy Müller, David Beddows, Siqi Hou, Zongbo Shi, Roy M. Harrison, William Bloss, James Dernie, Stéphane Sauvage, Philip K. Hopke, Xiaoli Duan, Taicheng An, Alastair C. Lewis, James R. Hopkins, Eleni Liakakou, Nikolaos Mihalopoulos, Xiaohu Zhang, Andrés Alastuey, Xavier Querol, and Thérèse Salameh
Atmos. Chem. Phys., 25, 625–638, https://doi.org/10.5194/acp-25-625-2025, https://doi.org/10.5194/acp-25-625-2025, 2025
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This study examines BTEX (benzene, toluene, ethylbenzene, xylenes) pollution in urban areas across seven European countries. Analyzing data from 22 monitoring sites, we found traffic and industrial activities significantly impact BTEX levels, with peaks during rush hours. The risk from BTEX exposure remains moderate, especially in high-traffic and industrial zones, highlighting the need for targeted air quality management to protect public health and improve urban air quality.
Yuening Li, Faqiang Zhan, Chubashini Shunthirasingham, Ying Duan Lei, Jenny Oh, Amina Ben Chaaben, Zhe Lu, Kelsey Lee, Frank A. P. C. Gobas, Hayley Hung, and Frank Wania
Atmos. Chem. Phys., 25, 459–472, https://doi.org/10.5194/acp-25-459-2025, https://doi.org/10.5194/acp-25-459-2025, 2025
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Organophosphate esters are important humanmade trace contaminants. Measuring them in the atmospheric gas phase, particles, precipitation, and surface water in Canada, we explore seasonal concentration variability, gas–particle partitioning, precipitation scavenging, and the air–water equilibrium. Whereas higher summer concentrations and efficient precipitation scavenging conform with expectations, the lack of a relationship between compound volatility and gas–particle partitioning is puzzling.
Roeland Van Malderen, Anne M. Thompson, Debra E. Kollonige, Ryan M. Stauffer, Herman G. J. Smit, Eliane Maillard Barras, Corinne Vigouroux, Irina Petropavlovskikh, Thierry Leblanc, Valérie Thouret, Pawel Wolff, Peter Effertz, David W. Tarasick, Deniz Poyraz, Gérard Ancellet, Marie-Renée De Backer, Stéphanie Evan, Victoria Flood, Matthias M. Frey, James W. Hannigan, José L. Hernandez, Marco Iarlori, Bryan J. Johnson, Nicholas Jones, Rigel Kivi, Emmanuel Mahieu, Glen McConville, Katrin Müller, Tomoo Nagahama, Justus Notholt, Ankie Piters, Natalia Prats, Richard Querel, Dan Smale, Wolfgang Steinbrecht, Kimberly Strong, and Ralf Sussmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-3736, https://doi.org/10.5194/egusphere-2024-3736, 2025
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Tropospheric ozone is an important greenhouse gas and is an air pollutant. The time variability of tropospheric ozone is mainly driven by anthropogenic emissions. In this paper, we study the distribution and time variability of ozone from harmonized ground-based observations from five different measurement techniques. Our findings will provide clear standard references for atmospheric models and evolving tropospheric ozone satellite data for the 2000–2022 period.
Fanhao Meng, Baobin Han, Min Qin, Wu Fang, Ke Tang, Dou Shao, Zhitang Liao, Jun Duan, Yan Feng, Yong Huang, Ting Ni, and Pinhua Xie
Atmos. Chem. Phys., 24, 14191–14208, https://doi.org/10.5194/acp-24-14191-2024, https://doi.org/10.5194/acp-24-14191-2024, 2024
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Comprehensive observations of HONO and NOx fluxes were conducted over paddy fields in the Huaihe River Basin. Consecutive peaks in HONO and NO fluxes suggest a potentially enhanced release of HONO and NO due to soil tillage, whereas waterlogged soil may inhibit microbial nitrification processes following irrigation. Notably, biological processes and light-driven NO2 reactions at the surface may serve as sources of HONO and influence the local HONO budget during rotary tillage.
Rodrigo J. Seguel, Charlie Opazo, Yann Cohen, Owen R. Cooper, Laura Gallardo, Björn-Martin Sinnhuber, Florian Obersteiner, Andreas Zahn, Peter Hoor, and Susanne Rohs
EGUsphere, https://doi.org/10.5194/egusphere-2024-3719, https://doi.org/10.5194/egusphere-2024-3719, 2024
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We explored differences in ozone levels between the Northern and Southern Hemispheres in the Stratosphere-troposphere exchange region. Using unique data from a research aircraft, we found significantly lower ozone levels (with stratospheric character) in the Southern Hemisphere, especially during years of severe ozone depletion. A Sudden Stratospheric Warming event in 2019 increased Southern Hemisphere ozone levels, highlighting the relationship between atmospheric events and ozone distribution.
Zhaojin An, Rujing Yin, Xinyan Zhao, Xiaoxiao Li, Yuyang Li, Yi Yuan, Junchen Guo, Yiqi Zhao, Xue Li, Dandan Li, Yaowei Li, Dongbin Wang, Chao Yan, Kebin He, Douglas R. Worsnop, Frank N. Keutsch, and Jingkun Jiang
Atmos. Chem. Phys., 24, 13793–13810, https://doi.org/10.5194/acp-24-13793-2024, https://doi.org/10.5194/acp-24-13793-2024, 2024
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Online Vocus-PTR measurements show the compositions and seasonal variations in organic vapors in urban Beijing. With enhanced sensitivity and mass resolution, various species at a level of sub-parts per trillion (ppt) and organics with multiple oxygens (≥ 3) were observed. The fast photooxidation process in summer leads to an increase in both concentration and proportion of organics with multiple oxygens, while, in other seasons, the variations in them could be influenced by mixed sources.
Bowen Zhang, Dong Zhang, Zhe Dong, Xinshuai Song, Ruiqin Zhang, and Xiao Li
Atmos. Chem. Phys., 24, 13587–13601, https://doi.org/10.5194/acp-24-13587-2024, https://doi.org/10.5194/acp-24-13587-2024, 2024
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To gain insight into the impact of changes due to epidemic control policies, we undertook continuous online monitoring of volatile organic compounds (VOCs) at an urban site in Zhengzhou over a 2-month period. This study examines the characteristics of VOCs, their sources, and their temporal evolution. It also assesses the impact of the policy change on VOC pollution during the monitoring period, thus providing a basis for further research on VOC pollution and source control.
Jakob Boyd Pernov, Jens Liengaard Hjorth, Lise Lotte Sørensen, and Henrik Skov
Atmos. Chem. Phys., 24, 13603–13631, https://doi.org/10.5194/acp-24-13603-2024, https://doi.org/10.5194/acp-24-13603-2024, 2024
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Arctic ozone depletion events (ODEs) occur every spring and have vast implications for the oxidizing capacity, radiative balance, and mercury oxidation. In this study, we analyze ozone, ODEs, and their connection to meteorological and air mass history variables through statistical analyses, back trajectories, and machine learning (ML) at Villum Research Station. ODEs are favorable under sunny, calm conditions with air masses arriving from northerly wind directions with sea ice contact.
Marvin Dufresne, Thérèse Salameh, Thierry Léonardis, Grégory Gille, Alexandre Armengaud, and Stéphane Sauvage
EGUsphere, https://doi.org/10.5194/egusphere-2024-3576, https://doi.org/10.5194/egusphere-2024-3576, 2024
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This paper is about the eighteen-months measurement of Non-Methane Hydrocarbons (NMHC) at Marseille, were there was no measurement since early 2000 despite the impact of NMHC on air quality and climate. The traffic related sources are the first contributor to NMHC concentrations in Marseille and shipping strongly contribute to the formation of aerosols. Finally, the lockdown due to the Covid-19 had an impact on NMHC concentrations reaching a fifty percents decreasing for traffic-related sources.
Hagninou Elagnon Venance Donnou, Aristide Barthélémy Akpo, Money Ossohou, Claire Delon, Véronique Yoboué, Dungall Laouali, Marie Ouafo-Leumbe, Pieter Gideon Van Zyl, Ousmane Ndiaye, Eric Gardrat, Maria Dias-Alves, and Corinne Galy-Lacaux
Atmos. Chem. Phys., 24, 13151–13182, https://doi.org/10.5194/acp-24-13151-2024, https://doi.org/10.5194/acp-24-13151-2024, 2024
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Ozone is a secondary air pollutant that is detrimental to human and plant health. A better understanding of its chemical evolution is a challenge for Africa, where it is still undersampled. Out of 14 sites examined (1995–2020), high levels of O3 are reported in southern Africa. The dominant chemical processes leading to O3 formation are identified. A decrease in O3 is observed at Katibougou (Mali) and Banizoumbou (Niger), and an increase is found at Zoétélé (Cameroon) and Skukuza (South Africa).
Junwei Song, Georgios I. Gkatzelis, Ralf Tillmann, Nicolas Brüggemann, Thomas Leisner, and Harald Saathoff
Atmos. Chem. Phys., 24, 13199–13217, https://doi.org/10.5194/acp-24-13199-2024, https://doi.org/10.5194/acp-24-13199-2024, 2024
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Biogenic volatile organic compounds (BVOCs) and organic aerosol (OA) particles were measured online in a stressed spruce-dominated forest. OA was mainly attributed to the monoterpene oxidation products. The mixing ratios of BVOCs were higher than the values previously measured in other temperate forests. The results demonstrate that BVOCs are influenced not only by meteorology and biogenic emissions but also by local anthropogenic emissions and subsequent chemical transformation processes.
Sachin Mishra, Vinayak Sinha, Haseeb Hakkim, Arpit Awasthi, Sachin D. Ghude, Vijay Kumar Soni, Narendra Nigam, Baerbel Sinha, and Madhavan N. Rajeevan
Atmos. Chem. Phys., 24, 13129–13150, https://doi.org/10.5194/acp-24-13129-2024, https://doi.org/10.5194/acp-24-13129-2024, 2024
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We quantified 111 gases using mass spectrometry to understand how seasonal and emission changes lead from clean air in the monsoon season to extremely polluted air in the post-monsoon season in Delhi. Averaged total mass concentrations (260 µg m-3) were > 4 times in polluted periods, driven by biomass burning emissions and reduced atmospheric ventilation. Reactive gaseous nitrogen, chlorine, and sulfur compounds hitherto unreported from such a polluted environment were discovered.
Gérard Ancellet, Camille Viatte, Anne Boynard, François Ravetta, Jacques Pelon, Cristelle Cailteau-Fischbach, Pascal Genau, Julie Capo, Axel Roy, and Philippe Nédélec
Atmos. Chem. Phys., 24, 12963–12983, https://doi.org/10.5194/acp-24-12963-2024, https://doi.org/10.5194/acp-24-12963-2024, 2024
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Characterization of ozone pollution in urban areas benefited from a measurement campaign in summer 2022 in the Paris region. The analysis is based on 21 d of lidar and aircraft observations. The main objective is an analysis of the sensitivity of ozone pollution to the micrometeorological processes in the urban atmospheric boundary layer and the transport of regional pollution. The paper also discusses to what extent satellite observations can track observed ozone plumes.
Jingwen Dai, Kun Zhang, Yanli Feng, Xin Yi, Rui Li, Jin Xue, Qing Li, Lishu Shi, Jiaqiang Liao, Yanan Yi, Fangting Wang, Liumei Yang, Hui Chen, Ling Huang, Jiani Tan, Yangjun Wang, and Li Li
EGUsphere, https://doi.org/10.5194/egusphere-2024-3201, https://doi.org/10.5194/egusphere-2024-3201, 2024
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Oxygenated volatile organic compounds (OVOCs) are important ozone (O3) precursors. However, most of O3 formation analysis based on the box model (OBM) don't include OVOCs constraint To access the interference of OVOCs on O3 simulation, this study conducted field campaign and OBM analysis. The results indicates that no OVOCs constraint in the OBM can lead to overestimate of OVOCs, free radicals, and O3.
Simone T. Andersen, Rolf Sander, Patrick Dewald, Laura Wüst, Tobias Seubert, Gunther N. T. E. Türk, Jan Schuladen, Max R. McGillen, Chaoyang Xue, Abdelwahid Mellouki, Alexandre Kukui, Vincent Michoud, Manuela Cirtog, Mathieu Cazaunau, Astrid Bauville, Hichem Bouzidi, Paola Formenti, Cyrielle Denjean, Jean-Claude Etienne, Olivier Garrouste, Christopher Cantrell, Jos Lelieveld, and John N. Crowley
EGUsphere, https://doi.org/10.5194/egusphere-2024-3437, https://doi.org/10.5194/egusphere-2024-3437, 2024
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Measurements and modelling of reactive nitrogen gases observed in a suburban temperate forest in Rambouillet, France circa 50 km southwest of Paris in 2022 indicate that the biosphere rapidly scavenges organic nitrates of mixed biogenic and anthropogenic origin, resulting in short lifetimes for e.g. alkyl nitrates and peroxy nitrates.
Xiaoyi Zhang, Wanyun Xu, Weili Lin, Gen Zhang, Jinjian Geng, Li Zhou, Huarong Zhao, Sanxue Ren, Guangsheng Zhou, Jianmin Chen, and Xiaobin Xu
Atmos. Chem. Phys., 24, 12323–12340, https://doi.org/10.5194/acp-24-12323-2024, https://doi.org/10.5194/acp-24-12323-2024, 2024
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Ozone (O3) deposition is a key process that removes surface O3, affecting air quality, ecosystems and climate change. We conducted O3 deposition measurement over a wheat canopy using a newly relaxed eddy accumulation flux system. Large variabilities in O3 deposition were detected, mainly determined by crop growth and modulated by various environmental factors. More O3 deposition observations over different surfaces are needed for exploring deposition mechanisms and model optimization.
Honglei Wang, David W. Tarasick, Jane Liu, Herman G. J. Smit, Roeland Van Malderen, Lijuan Shen, Romain Blot, and Tianliang Zhao
Atmos. Chem. Phys., 24, 11927–11942, https://doi.org/10.5194/acp-24-11927-2024, https://doi.org/10.5194/acp-24-11927-2024, 2024
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In this study, we identify 23 suitable pairs of sites from World Ozone and Ultraviolet Radiation Data Centre (WOUDC) and In-service Aircraft for a Global Observing System (IAGOS) datasets (1995 to 2021), compare the average vertical distributions of tropospheric O3 from ozonesonde and aircraft measurements, and analyze the differences based on ozonesonde type and station–airport distance.
Noémie Taquet, Wolfgang Stremme, María Eugenia González del Castillo, Victor Almanza, Alejandro Bezanilla, Olivier Laurent, Carlos Alberti, Frank Hase, Michel Ramonet, Thomas Lauvaux, Ke Che, and Michel Grutter
Atmos. Chem. Phys., 24, 11823–11848, https://doi.org/10.5194/acp-24-11823-2024, https://doi.org/10.5194/acp-24-11823-2024, 2024
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We characterize the variability in CO and CO2 emissions over Mexico City from long-term time-resolved Fourier transform infrared spectroscopy solar absorption and surface measurements from 2013 to 2021. Using the average intraday CO growth rate from total columns, the average CO / CO2 ratio and TROPOMI data, we estimate the interannual variability in the CO and CO2 anthropogenic emissions of Mexico City, highlighting the effect of an unprecedented drop in activity due to the COVID-19 lockdown.
Akima Ringsdorf, Achim Edtbauer, Bruna Holanda, Christopher Poehlker, Marta O. Sá, Alessandro Araújo, Jürgen Kesselmeier, Jos Lelieveld, and Jonathan Williams
Atmos. Chem. Phys., 24, 11883–11910, https://doi.org/10.5194/acp-24-11883-2024, https://doi.org/10.5194/acp-24-11883-2024, 2024
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We show the average height distribution of separately observed aldehydes and ketones over a day and discuss their rainforest-specific sources and sinks as well as their seasonal changes above the Amazon. Ketones have much longer atmospheric lifetimes than aldehydes and thus different implications for atmospheric chemistry. However, they are commonly observed together, which we overcome by measuring with a NO+ chemical ionization mass spectrometer for the first time in the Amazon rainforest.
Theresa Harlass, Rebecca Dischl, Stefan Kaufmann, Raphael Märkl, Daniel Sauer, Monika Scheibe, Paul Stock, Tiziana Bräuer, Andreas Dörnbrack, Anke Roiger, Hans Schlager, Ulrich Schumann, Magdalena Pühl, Tobias Schripp, Tobias Grein, Linda Bondorf, Charles Renard, Maxime Gauthier, Mark Johnson, Darren Luff, Paul Madden, Peter Swann, Denise Ahrens, Reetu Sallinen, and Christiane Voigt
Atmos. Chem. Phys., 24, 11807–11822, https://doi.org/10.5194/acp-24-11807-2024, https://doi.org/10.5194/acp-24-11807-2024, 2024
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Emissions from aircraft have a direct impact on our climate. Here, we present airborne and ground-based measurement data of nitrogen oxides that were collected in the exhaust of an Airbus aircraft. We study the impact of burning fossil and sustainable aviation fuel on nitrogen oxide emissions at different engine settings related to combustor temperature, pressure and fuel flow. Further, we compare observations with engine emission models.
Zhouxing Zou, Tianshu Chen, Qianjie Chen, Weihang Sun, Shichun Han, Zhuoyue Ren, Xinyi Li, Wei Song, Aoqi Ge, Qi Wang, Xiao Tian, Chenglei Pei, Xinming Wang, Yanli Zhang, and Tao Wang
EGUsphere, https://doi.org/10.5194/egusphere-2024-3210, https://doi.org/10.5194/egusphere-2024-3210, 2024
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We measured ambient OH and HO2 concentrations at a subtropical rural site and compared our observations with model results. During warm periods, the model overestimated the concentrations of OH and HO2, leading to overestimation of ozone and nitric acid production. Our findings highlight the need to better understand how OH and HO2are formed and removed, which is important for accurate air quality and climate predictions.
Simone T. Andersen, Max R. McGillen, Chaoyang Xue, Tobias Seubert, Patrick Dewald, Gunther N. T. E. Türk, Jan Schuladen, Cyrielle Denjean, Jean-Claude Etienne, Olivier Garrouste, Marina Jamar, Sergio Harb, Manuela Cirtog, Vincent Michoud, Mathieu Cazaunau, Antonin Bergé, Christopher Cantrell, Sebastien Dusanter, Bénédicte Picquet-Varrault, Alexandre Kukui, Abdelwahid Mellouki, Lucy J. Carpenter, Jos Lelieveld, and John N. Crowley
Atmos. Chem. Phys., 24, 11603–11618, https://doi.org/10.5194/acp-24-11603-2024, https://doi.org/10.5194/acp-24-11603-2024, 2024
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Using measurements of various trace gases in a suburban forest near Paris in the summer of 2022, we were able to gain insight into the sources and sinks of NOx (NO+NO2) with a special focus on their nighttime chemical and physical loss processes. NO was observed as a result of nighttime soil emissions when O3 levels were strongly depleted by deposition. NO oxidation products were not observed at night, indicating that soil and/or foliar surfaces are an efficient sink of reactive N.
Lee Tiszenkel, James H. Flynn, and Shan-Hu Lee
Atmos. Chem. Phys., 24, 11351–11363, https://doi.org/10.5194/acp-24-11351-2024, https://doi.org/10.5194/acp-24-11351-2024, 2024
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Ammonia and amines are important ingredients for aerosol formation in urban environments, but the measurements of these compounds are extremely challenging. Our observations show that urban ammonia and amines in Houston are emitted from urban sources, and diurnal variations in their concentrations are likely governed by gas-to-particle conversion and emissions.
Arpit Awasthi, Baerbel Sinha, Haseeb Hakkim, Sachin Mishra, Varkrishna Mummidivarapu, Gurmanjot Singh, Sachin D. Ghude, Vijay Kumar Soni, Narendra Nigam, Vinayak Sinha, and Madhavan N. Rajeevan
Atmos. Chem. Phys., 24, 10279–10304, https://doi.org/10.5194/acp-24-10279-2024, https://doi.org/10.5194/acp-24-10279-2024, 2024
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We use 111 volatile organic compounds (VOCs), PM10, and PM2.5 in a positive matrix factorization (PMF) model to resolve 11 pollution sources validated with chemical fingerprints. Crop residue burning and heating account for ~ 50 % of the PM, while traffic and industrial emissions dominate the gas-phase VOC burden and formation potential of secondary organic aerosols (> 60 %). Non-tailpipe emissions from compressed-natural-gas-fuelled commercial vehicles dominate the transport sector's PM burden.
Luke D. Schiferl, Cong Cao, Bronte Dalton, Andrew Hallward-Driemeier, Ricardo Toledo-Crow, and Róisín Commane
Atmos. Chem. Phys., 24, 10129–10142, https://doi.org/10.5194/acp-24-10129-2024, https://doi.org/10.5194/acp-24-10129-2024, 2024
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Carbon monoxide (CO) is an air pollutant and an important indicator of the incomplete combustion of fossil fuels in cities. Using 4 years of winter and spring observations in New York City, we found that both the magnitude and variability of CO from the metropolitan area are greater than expected. Transportation emissions cannot explain the missing and variable CO, which points to energy from buildings as a likely underappreciated source of urban air pollution and greenhouse gas emissions.
Chengzhi Xing, Cheng Liu, Chunxiang Ye, Jingkai Xue, Hongyu Wu, Xiangguang Ji, Jinping Ou, and Qihou Hu
Atmos. Chem. Phys., 24, 10093–10112, https://doi.org/10.5194/acp-24-10093-2024, https://doi.org/10.5194/acp-24-10093-2024, 2024
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We identified the contributions of ozone (O3) and nitrous acid (HONO) to the production rates of hydroxide (OH) in vertical space on the Tibetan Plateau (TP). A new insight was offered: the contributions of HONO and O3 to the production rates of OH on the TP are even greater than in lower-altitudes areas. This study enriches the understanding of vertical distribution of atmospheric components and explains the strong atmospheric oxidation capacity (AOC) on the TP.
Xinyuan Zhang, Lingling Wang, Nan Wang, Shuangliang Ma, Shenbo Wang, Ruiqin Zhang, Dong Zhang, Mingkai Wang, and Hongyu Zhang
Atmos. Chem. Phys., 24, 9885–9898, https://doi.org/10.5194/acp-24-9885-2024, https://doi.org/10.5194/acp-24-9885-2024, 2024
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This study highlights the importance of the redox reaction of NO2 with SO2 based on actual atmospheric observations. The particle pH in future China is expected to rise steadily. Consequently, this reaction could become a significant source of HONO in China. Therefore, it is crucial to coordinate the control of SO2, NOx, and NH3 emissions to avoid a rapid increase in the particle pH.
Jun Zhou, Chunsheng Zhang, Aiming Liu, Bin Yuan, Yan Wang, Wenjie Wang, Jie-Ping Zhou, Yixin Hao, Xiao-Bing Li, Xianjun He, Xin Song, Yubin Chen, Suxia Yang, Shuchun Yang, Yanfeng Wu, Bin Jiang, Shan Huang, Junwen Liu, Yuwen Peng, Jipeng Qi, Minhui Deng, Bowen Zhong, Yibo Huangfu, and Min Shao
Atmos. Chem. Phys., 24, 9805–9826, https://doi.org/10.5194/acp-24-9805-2024, https://doi.org/10.5194/acp-24-9805-2024, 2024
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In-depth understanding of the near-ground vertical variability in photochemical ozone (O3) formation is crucial for mitigating O3 pollution. Utilizing a self-built vertical observation system, a direct net photochemical O3 production rate detection system, and an observation-based model, we diagnosed the vertical distributions and formation mechanism of net photochemical O3 production rates and sensitivity in the Pearl River Delta region, one of the most O3-polluted areas in China.
Eleanor J. Derry, Tyler R. Elgiar, Taylor Y. Wilmot, Nicholas W. Hoch, Noah S. Hirshorn, Peter Weiss-Penzias, Christopher F. Lee, John C. Lin, A. Gannet Hallar, Rainer Volkamer, Seth N. Lyman, and Lynne E. Gratz
Atmos. Chem. Phys., 24, 9615–9643, https://doi.org/10.5194/acp-24-9615-2024, https://doi.org/10.5194/acp-24-9615-2024, 2024
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Mercury (Hg) is a globally distributed neurotoxic pollutant. Atmospheric deposition is the main source of Hg in ecosystems. However, measurement biases hinder understanding of the origins and abundance of the more bioavailable oxidized form. We used an improved, calibrated measurement system to study air mass composition and transport of atmospheric Hg at a remote mountaintop site in the central US. Oxidized Hg originated upwind in the low to middle free troposphere under clean, dry conditions.
Benjamin A. Nault, Katherine R. Travis, James H. Crawford, Donald R. Blake, Pedro Campuzano-Jost, Ronald C. Cohen, Joshua P. DiGangi, Glenn S. Diskin, Samuel R. Hall, L. Gregory Huey, Jose L. Jimenez, Kyung-Eun Min, Young Ro Lee, Isobel J. Simpson, Kirk Ullmann, and Armin Wisthaler
Atmos. Chem. Phys., 24, 9573–9595, https://doi.org/10.5194/acp-24-9573-2024, https://doi.org/10.5194/acp-24-9573-2024, 2024
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Ozone (O3) is a pollutant formed from the reactions of gases emitted from various sources. In urban areas, the density of human activities can increase the O3 formation rate (P(O3)), thus impacting air quality and health. Observations collected over Seoul, South Korea, are used to constrain P(O3). A high local P(O3) was found; however, local P(O3) was partly reduced due to compounds typically ignored. These observations also provide constraints for unmeasured compounds that will impact P(O3).
Fan Zhang, Binyu Xiao, Zeyu Liu, Yan Zhang, Chongguo Tian, Rui Li, Can Wu, Yali Lei, Si Zhang, Xinyi Wan, Yubao Chen, Yong Han, Min Cui, Cheng Huang, Hongli Wang, Yingjun Chen, and Gehui Wang
Atmos. Chem. Phys., 24, 8999–9017, https://doi.org/10.5194/acp-24-8999-2024, https://doi.org/10.5194/acp-24-8999-2024, 2024
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Mandatory use of low-sulfur fuel due to global sulfur limit regulations means large uncertainties in volatile organic compound (VOC) emissions. On-board tests of VOCs from nine cargo ships in China were carried out. Results showed that switching from heavy-fuel oil to diesel increased emission factor VOCs by 48 % on average, enhancing O3 and the secondary organic aerosol formation potential. Thus, implementing a global ultra-low-sulfur oil policy needs to be optimized in the near future.
Patrick Dewald, Tobias Seubert, Simone T. Andersen, Gunther N. T. E. Türk, Jan Schuladen, Max R. McGillen, Cyrielle Denjean, Jean-Claude Etienne, Olivier Garrouste, Marina Jamar, Sergio Harb, Manuela Cirtog, Vincent Michoud, Mathieu Cazaunau, Antonin Bergé, Christopher Cantrell, Sebastien Dusanter, Bénédicte Picquet-Varrault, Alexandre Kukui, Chaoyang Xue, Abdelwahid Mellouki, Jos Lelieveld, and John N. Crowley
Atmos. Chem. Phys., 24, 8983–8997, https://doi.org/10.5194/acp-24-8983-2024, https://doi.org/10.5194/acp-24-8983-2024, 2024
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In the scope of a field campaign in a suburban forest near Paris in the summer of 2022, we measured the reactivity of the nitrate radical NO3 towards biogenic volatile organic compounds (BVOCs; e.g. monoterpenes) mainly below but also above the canopy. NO3 reactivity was the highest during nights with strong temperature inversions and decreased strongly with height. Reactions with BVOCs were the main removal process of NO3 throughout the diel cycle below the canopy.
Jian Wang, Lei Xue, Qianyao Ma, Feng Xu, Gaobin Xu, Shibo Yan, Jiawei Zhang, Jianlong Li, Honghai Zhang, Guiling Zhang, and Zhaohui Chen
Atmos. Chem. Phys., 24, 8721–8736, https://doi.org/10.5194/acp-24-8721-2024, https://doi.org/10.5194/acp-24-8721-2024, 2024
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This study investigated the distribution and sources of non-methane hydrocarbons (NMHCs) in the lower atmosphere over the marginal seas of China. NMHCs, a subset of volatile organic compounds (VOCs), play a crucial role in atmospheric chemistry. Derived from systematic atmospheric sampling in coastal cities and marginal sea regions, this study offers valuable insights into the interaction between land and sea in shaping offshore atmospheric NMHCs.
Yusheng Zhang, Feixue Zheng, Zemin Feng, Chaofan Lian, Weigang Wang, Xiaolong Fan, Wei Ma, Zhuohui Lin, Chang Li, Gen Zhang, Chao Yan, Ying Zhang, Veli-Matti Kerminen, Federico Bianch, Tuukka Petäjä, Juha Kangasluoma, Markku Kulmala, and Yongchun Liu
Atmos. Chem. Phys., 24, 8569–8587, https://doi.org/10.5194/acp-24-8569-2024, https://doi.org/10.5194/acp-24-8569-2024, 2024
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The nitrous acid (HONO) budget was validated during a COVID-19 lockdown event. The main conclusions are (1) HONO concentrations showed a significant decrease from 0.97 to 0.53 ppb during lockdown; (2) vehicle emissions accounted for 53 % of nighttime sources, with the heterogeneous conversion of NO2 on ground surfaces more important than aerosol; and (3) the dominant daytime source shifted from the homogenous reaction between NO and OH (51 %) to nitrate photolysis (53 %) during lockdown.
Dong Zhang, Xiao Li, Minghao Yuan, Yifei Xu, Qixiang Xu, Fangcheng Su, Shenbo Wang, and Ruiqin Zhang
Atmos. Chem. Phys., 24, 8549–8567, https://doi.org/10.5194/acp-24-8549-2024, https://doi.org/10.5194/acp-24-8549-2024, 2024
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The increasing concentration of O3 precursors and unfavorable meteorological conditions are key factors in the formation of O3 pollution in Zhengzhou. Vehicular exhausts (28 %), solvent usage (27 %), and industrial production (22 %) are identified as the main sources of NMVOCs. Moreover, O3 formation in Zhengzhou is found to be in an anthropogenic volatile organic compound (AVOC)-limited regime. Thus, to reduce O3 formation, a minimum AVOCs / NOx reduction ratio ≥ 3 : 1 is recommended.
Cited articles
Air Pollutants Emission Inventory: Air Pollutants Emission Inventory online
search, available at:
https://pollution-waste.canada.ca/air-emission-inventory (last access:
18 April 2018), 2015.
Akagi, S. K., Yokelson, R. J., Wiedinmyer, C., Alvarado, M. J., Reid, J. S.,
Karl, T., Crounse, J. D., and Wennberg, P. O.: Emission factors for open and
domestic biomass burning for use in atmospheric models, Atmos. Chem. Phys., 11,
4039–4072, https://doi.org/10.5194/acp-11-4039-2011, 2011.
Ambrose, J. L., Haase, K., Russo, R. S., Zhou, Y., White, M. L., Frinak, E. K.,
Jordan, C., Mayne, H. R., Talbot, R., and Sive, B. C.: A comparison of GC-FID
and PTR-MS toluene measurements in ambient air under conditions of enhanced
monoterpene loading, Atmos. Meas. Tech., 3, 959–980, https://doi.org/10.5194/amt-3-959-2010, 2010.
Ambrose, J. L., Zhou, Y., Haase, K., Mayne, H. R., Talbot, R., and Sive, B. C.:
A gas chromatographic instrument for measurement of hydrogen cyanide in the
lower atmosphere, Atmos. Meas. Tech., 5, 1229–1240, https://doi.org/10.5194/amt-5-1229-2012, 2012.
Araizaga, A. E., Mancilla, Y., and Mendoza, A.: Volatile organic compound
emissions from light-duty vehicles in Monterrey, Mexico: a tunnel study, Int.
J. Environ. Res., 7, 277–292, 2013.
Bahadur, R., Feng, Y., Russell, L. M., and Ramanathan, V.: Impact of California's
air pollution laws on black carbon and their implications for direct radiative
forcing, Atmos. Environ., 45, 1162–1167, 2011.
Ban-Weiss, G. A., McLaughlin, J. P., Harley, R. A., Lunden, M. M., Kirchstetter,
T. W., Kean, A. J., Strawa, A. W., Stevenson, E. D., and Kendall, G. R.: Long-term
changes in emissions of nitrogen oxides and particulate matter from on-road
gasoline and diesel vehicles, Atmos. Environ., 42, 220–232, 2008.
Ban-Weiss, G. A., Lunden, M. M., Kirchstetter, T. W., and Harley, R. A.:
Size-resolved particle number and volume emission factors for on-road gasoline
and diesel motor vehicles, J. Aerosol Sci., 41, 5–12, 2010.
Barillo, D. J.: Diagnosis and treatment of cyanide toxicity, J. Burn Care Res.,
30, 148–152, 2009.
Barth, M. C., Cochran, A. K., Fiddler, M. N., Roberts, J. M., and Bililign, S.:
Numerical modeling of cloud chemistry effects on isocyanic acid (HNCO), J.
Geophys. Res.-Atmos., 118, 8688–8701, 2013.
Baum, M. M., Moss, J. A., Pastel, S. H., and Poskrebyshev, G. A.: Hydrogen
cyanide exhaust emissions from in-use motor vehicles, Environ. Sci. Technol.,
41, 857–862, 2006.
Becker, K. H., Lörzer, Kurtenbach, R., Wiesen, P., Jensen, T. E., and
Wallington, T. J.: Nitrous oxide (N2O) emissions from vehicles,
Environ. Sci. Technol., 33, 4134–4139, 1999.
Beckerman, B., Jerrett, M., Brook, J. R., Verma, D. K., Arain, M. A., and
Finkelstein, M. M.: Correlation of nitrogen dioxide with other traffic pollutants
near a major expressway, Atmos. Environ., 42, 275–290, 2008.
Bishop, G. A. and Stedman, D. H.: A decade of on-road emissions measurements,
Environ. Sci. Technol., 42, 1651–1656, 2008.
Bond, T. C., Doherty, S. J., Fahey, D. W., Forster, P. M., Berntsen, T., DeAngelo,
B. J., Flanner, M. G., Ghan, S., Kärcher, B., Koch, D., Kinne, S., Kondo,
Y., Quinn, P. K., Sarofim, M. C., Schultz, M. G., Schulz, M., Venkataraman, C.,
Zhang, H., Zhang, S., Bellouin, N., Guttikunda, S. K., Hopke, P. K., Jacobson,
M. Z., Kaiser, J. W., Klimont, Z., Lohmann, U., Schwarz, J. P., Shindell, D.,
Storelvmo, T., Warren, S. G., and Zender, C. S.: Bounding the role of black
carbon in the climate system: A scientific assessment, J. Geophys. Res.-Atmos.,
118, 5380–5552, 2013.
Borduas, N., Abbatt, J. P., and Murphy, J. G.: Gas phase oxidation of
monoethanolamine (MEA) with OH radical and ozone: kinetics, products, and
particles, Environ. Sci. Technol., 47, 6377–6383, 2013.
Borduas, N., da Silva, G., Murphy, J. G., and Abbatt, J. P.: Experimental and
theoretical understanding of the gas phase oxidation of atmospheric amides with
OH radicals: kinetics, products, and mechanisms, J. Phys. Chem. A, 119, 4298–4308, 2015.
Borduas, N., Place, B., Wentworth, G. R., Abbatt, J. P. D., and Murphy, J. G.:
Solubility and reactivity of HNCO in water: insights into HNCO's fate in the
atmosphere, Atmos. Chem. Phys., 16, 703–714, https://doi.org/10.5194/acp-16-703-2016, 2016.
Bradow, R. L. and Stump, F. D.: Unregulated emissions from three-way catalyst
cars, SAE Tech. Pap. Ser., 770369, 7703, https://doi.org/10.4271/770369, 1977.
Brady, J. M., Crisp, T. A., Collier, S., Kuwayama, T., Forestieri, S. D.,
Perraud, V., Zhang, Q., Kleeman, M. J., Cappa, C. D., and Bertram, T. H.:
Real-time emission factor measurements of isocyanic acid from light duty
gasoline vehicles, Environ. Sci. Technol., 48, 11405–11412, 2014.
Brook, J. R., Burnett, R. T., Dann, T. F., Cakmak, S., Goldberg, M. S., Fan,
X., and Wheeler, A. J.: Further interpretation of the acute effect of nitrogen
dioxide observed in Canadian time-series studies, J. Exp. Sci. Environ. Epidemiol.,
17, S36, https://doi.org/10.1038/sj.jes.7500626, 2007.
Bukowiecki, N., Dommen, J., Prévôt, A. S. H., Richter, R., Weingartner,
E., and Baltensperger, U.: A mobile pollutant measurement laboratory – measuring
gas phase and aerosol ambient concentrations with high spatial and temporal
resolution, Atmos. Environ., 36, 5569–5579, 2002.
Cadle, S. H., Nebel, G. J., and Williams, R. L.: Measurements of unregulated
emissions from General Motors' light-duty vehicles, SAE Tech. Pap. Ser.,
790694, 7906, https://doi.org/10.4271/790694, 1979.
Canagaratna, M. R., Jayne, J. T., Ghertner, D. A., Herndon, S., Shi, Q., Jimenez,
J. L., Silva, P. J., Williams, P., Lanni, T., Drewnick, F., Demerjian, K. L.,
Kolb, C. E., and Worsnop, D. R.: Chase studies of particulate emissions from
in-use New York City vehicles, Aerosol Sci. Tech., 38, 555–573, 2004.
CCME – Canadian Council of Ministers of the Environment: Canada-Wide Standard
for Benzene: 2010 Final Report, January 2012, CCME, Winnipeg, Canada, 12 pp., 2012.
Chan, T. W., Brook, J. R., Smallwood, G. J., and Lu, G.: Time-resolved measurements
of black carbon light absorption enhancement in urban and near-urban locations
of southern Ontario, Canada, Atmos. Chem. Phys., 11, 10407–10432, https://doi.org/10.5194/acp-11-10407-2011, 2011.
Chan, T. W., Meloche, E., Kubsh, J., and Brezny, R.: Black Carbon Emissions in
Gasoline Exhaust and a Reduction Alternative with a Gasoline Particulate Filter,
Environ. Sci. Technol., 48, 6027–6034, 2014.
Chandra, B. P. and Sinha, V.: Contribution of post-harvest agricultural paddy
residue fires in the N.W. Indo-Gangetic Plain to ambient carcinogenic benzenoids,
toxic isocyanic acid and carbon monoxide, Environ. Int., 88, 187–197, 2016.
Choi, M. Y., Hamins, A., Mulholland, G. W., and Kashiwagi, T.: Simultaneous
optical measurement of soot volume fraction and temperature in premixed flames,
Combust. Flame, 99, 174–186, 1994.
Coderre, A. R., Thomson, K. A., Snelling, D. R., and Johnson, M. R.: Spectrally
resolved light absorption properties of cooled soot from a methane flame, Appl.
Phys. B, 104, 175–188, 2011.
Coggon, M. M., Veres, P. R., Yuan, B., Koss, A., Warneke, C., Gilman, J. B.,
Lerner, B. M., Peischl, J., Aikin, K. C., Stockwell, C. E., Hatch, L. E.,
Ryerson, T. B., Roberts, J. M., Yokelson, R. J., de Gouw, J. A.: Emissions of
nitrogen-containing organic compounds from the burning of herbaceous and
arboraceous biomass: Fuel composition dependence and the variability of
commonly used nitrile tracers, Geophys. Res. Lett., 43, 9903–9912, 1016.
Crounse, J. D., DeCarlo, P. F., Blake, D. R., Emmons, L. K., Campos, T. L., Apel,
E. C., Clarke, A. D., Weinheimer, A. J., McCabe, D. C., Yokelson, R. J., Jimenez,
J. L., and Wennberg, P. O.: Biomass burning and urban air pollution over the
Central Mexican Plateau, Atmos. Chem. Phys., 9, 4929–4944, https://doi.org/10.5194/acp-9-4929-2009, 2009.
Dallmann, T. R., DeMartini, S. J., Kirchstetter, T. W., Herndon, S. C., Onasch,
T. B., Wood, E. C., and Harley, R. A.: On-road measurement of gas and particle
phase pollutant emission factors for individual heavy-duty diesel trucks,
Environ. Sci. Technol., 46, 8511–8518, 2012.
Dallmann, T. R., Kirchstetter, T. W., DeMartini, S. J., and Harley, R. A.:
Quantifying on-road emissions from gasoline-powered motor vehicles: Accounting
for the presence of medium- and heavy-duty diesel trucks, Environ. Sci. Technol.,
47, 13873–13881, 2013.
Dominici, F., Peng, R. D., Barr, C. D., and Bell, M. L.: Protecting human health
from air pollution: Shifting from a single-pollutant to a multi-pollutant
approach, Epidemiology, 21, 187–194, 2010.
ECCC – Environment and Climate Change Canada: Canada's Black Carbon Inventory:
2017 Edition, ECCC, Canada, 29 pp., 2017.
Franco, V., Kousoulidou, M., Muntean, M., Ntziachristos, L., Hausberger, S.,
and Dilara, P.: Road vehicle emission factors development: A review, Atmos.
Environ., 70, 84–97, 2013.
Gentner, D. R., Worton, D. R., Isaacman, G., Davis, L. C., Dallmann, T. R.,
Wood, E. C., Herndon, S. C., Goldstein, A. H., and Harley, R. A.: Chemical
composition of gas-phase organic carbon emissions from motor vehicles and
implications for ozone production, Environ. Sci. Technol., 47, 11837–11848, 2013.
Grahame, T. J., Klemm, R., and Schlesinger, R. B.: Public health and components
of particulate matter: The changing assessment of black carbon, J. Air Waste
Manage. Assoc., 64, 620–660, 2014.
Government of Canada: Pan Am 2016 Study, available at: https://open.canada.ca/data/en/dataset/1260ee96-7acf-489e-826b-de96f0c19fcb,
last access: 20 November 2018.
Harvey, C. A., Garbe, R. J., Baines, T. M., Somers, J. H., Hellman, K. H.,
and Carey, P. M.: A study of the potential impact of some unregulated motor vehicle emissions,
SAE Tech. Pap. Ser., 830987, 8309, https://doi.org/10.4271/830987, 1983.
Heeb, N. V., Zimmerli, Y., Czerwinski, J., Schmid, P., Zennegg, M., Haag, R.,
Seiler, C., Wichser, A., Ulrich, A., Honegger, P., Zeyer, K., Emmenegger, L.,
Mosimann, T., Kasper, M., and Mayer, A.: Reactive nitrogen compounds (RNCs) in
exhaust of advanced PM–NOx abatement technologies for future
diesel applications, Atmos. Environ., 45, 3203–3209, 2011.
Heeb, N. V., Haag, R., Seiler, C., Schmid, P., Zennegg, M., Wichser, A., Ulrich,
A., Honegger, P., Zeyer, K., Emmenegger, L., Zimmerli, Y., Czerwinski, J.,
Kasper, M., and Mayer, A.: Effects of a combined Diesel particle filter-DeNOx
system (DPN) on reactive nitrogen compounds emissions: a parameter study,
Environ. Sci. Technol., 46, 13317–13325, 2012.
HEI Panel on the Health Effects of Traffic-Related Air Pollution: Traffic-related
air pollution: A critical review of the literature on emissions, exposure, and
health effects, HEI Special Report 17, Health Effects Institute, Boston, MA, 386 pp., 2010.
Highwood, E. J. and Kinnersley, R. P.: When smoke gets in our eyes: The multiple
impacts of atmospheric black carbon on climate, air quality and health, Environ.
Int., 32, 560–566, 2006.
Ho, K. F., Lee, S. C., Ho, W. K., Blake, D. R., Cheng, Y., Li, Y. S., Ho, S. S.
H., Fung, K., Louie, P. K. K., and Park, D.: Vehicular emission of volatile
organic compounds (VOCs) from a tunnel study in Hong Kong, Atmos. Chem. Phys.,
9, 7491–7504, https://doi.org/10.5194/acp-9-7491-2009, 2009.
Hudda, N., Fruin, S., Delfino, R. J., and Sioutas, C.: Efficient determination
of vehicle emission factors by fuel use category using on-road measurements:
downward trends on Los Angeles freight corridor I-710, Atmos. Chem. Phys., 13,
347–357, https://doi.org/10.5194/acp-13-347-2013, 2013.
Hwa, M.-Y., Hsieh, C.-C., Wu, T.-C., and Chang, L.-F. W.: Real-world vehicle
emissions and VOCs profile in the Taipei tunnel located at Taiwan Taipei area,
Atmos. Environ., 36, 1993–2002, 2002.
Janssen, N. A., Hoek, G., Simic-Lawson, M., Fischer, P., van Bree, L., ten Brink,
H., Keuken, M., Atkinson, R. W., Anderson, H. R., Brunekreef, B., and Cassee,
F. R.: Black carbon as an additional indicator of the adverse health effects of
airborne particles compared with PM10 and PM2.5, Environ. Health
Perspect., 119, 1691–1699, 2011.
Jathar, S. H., Heppding, C., Link, M. F., Farmer, D. K., Akherati, A., Kleeman,
M. J., de Gouw, J. A., Veres, P. R., and Roberts, J. M.: Investigating diesel
engines as an atmospheric source of isocyanic acid in urban areas, Atmos. Chem.
Phys., 17, 8959–8970, https://doi.org/10.5194/acp-17-8959-2017, 2017.
Jerrett, M., Finkelstein, M. M., Brook, J. R., Arain, M. A., Kanaroglou, P.,
Stieb, D. M., Gilbert, N. L., Verma, D., Finkelstein, N., and Chapman, K. R.:
A cohort study of traffic-related air pollution and mortality in Toronto,
Ontario, Canada, Environ. Health Perspect., 117, 772–777, 2009.
Jiang, M., Marr, L. C., Dunlea, E. J., Herndon, S. C., Jayne, J. T., Kolb, C. E.,
Knighton, W. B., Rogers, T. M., Zavala, M., Molina, L. T., and Molina, M. J.:
Vehicle fleet emissions of black carbon, polycyclic aromatic hydrocarbons, and
other pollutants measured by a mobile laboratory in Mexico City, Atmos. Chem.
Phys., 5, 3377–3387, https://doi.org/10.5194/acp-5-3377-2005, 2005.
Jimenez, J. L., McRae, G. J., Nelson, D. D., Zahniser, M. S., and Kolb, C. E.:
Remote sensing of NO and NO2 emissions from heavy-duty diesel trucks
using tunable diode lasers, Environ. Sci. Technol., 34, 2380–2387, 2000.
Joe, P., Belair, S., Bernier, N. B., Bouchet, V., Brook, J. R., Brunet, D.,
Burrows, W., Charland, J. P., Dehghan, A., Driedger, N., Duhaime, C., Evans,
G., Filion, A.-B., Frenette, R., Grandpré, J. d., Gultepe, I., Henderson,
D., Herdt, A., Hilker, N., Huang, L., Hung, E., Isaac, G., Jeong, C.-H.,
Johnston, D., Klaassen, J., Leroyer, S., Lin, H., MacDonald, M., MacPhee, J.,
Mariani, Z., Munoz, T., Reid, J., Robichaud, A., Rochon, Y., Shairsingh, K.,
Sills, D., Spacek, L., Stroud, C., Su, Y., Taylor, N., Vanos, J., Voogt, J.,
Wang, J. M., Wiechers, T., Wren, S., Yang, H., and Yip, T.: The Environment
and Canada Pan and ParaPan American Science Showcase Project, B. Am.
Meteorol. Soc., 99,
921–953, https://doi.org/10.1175/BAMS-D-16-0162.1, 2018.
Jordan, A., Haidacher, S., Hanel, G., Hartungen, E., Märk, L., Seehauser,
H., Schottkowsky, R., Sulzer, P., and Märk, T. D.: A high resolution and
high sensitivity proton-transfer-reaction time-of-flight mass spectrometer
(PTR-TOF-MS), Int. J. Mass Spectrom., 286, 122–128, 2009.
Karlsson, H. L.: Ammonia, nitrous oxide and hydrogen cyanide emissions from
five passenger vehicles, Sci. Total Environ., 334–335, 125–132, 2004.
Keirns, M. H. and Holt, E. L.: Hydrogen cyanide emissions from three-way
catalyst prototypes under malfunctioning conditions, SAE Tech. Pap. Ser.,
780201, https://doi.org/10.4271/780201, 1978.
Kirchstetter, T. W., Harley, R. A., Kreisberg, N. M., Stolzenburg, M. R., and
Hering, S. V.: On-road measurement of fine particle and nitrogen oxide
emissions from light- and heavy-duty motor vehicles, Atmos. Environ., 33,
2955–2968, 1999.
Knighton, W. B., Fortner, E. C., Midey, A. J., Viggiano, A. A., Herndon, S. C.,
Wood, E. C., and Kolb, C. E.: HCN detection with a proton transfer reaction
mass spectrometer, Int. J. Mass Spectrom., 283, 112–121, 2009.
Knox, A., Evans, G. J., Brook, J. R., Yao, X., Jeong, C. H., Godri, K. J.,
Sabaliauskas, K., and Slowik, J. G.: Mass absorption cross-section of ambient
black carbon aerosol in relation to chemical age, Aerosol Sci. Tech., 43, 522–532, 2009.
Krecl, P., Johansson, C., Targino, A. C., Ström, J., and Burman, L.: Trends
in black carbon and size-resolved particle number concentrations and vehicle
emission factors under real-world conditions, Atmos. Environ., 165, 155–168, 2017.
Kristensson, A., Johansson, C., Westerholm, R., Swietlicki, E., Gidhagen, L.,
Wideqvist, U., and Vesely, V.: Real-world traffic emission factors of gases and
particles measured in a road tunnel in Stockholm, Sweden, Atmos. Environ., 38, 657–673, 2004.
Kröcher, O., Elsener, M., and Koebel, M.: An ammonia and isocyanic acid
measuring method for soot containing exhaust gases, Anal. Chim. Acta, 537, 393–400, 2005.
Kumar, V., Chandra B. P., Sinha, V.: Large unexplained suite of chemically
reactive compounds present in ambient air due to biomass fires, Sci. Rep., 8,
626, https://doi.org/10.1038/s41598-017-19139-3, 2018.
Larson, T., Gould, T., Riley, E. A., Austin, E., Fintzi, J., Sheppard, L., Yost,
M., and Simpson, C.: Ambient air quality measurements from a continuously moving
mobile platform: Estimation of area-wide, fuel-based, mobile source emission
factors using absolute principal component scores, Atmos. Environ., 152, 201–211, 2017.
Le Breton, M., Bacak, A., Muller, J. B. A., O'Shea, S. J., Xiao, P., Ashfold,
M. N. R., Cooke, M. C., Batt, R., Shallcross, D. E., Oram, D. E., Forster, G.,
Bauguitte, S. J.-B., Palmer, P. I., Parrington, M., Lewis, A. C., Lee, J. D.,
and Percival, C. J.: Airborne hydrogen cyanide measurements using a chemical
ionisation mass spectrometer for the plume identification of biomass burning
forest fires, Atmos. Chem. Phys., 13, 9217–9232, https://doi.org/10.5194/acp-13-9217-2013, 2013.
Levy, I., Mihele, C., Lu, G., Narayan, J., Hilker, N., and Brook, J. R.:
Elucidating multipollutant exposure across a complex metropolitan area by
systematic deployment of a mobile laboratory, Atmos. Chem. Phys., 14, 7173–7193,
https://doi.org/10.5194/acp-14-7173-2014, 2014.
Li, Q., Jacob, D. J., Bey, I., Yantosca, R. M., Zhao, Y., Kondo, Y., and Notholt,
J.: Atmospheric hydrogen cyanide (HCN): Biomass burning source, ocean sink?,
Geophys. Res. Lett., 27, 357–360, 2000.
Li, Q., Jacob, D. J., Yantosca, R. M., Heald, C. L., Singh, H. B., Koike, M.,
Zhao, Y., Sachse, G. W., and Streets, D. G.: A global three-dimensional model
analysis of the atmospheric budgets of HCN and CH3CN: Constraints
from aircraft and ground measurements, J. Geophys. Res.-Atmos., 108, 8827,
https://doi.org/10.1029/2002JD003075, 2003.
Li, Q., Palmer, P. I., Pumphrey, H. C., Bernath, P., and Mahieu, E.: What drives
the observed variability of HCN in the troposphere and lower stratosphere?,
Atmos. Chem. Phys., 9, 8531–8543, https://doi.org/10.5194/acp-9-8531-2009, 2009.
Li, S.-M., Leithead, A., Moussa, S. G., Liggio, J., Moran, M. D., Wang, D.,
Hayden, K., Darlington, A., Gordon, M., Staebler, R., Makar, P. A., Stroud, C.
A., McLaren, R., Liu, P. S. K., O'Brien, J., Mittermeier, R. L., Zhang, J.,
Marson, G., Cober, S. G., Wolde, M., and Wentzell, J. J. B.: Differences
between measured and reported volatile organic compound emissions from oil sands
facilities in Alberta, Canada, P. Natl. Acad. Sci. USA, 114, E3756–E3765, 2017.
Liggio, J., Gordon, M., Smallwood, G., Li, S.-M., Stroud, C., Staebler, R., Lu,
G., Lee, P., Taylor, B., and Brook, J. R.: Are emissions of black carbon from
gasoline vehicles underestimated? Insights from near and on-road measurements,
Environ. Sci. Technol., 46, 4819–4828, 2012.
Liggio, J., Moussa, S. G., Wentzell, J., Darlington, A., Liu, P., Leithead, A.,
Hayden, K., O'Brien, J., Mittermeier, R. L., Staebler, R., Wolde, M., and Li,
S.-M.: Understanding the primary emissions and secondary formation of gaseous
organic acids in the oil sands region of Alberta, Canada, Atmos. Chem. Phys.,
17, 8411–8427, https://doi.org/10.5194/acp-17-8411-2017, 2017a.
Liggio, J., Stroud, C. A., Wentzell, J. J. B., Zhang, J., Sommers, J.,
Darlington, A., Liu, P. S. K., Moussa, S. G., Leithead, A., Hayden, K.,
Mittermeier, R. L., Staebler, R., Wolde, M., and Li, S. M.: Quantifying the
primary emissions and photochemical formation of isocyanic acid downwind of
oil sands operations, Environ. Sci. Technol., 51, 14462–14471, 2017b.
Link, M. F., Friedman, B., Fulgham, R., Brophy, P., Galang, A., Jathar, S. H.,
Veres, P., Roberts, J. M., and Farmer, D. K.: Photochemical processing of diesel
fuel emissions as a large secondary source of isocyanic acid (HNCO), Geophys.
Res. Lett., 43, 4033–4041, 2016.
Logue, B. A., Hinkens, D. M., Baskin, S. I., and Rockwood, G. A.: The analysis
of cyanide and its breakdown products in biological samples, Crit. Rev. Anal.
Chem., 40, 122–147, 2010.
Lough, G. C., Schauer, J. J., Lonneman, W. A., and Allen, M. K.: Summer and
winter nonmethane hydrocarbon emissions from on-road motor vehicles in the
Midwestern United States, J. Air Waste Manage. Assoc., 55, 629–646, 2005.
Matz, C. J., Stieb, D. M., and Brion, O.: Urban-rural differences in daily
time-activity patterns, occupational activity and housing characteristics,
Environ. Health, 14, 88, https://doi.org/10.1186/s12940-015-0075-y, 2015.
Mauderly, J. L. and Samet, J. M.: Is there evidence for synergy among air
pollutants in causing health effects?, Environ. Health Perspect., 117, 1–6, 2009.
McCarter, J.: 2012 Annual Report, Offic of the Auditor General of Ontario,
Ontario, Canada, 457 pp., 2012.
McDonald, B. C., Dallmann, T. R., Martin, E. W., and Harley, R. A.: Long-term
trends in nitrogen oxide emissions from motor vehicles at national, state, and
air basin scales, J. Geophys. Res.-Atmos., 117, D00V18, https://doi.org/10.1029/2012JD018304, 2012.
McDonald, B. C., Gentner, D. R., Goldstein, A. H., and Harley, R. A.: Long-Term
Trends in Motor Vehicle Emissions in U.S. Urban Areas, Environ. Sci. Technol.,
47, 10022–10031, 2013.
Moussa, S. G., Leithead, A., Li, S.-M., Chan, T. W., Wentzell, J. J. B., Stroud,
C., Zhang, J., Lee, P., Lu, G., Brook, J. R., Hayden, K., Narayan, J., and
Liggio, J.: Emissions of hydrogen cyanide from on-road gasoline and diesel
vehicles, Atmos. Environ., 131, 185–195, 2016.
Natural Resources Canada's Office of Energy Efficiency: Canadian Vehicle Survey:
2009 Summary Report, Natural Resources Canada, Ottawa, Canada, 72 pp., 2011.
Park, S. S., Kozawa, K., Fruin, S., Mara, S., Hsu, Y. K., Jakober, C., Winer,
A., and Herner, J.: Emission factors for high-emitting vehicles based on on-road
measurements of individual vehicle exhaust with a mobile measurement platform,
J. Air Waste Manage. Assoc., 61, 1046–1056, 2011.
Parrish, D. D.: Critical evaluation of US on-road vehicle emission
inventories, Atmos. Environ., 40, 2288–2300, 2006.
Pavlovic, R., Chen, J., Anderson, K., Moran, M. D., Beaulieu, P.-A., Davignon,
D., and Cousineau, S.: The FireWork air quality forecast system with
near-real-time biomass burning emissions: Recent developments and evaluation
of performance for the 2015 North American wildfire season, J. Air Waste Manage.
Assoc., 66, 819–841, 2016.
Petzold, A., Ogren, J. A., Fiebig, M., Laj, P., Li, S.-M., Baltensperger, U.,
Holzer-Popp, T., Kinne, S., Pappalardo, G., Sugimoto, N., Wehrli, C., Wiedensohler,
A., and Zhang, X.-Y.: Recommendations for reporting “black carbon” measurements,
Atmos. Chem. Phys., 13, 8365–8379, https://doi.org/10.5194/acp-13-8365-2013, 2013.
Pope, C. A. and Dockery, D. W.: Health effects of fine particulate air pollution:
Lines that connect, J. Air Waste Manage. Assoc., 56, 709–742, 2006.
Rinsland, C. P., Dufour, G., Boone, C. D., Bernath, P. F., Chiou, L., Coheur,
P.-F., Turquety, S., and Clerbaux, C.: Satellite boreal measurements over Alaska
and Canada during June–July 2004: Simultaneous measurements of upper tropospheric
CO, C2H6, HCN, CH3Cl, CH4, C2H2,
CH3OH, HCOOH, OCS, and SF6 mixing ratios, Global Biogeochem.
Cy., 21, GB3008, https://doi.org/10.1029/2006gb002795, 2007.
Roberts, J. M., Veres, P. R., Cochran, A. K., Warneke, C., Burling, I. R.,
Yokelson, R. J., Lerner, B., Gilman, J. B., Kuster, W. C., Fall, R., and de Gouw,
J.: Isocyanic acid in the atmosphere and its possible link to smoke-related
health effects, P. Natl. Acad. Sci. USA, 108, 8966–8971, 2011.
Roberts, J. M., Veres, P. R., VandenBoer, T. C., Warneke, C., Graus, M.,
Williams, E. J., Lefer, B., Brock, C. A., Bahreini, R., Öztürk, F.,
Middlebrook, A. M., Wagner, N. L., Dubé, W. P., and de Gouw, J. A.: New
insights into atmospheric sources and sinks of isocyanic acid, HNCO, from recent
urban and regional observations, J. Geophys. Res.-Atmos., 119, 1060–1072, 2014.
Saliba, G., Saleh, R., Zhao, Y., Presto, A. A., Lambe, A. T., Frodin, B., Sardar,
S., Maldonado, H., Maddox, C., May, A. A., Drozd, G. T., Goldstein, A. H.,
Russell, L. M., Hagen, F., and Robinson, A. L.: Comparison of gasoline
direct-injection (GDI) and port fuel injection (PFI) vehicle emissions: Emission
certification standards, cold-start, secondary organic aerosol formation
potential, and potential climate impacts, Environ. Sci. Technol., 51, 6542–6552, 2017.
Sarkar, C., Sinha, V., Kumar, V., Rupakheti, M., Panday, A., Mahata, K. S.,
Rupakheti, D., Kathayat, B., and Lawrence, M. G.: Overview of VOC emissions and
chemistry from PTR-TOF-MS measurements during the SusKat-ABC campaign: high
acetaldehyde, isoprene and isocyanic acid in wintertime air of the Kathmandu
Valley, Atmos. Chem. Phys., 16, 3979–4003, https://doi.org/10.5194/acp-16-3979-2016, 2016.
Shim, C., Wang, Y., Singh, H. B., Blake, D. R., and Guenther, A. B.: Source
characteristics of oxygenated volatile organic compounds and hydrogen
cyanide, J. Geophys. Res.-Atmos., 112, D10305, https://doi.org/10.1029/2006JD007543,
2007.
Snelling, D. R., Smallwood, G. J., Liu, F., Gülder, Ö. L., and Bachalo,
W. D.: A calibration-independent laser-induced incandescence technique for soot
measurement by detecting absolute light intensity, Appl. Optics, 44, 6773–6785, 2005.
Statistics Canada: Road motor vehicle registrations, by type of vehicle,
available at:
http://www.statcan.gc.ca/tables-tableaux/sum-som/l01/cst01/trade14b-eng.htm
(last access: 18 April 2018), 2016.
Stirn, R., Baquet, T. G., Kanjarkar, S., Meier, W., Geigle, K. P., Grotheer, H.
H., Wahl, C., and Aigner, M.: Comparison of particle size measurements with
laser-induced incandescence, mass spectroscopy, and scanning mobility particle
sizing in a laminar premixed ethylene/air flame, Combust. Sci. Technol.,
181, 329–349, 2009.
Suarez-Bertoa, R. and Astorga, C.: Isocyanic acid and ammonia in vehicle
emissions, Transp. Res. D, 49, 259–270, 2016.
Tan, Y., Lipsky, E. M., Saleh, R., Robinson, A. L., and Presto, A. A.:
Characterizing the spatial variation of air pollutants and the contributions of
high emitting vehicles in Pittsburgh, PA, Environ. Sci. Technol., 48, 14186–14194, 2014.
Urban, C. M. and Garbe, R. J.: Regulated and unregulated exhaust emissions from
malfunctioning automobiles, SAE Tech. Pap. Ser., 790696, 7906, https://doi.org/10.4271/790696, 1979.
Urban, C. M. and Garbe, R. J.: Exhaust emissions form malfunctioning three-way
catalyst-equipped automobiles, SAE Tech. Pap. Ser., 800511, 8005, https://doi.org/10.4271/800511, 1980.
US EPA – US Environmental Protection Agency: Toxicological review of hydrogen
cyanide and cyanide salts, September 2010, US EPA, Washington, D.C., 153 pp., 2010.
Veres, P., Roberts, J. M., Warneke, C., Welsh-Bon, D., Zahniser, M., Herndon,
S., Fall, R., and de Gouw, J.: Development of negative-ion proton-transfer
chemical-ionization mass spectrometry (NI-PT-CIMS) for the measurement of
gas-phase organic acids in the atmosphere, Int. J. Mass Spectrom., 274, 48–55, 2008.
Veres, P., Roberts, J. M., Burling, I. R., Warneke, C., de Gouw, J., and
Yokelson, R. J.: Measurements of gas-phase inorganic and organic acids from
biomass fires by negative-ion proton-transfer chemical-ionization mass
spectrometry, J. Geophys. Res.-Atmos., 115, D23302, https://doi.org/10.1029/2010JD014033, 2010.
Wang, J. M., Jeong, C.-H., Zimmerman, N., Healy, R. M., Wang, D. K., Ke, F.,
and Evans, G. J.: Plume-based analysis of vehicle fleet air pollutant emissions
and the contribution from high emitters, Atmos. Meas. Tech., 8, 3263–3275,
https://doi.org/10.5194/amt-8-3263-2015, 2015.
Wang, Y., Xing, Z., Zhao, S., Zheng, M., Mu, C., and Du, K.: Are emissions of
black carbon from gasoline vehicles overestimated? Real-time, in situ measurement
of black carbon emission factors, Sci. Total Environ., 547, 422–428, 2016.
Wang, Z., Nicholls, S. J., Rodriguez, E. R., Kummu, O., Hörkkö, S.,
Barnard, J., Reynolds, W. F., Topol, E. J., DiDonato, A. J., and Hazen, S. L.:
Protein carbamylation links inflammation, smoking,uremia and atherogenesis,
Nat. Med., 13, 1176–1184, 2007.
Wentzell, J. J., Liggio, J., Li, S. M., Vlasenko, A., Staebler, R., Lu, G.,
Poitras, M. J., Chan, T., and Brook, J. R.: Measurements of gas phase acids
in diesel exhaust: a relevant source of HNCO?, Environ. Sci. Technol., 47, 7663–7671, 2013.
Westerdahl, D., Wang, X., Pan, X., and Zhang, K. M.: Characterization of on-road
vehicle emission factors and microenvironmental air quality in Beijing, China,
Atmos. Environ., 43, 697–705, 2009.
Woodward-Massey, R., Taha, Y. M., Moussa, S. G., and Osthoff, H. D.: Comparison
of negative-ion proton-transfer with iodide ion chemical ionization mass
spectrometry for quantification of isocyanic acid in ambient air, Atmos. Environ.,
98, 693–703, 2014.
Wu, J. S., Krishnan, S. S., and Faeth, G. M.: Refractive indices at visible
wavelengths of soot emitted from buoyant turbulent diffusion flames, J. Heat
Transfer, 119, 230–237, 1997.
Yli-Tuomi, T., Aarnio, P., Pirjola, L., Mäkelä, T., Hillamo, R., and
Jantunen, M.: Emissions of fine particles, NOx, and CO from
on-road vehicles in Finland, Atmos. Environ., 39, 6696–6706, 2005.
You, Y., Staebler, R. M., Moussa, S. G., Su, Y., Munoz, T., Stroud, C., Zhang,
J., and Moran, M. D.: Long-path measurements of pollutants and micrometeorology
over Highway 401 in Toronto, Atmos. Chem. Phys., 17, 14119–14143, https://doi.org/10.5194/acp-17-14119-2017, 2017.
Young, P. J., Emmons, L. K., Roberts, J. M., Lamarque, J.-F., Wiedinmyer, C.,
Veres, P., and VandenBoer, T. C.: Isocyanic acid in a global chemistry transport
model: Tropospheric distribution, budget, and identification of regions with
potential health impacts, J. Geophys. Res.-Atmos., 117, D10308, https://doi.org/10.1029/2011JD017393, 2012.
Zavala, M., Herndon, S. C., Slott, R. S., Dunlea, E. J., Marr, L. C., Shorter,
J. H., Zahniser, M., Knighton, W. B., Rogers, T. M., Kolb, C. E., Molina, L. T.,
and Molina, M. J.: Characterization of on-road vehicle emissions in the Mexico
City Metropolitan Area using a mobile laboratory in chase and fleet average
measurement modes during the MCMA-2003 field campaign, Atmos. Chem. Phys., 6,
5129–5142, https://doi.org/10.5194/acp-6-5129-2006, 2006.
Zavala, M., Herndon, S. C., Wood, E. C., Jayne, J. T., Nelson, D. D., Trimborn,
A. M., Dunlea, E., Knighton, W. B., Mendoza, A., Allen, D. T., Kolb, C. E.,
Molina, M. J., and Molina, L. T.: Comparison of emissions from on-road sources
using a mobile laboratory under various driving and operational sampling modes,
Atmos. Chem. Phys., 9, 1–14, https://doi.org/10.5194/acp-9-1-2009, 2009.
Zhao, R., Lee, A. K. Y., Wentzell, J. J. B., McDonald, A. M., Toom-Sauntry, D.,
Leaitch, W. R., Modini, R. L., Corrigan, A. L., Russell, L. M., Noone, K. J.,
Schroder, J. C., Bertram, A. K., Hawkins, L. N., Abbatt, J. P. D., and Liggio,
J.: Cloud partitioning of isocyanic acid (HNCO) and evidence of secondary source
of HNCO in ambient air, Geophys. Res. Lett., 41, 6962–6969, 2014.
Zhao, Y., Strong, K., Kondo, Y., Koike, M., Matsumi, Y., Irie, H., Rinsland, C.
P., Jones, N. B., Suzuki, K., Nakajima, H., Nakane, H., and Murata, I.:
Spectroscopic measurements of tropospheric CO, C2H6, C2H2
and HCN in northern Japan, J. Geophys. Res.-Atmos., 107, 4343, https://doi.org/10.1029/2001JD000748, 2002.
Zimmerman, N., Wang, J. M., Jeong, C. H., Ramos, M., Hilker, N., Healy, R. M.,
Sabaliauskas, K., Wallace, J. S., and Evans, G. J.: Field measurements of
gasoline direct injection emission factors: Spatial and seasonal variability,
Environ. Sci. Technol., 50, 2035–2043, 2016.
Short summary
We made measurements from a mobile laboratory across a large urban area and determined fleet-average vehicle emission factors (EFs) for a suite of traffic-related air pollutants. We present the first real-world EFs for isocyanic acid (HNCO) and hydrogen cyanide (HCN) and insight into their on-road variability. We find that vehicles may represent an important source of these air toxics at an urban scale. This work has implications for understanding population exposure to these species.
We made measurements from a mobile laboratory across a large urban area and determined...
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