Articles | Volume 22, issue 13
https://doi.org/10.5194/acp-22-8597-2022
© Author(s) 2022. 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-22-8597-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
05 Jul 2022
Research article |
| 05 Jul 2022
| 05 Jul 2022
Dramatic changes in atmospheric pollution source contributions for a coastal megacity in northern China from 2011 to 2020
Baoshuang Liu
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
CMA-NKU Cooperative Laboratory for Atmospheric Environment–Health Research, Tianjin 300350, China
Yanyang Wang
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
CMA-NKU Cooperative Laboratory for Atmospheric Environment–Health Research, Tianjin 300350, China
He Meng
Qingdao Eco-environment Monitoring Center of Shandong Province, Qingdao 266003, China
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
CMA-NKU Cooperative Laboratory for Atmospheric Environment–Health Research, Tianjin 300350, China
Liuli Diao
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
CMA-NKU Cooperative Laboratory for Atmospheric Environment–Health Research, Tianjin 300350, China
Jianhui Wu
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
CMA-NKU Cooperative Laboratory for Atmospheric Environment–Health Research, Tianjin 300350, China
Laiyuan Shi
Qingdao Eco-environment Monitoring Center of Shandong Province, Qingdao 266003, China
Jing Wang
Qingdao Eco-environment Monitoring Center of Shandong Province, Qingdao 266003, China
Yufen Zhang
CORRESPONDING AUTHOR
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
CMA-NKU Cooperative Laboratory for Atmospheric Environment–Health Research, Tianjin 300350, China
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
CMA-NKU Cooperative Laboratory for Atmospheric Environment–Health Research, Tianjin 300350, China
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Subject: Aerosols | Research Activity: Field Measurements | Altitude Range: Troposphere | Science Focus: Chemistry (chemical composition and reactions)
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Atmospheric evolution of environmentally persistent free radicals in the rural North China Plain: effects on water solubility and PM2.5 oxidative potential
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Automated compound speciation, cluster analysis, and quantification of organic vapors and aerosols using comprehensive two-dimensional gas chromatography and mass spectrometry
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Aerosol optical properties within the atmospheric boundary layer predicted from ground-based observations compared to Raman lidar retrievals during RITA-2021
Hygroscopic growth and activation changed submicron aerosol composition and properties in the North China Plain
Measurement report: Formation of tropospheric brown carbon in a lifting air mass
Vertical variability of aerosol properties and trace gases over a remote marine region: a case study over Bermuda
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Characterizing water solubility of fresh and aged secondary organic aerosol in PM2.5 with the stable carbon isotope technique
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Critical contribution of chemically diverse carbonyl molecules to the oxidative potential of atmospheric aerosols
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Daytime and nighttime aerosol soluble iron formation in clean and slightly polluted moist air in a coastal city in eastern China
Non-negligible secondary contribution to brown carbon in autumn and winter: inspiration from particulate nitrated and oxygenated aromatic compounds in urban Beijing
Non-sea-salt aerosols that contain trace bromine and iodine are widespread in the remote troposphere
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Formation and chemical evolution of SOA in two different environments: A dual chamber study
Enhanced daytime secondary aerosol formation driven by gas-particle partitioning in downwind urban plumes
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Atmos. Chem. Phys., 24, 12775–12792, https://doi.org/10.5194/acp-24-12775-2024, https://doi.org/10.5194/acp-24-12775-2024, 2024
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Coastal environments provide an ideal setting for investigating the intermixing of terrestrial and marine aerosols. Terrestrial air mass constituted a larger number of microbes from anthropogenic and soil emissions, whereas saprophytic and gut microbes were predominant in marine samples. Mixed air masses indicated a fusion of marine and terrestrial aerosols, characterized by alterations in the ratio of pathogenic and saprophytic microbes when compared to either terrestrial or marine samples.
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Prescribed burning is an important method for managing ecosystems and preventing wildfires. However, smoke from prescribed fires can have a significant impact on air quality. Here, using a network of fixed sites and sampling throughout an extended prescribed burning period in 2 different years, we characterize emissions and evolutions of up to 8 h of PM2.5 mass, black carbon (BC), and brown carbon (BrC) in smoke from burning of forested lands in the southeastern USA.
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This opinion paper explores how advances in aerosol science inform our understanding of the health impacts of outdoor particulate pollution. We advocate for a shift in the way we target PM pollution, focusing on the most harmful anthropogenic emissions. We highlight key observations, modelling developments, and emission measurements needed to achieve this shift.
Pramod Kumar, Khushboo Sharma, Ankita Malu, Rajeev Rajak, Aparna Gupta, Bidyutjyoti Baruah, Shailesh Yadav, Thupstan Angchuk, Jayant Sharma, Rakesh Kumar Ranjan, Anil Kumar Misra, and Nishchal Wanjari
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This work monitors and assesses air pollution, especially black and brown carbon, its controlling factor, and its effect on the environment of Sikkim Himalayan region. The huge urban sprawl in recent decades has led to regional human-induced air pollution in the region. Black carbon was highest in April 2021 and March 2022, exceeding the WHO limit. The monsoon season causes huge rainfall over the region, which reduces the pollutants by scavenging (rainout and washout).
Maria P. Velásquez-García, K. Santiago Hernández, James A. Vergara-Correa, Richard J. Pope, Miriam Gómez-Marín, and Angela M. Rendón
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In the Aburrá Valley, northern South America, local emissions determine air quality conditions. However, we found that external sources, such as regional fires, Saharan dust, and volcanic emissions, increase particulate concentrations and worsen chemical composition by introducing elements like heavy metals. Dry winds and source variability contribute to seasonal influences on these events. This study assesses the air quality risks posed by such events, which can affect broad regions worldwide.
Meng Wang, Qiyuan Wang, Steven Sai Hang Ho, Jie Tian, Yong Zhang, Shun-cheng Lee, and Junji Cao
Atmos. Chem. Phys., 24, 11175–11189, https://doi.org/10.5194/acp-24-11175-2024, https://doi.org/10.5194/acp-24-11175-2024, 2024
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We studied nitrogen-containing organic compounds (NOCs) in particulate matter <2.5 µm particles on the southeastern Tibetan Plateau. We found that biomass burning and transboundary transport are the main sources of NOCs in the high-altitude area. Understanding these aerosol sources informs how they add to regional and potentially global climate changes. Our findings could help shape effective environmental policies to enhance air quality and address climate impacts in this sensitive region.
Jinbo Wang, Jiaping Wang, Yuxuan Zhang, Tengyu Liu, Xuguang Chi, Xin Huang, Dafeng Ge, Shiyi Lai, Caijun Zhu, Lei Wang, Qiaozhi Zha, Ximeng Qi, Wei Nie, Congbin Fu, and Aijun Ding
Atmos. Chem. Phys., 24, 11063–11080, https://doi.org/10.5194/acp-24-11063-2024, https://doi.org/10.5194/acp-24-11063-2024, 2024
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In this study, we found large spatial discrepancies in the physical and chemical properties of black carbon over the Tibetan Plateau (TP). Elevated anthropogenic emissions from low-altitude regions can significantly change the mass concentration, mixing state and chemical composition of black-carbon-containing aerosol in the TP region, further altering its light absorption ability. Our study emphasizes the vulnerability of remote plateau regions to intense anthropogenic influences.
Liyuan Zhou, Qianyun Liu, Christian M. Salvador, Michael Le Breton, Mattias Hallquist, Jian Zhen Yu, Chak K. Chan, and Åsa M. Hallquist
Atmos. Chem. Phys., 24, 11045–11061, https://doi.org/10.5194/acp-24-11045-2024, https://doi.org/10.5194/acp-24-11045-2024, 2024
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Our research on city bus emissions reveals that alternative fuels (compressed natural gas and biofuels) reduce fresh particle emissions compared to diesel. However, all fuels lead to secondary air pollution. Aiming at guiding better environmental policies, we studied 76 buses using advanced emission measurement techniques. This work sheds light on the complex effects of bus fuels on urban air quality, emphasizing the need for comprehensive evaluations of future transportation technologies.
Xu Yang, Fobang Liu, Shuqi Yang, Yuling Yang, Yanan Wang, Jingjing Li, Mingyu Zhao, Zhao Wang, Kai Wang, Chi He, and Haijie Tong
Atmos. Chem. Phys., 24, 11029–11043, https://doi.org/10.5194/acp-24-11029-2024, https://doi.org/10.5194/acp-24-11029-2024, 2024
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A study in the rural North China Plain showed environmentally persistent free radicals (EPFRs) in atmospheric particulate matter (PM), with a notable water-soluble fraction likely from atmospheric oxidation during transport. Significant positive correlations between EPFRs and the water-soluble oxidative potential of PM2.5 were found, primarily attributable to the water-soluble fractions of EPFRs. These findings emphasize understanding EPFRs' atmospheric evolution for climate and health impacts.
Kirsten N. Fossum, Chunshui Lin, Niall O'Sullivan, Lu Lei, Stig Hellebust, Darius Ceburnis, Aqeel Afzal, Anja Tremper, David Green, Srishti Jain, Steigvilė Byčenkienė, Colin O'Dowd, John Wenger, and Jurgita Ovadnevaite
Atmos. Chem. Phys., 24, 10815–10831, https://doi.org/10.5194/acp-24-10815-2024, https://doi.org/10.5194/acp-24-10815-2024, 2024
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The chemical composition and sources of submicron aerosol in the Dublin Port area were investigated over a month-long campaign. Two distinct types of ship emissions were identified and characterised: sulfate-rich plumes from the use of heavy fuel oil with scrubbers and organic-rich plumes from the use of low-sulfur fuels. The latter were more frequent, emitting double the particle number and having a typical V / Ni ratio for ship emission.
Xiao He, Xuan Zheng, Shuwen Guo, Lewei Zeng, Ting Chen, Bohan Yang, Shupei Xiao, Qiongqiong Wang, Zhiyuan Li, Yan You, Shaojun Zhang, and Ye Wu
Atmos. Chem. Phys., 24, 10655–10666, https://doi.org/10.5194/acp-24-10655-2024, https://doi.org/10.5194/acp-24-10655-2024, 2024
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This study introduces an innovative method for identifying and quantifying complex organic vapors and aerosols. By combining advanced analytical techniques and new algorithms, we categorized thousands of compounds from heavy-duty diesel vehicles and ambient air and highlighted specific tracers for emission sources. The innovative approach enhances peak identification, reduces quantification uncertainties, and offers new insights for air quality management and atmospheric chemistry.
Yu Xu, Tang Liu, Yi-Jia Ma, Qi-Bin Sun, Hong-Wei Xiao, Hao Xiao, Hua-Yun Xiao, and Cong-Qiang Liu
Atmos. Chem. Phys., 24, 10531–10542, https://doi.org/10.5194/acp-24-10531-2024, https://doi.org/10.5194/acp-24-10531-2024, 2024
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This study investigates the characteristics of aminiums and ammonium in PM2.5 on clean and polluted winter days in 11 Chinese cities, highlighting the possibility of the competitive uptake of ammonia versus amines on acidic aerosols or the displacement of aminiums by ammonia under high-ammonia conditions. The overall results deepen the understanding of the spatiotemporal differences in aminium characteristics and formation in China.
Cassidy Soloff, Taiwo Ajayi, Yonghoon Choi, Ewan C. Crosbie, Joshua P. DiGangi, Glenn S. Diskin, Marta A. Fenn, Richard A. Ferrare, Francesca Gallo, Johnathan W. Hair, Miguel Ricardo A. Hilario, Simon Kirschler, Richard H. Moore, Taylor J. Shingler, Michael A. Shook, Kenneth L. Thornhill, Christiane Voigt, Edward L. Winstead, Luke D. Ziemba, and Armin Sorooshian
Atmos. Chem. Phys., 24, 10385–10408, https://doi.org/10.5194/acp-24-10385-2024, https://doi.org/10.5194/acp-24-10385-2024, 2024
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Using aircraft measurements over the northwestern Atlantic between the US East Coast and Bermuda and trajectory modeling of continental outflow, we identify trace gas and particle properties that exhibit gradients with offshore distance and quantify these changes with high-resolution measurements of concentrations and particle chemistry, size, and scattering properties. This work furthers our understanding of the complex interactions between continental and marine environments.
Alex Rowell, James Brean, David C. S. Beddows, Zongbo Shi, Avinash Kumar, Matti Rissanen, Miikka Dal Maso, Peter Mettke, Kay Weinhold, Maik Merkel, and Roy M. Harrison
Atmos. Chem. Phys., 24, 10349–10361, https://doi.org/10.5194/acp-24-10349-2024, https://doi.org/10.5194/acp-24-10349-2024, 2024
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Ions enhance the formation and growth rates of new particles, affecting the Earth's radiation budget. Despite these effects, there is little published data exploring the sources of ions in the urban environment and their role in new particle formation (NPF). Here we show that natural ion sources dominate in urban environments, while traffic is a secondary source. Ions contribute up to 12.7 % of the formation rate of particles, indicating that they are important for forming urban PM.
Yuan Cheng, Xu-bing Cao, Sheng-qiang Zhu, Zhi-qing Zhang, Jiu-meng Liu, Hong-liang Zhang, Qiang Zhang, and Ke-bin He
Atmos. Chem. Phys., 24, 9869–9883, https://doi.org/10.5194/acp-24-9869-2024, https://doi.org/10.5194/acp-24-9869-2024, 2024
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The agreement between observational and modeling results is essential for the development of efficient air pollution control strategies. Here we constrained the modeling results of carbonaceous aerosols by field observation in Northeast China, a historically overlooked but recently targeted region of national clean-air actions. Our study suggested that the simulation of agricultural fire emissions and secondary organic aerosols remains challenging.
Yuan Dai, Junfeng Wang, Houjun Wang, Shijie Cui, Yunjiang Zhang, Haiwei Li, Yun Wu, Ming Wang, Eleonora Aruffo, and Xinlei Ge
Atmos. Chem. Phys., 24, 9733–9748, https://doi.org/10.5194/acp-24-9733-2024, https://doi.org/10.5194/acp-24-9733-2024, 2024
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Short-term strict emission control can improve air quality, but its effectiveness needs assessment. During the 2021 summer COVID-19 lockdown in Yangzhou, we found that PM2.5 levels did not decrease despite reduced primary emissions. Aged black-carbon particles increased substantially due to higher O3 levels and transported pollutants. High humidity and low wind also played key roles. The results highlight the importance of a regionally balanced control strategy for future air quality management.
Xinya Liu, Diego Alves Gouveia, Bas Henzing, Arnoud Apituley, Arjan Hensen, Danielle van Dinther, Rujin Huang, and Ulrike Dusek
Atmos. Chem. Phys., 24, 9597–9614, https://doi.org/10.5194/acp-24-9597-2024, https://doi.org/10.5194/acp-24-9597-2024, 2024
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The vertical distribution of aerosol optical properties is important for their effect on climate. This is usually measured by lidar, which has limitations, most notably the assumption of a lidar ratio. Our study shows that routine surface-level aerosol measurements are able to predict this lidar ratio reasonably well within the lower layers of the atmosphere and thus provide a relatively simple and cost-effective method to improve lidar measurements.
Weiqi Xu, Ye Kuang, Wanyun Xu, Zhiqiang Zhang, Biao Luo, Xiaoyi Zhang, Jiangchuang Tao, Hongqin Qiao, Li Liu, and Yele Sun
Atmos. Chem. Phys., 24, 9387–9399, https://doi.org/10.5194/acp-24-9387-2024, https://doi.org/10.5194/acp-24-9387-2024, 2024
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We deployed an advanced aerosol–fog sampling system at a rural site in the North China Plain to investigate impacts of aerosol hygroscopic growth and activation on the physicochemical properties of submicron aerosols. Observed results highlighted remarkably different aqueous processing of primary and secondary submicron aerosol components under distinct ambient relative humidity (RH) conditions and that RH levels significantly impact aerosol sampling through the aerosol swelling effect.
Can Wu, Xiaodi Liu, Ke Zhang, Si Zhang, Cong Cao, Jianjun Li, Rui Li, Fan Zhang, and Gehui Wang
Atmos. Chem. Phys., 24, 9263–9275, https://doi.org/10.5194/acp-24-9263-2024, https://doi.org/10.5194/acp-24-9263-2024, 2024
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Brown carbon (BrC) is prevalent in the troposphere and can efficiently absorb solar and terrestrial radiation. Our observations show that the enhanced light absorption of BrC relative to black carbon at the tropopause can be attributed to the formation of nitrogen-containing organic compounds through the aqueous-phase reactions of carbonyls with ammonium.
Taiwo Ajayi, Yonghoon Choi, Ewan C. Crosbie, Joshua P. DiGangi, Glenn S. Diskin, Marta A. Fenn, Richard A. Ferrare, Johnathan W. Hair, Miguel Ricardo A. Hilario, Chris A. Hostetler, Simon Kirschler, Richard H. Moore, Taylor J. Shingler, Michael A. Shook, Cassidy Soloff, Kenneth L. Thornhill, Christiane Voigt, Edward L. Winstead, Luke D. Ziemba, and Armin Sorooshian
Atmos. Chem. Phys., 24, 9197–9218, https://doi.org/10.5194/acp-24-9197-2024, https://doi.org/10.5194/acp-24-9197-2024, 2024
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This study uses airborne data to examine vertical profiles of trace gases, aerosol particles, and meteorological variables over a remote marine area (Bermuda). Results show distinct differences based on both air mass source region (North America, Ocean, Caribbean/North Africa) and altitude for a given air mass type. This work highlights the sensitivity of remote marine areas to long-range transport and the importance of considering the vertical dependence of trace gas and aerosol properties.
Kira Zeider, Grace Betito, Anthony Bucholtz, Peng Xian, Annette Walker, and Armin Sorooshian
Atmos. Chem. Phys., 24, 9059–9083, https://doi.org/10.5194/acp-24-9059-2024, https://doi.org/10.5194/acp-24-9059-2024, 2024
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The predominant wind direction along the California coast (northerly) reverses several times during the summer (to southerly). The effects of these wind reversals on aerosol and cloud characteristics are not well understood. Using data from multiple datasets we found that southerly flow periods had enhanced signatures of anthropogenic emissions due to shipping and continental sources, and clouds had more but smaller droplets.
Saleh Alzahrani, Doğuşhan Kılıç, Michael Flynn, Paul I. Williams, and James Allan
Atmos. Chem. Phys., 24, 9045–9058, https://doi.org/10.5194/acp-24-9045-2024, https://doi.org/10.5194/acp-24-9045-2024, 2024
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This paper investigates emissions from aviation activities at an international airport to evaluate their impact on local air quality. The study provides detailed insights into the chemical composition of aerosols and key pollutants in the airport environment. Source apportionment analysis using positive matrix factorisation (PMF) identified three significant sources: less oxidised oxygenated organic aerosol, alkane organic aerosol, and more oxidised oxygenated organic aerosol.
Mingjie Kang, Mengying Bao, Wenhuai Song, Aduburexiati Abulimiti, Fang Cao, Sönke Szidat, and Yanlin Zhang
EGUsphere, https://doi.org/10.5194/egusphere-2024-2098, https://doi.org/10.5194/egusphere-2024-2098, 2024
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Reports on the molecular level knowledge of high temporal resolution PM2.5 components on hazy days are still limited. This study investigated many individual PM2.5 species and sources. The results show biomass burning (BB) was the main source of organic carbon. Moreover, BB enhanced fungal spore emissions and secondary aerosol formation. The contribution of non-fossils increased with increasing haze pollution. These findings suggest BB may be an important driver of haze events in winter.
Mikko Heikkilä, Krista Luoma, Timo Mäkelä, and Tiia Grönholm
Atmos. Chem. Phys., 24, 8927–8941, https://doi.org/10.5194/acp-24-8927-2024, https://doi.org/10.5194/acp-24-8927-2024, 2024
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Black carbon (BC) concentration was measured from 211 ship exhaust gas plumes at a remote marine station. Emission factors of BC were calculated in grams per kilogram of fuel. Ships with an exhaust gas cleaning system (EGCS) were found to have median BC emissions per fuel consumed 5 times lower than ships without an EGCS. However, this might be because of non-EGCS ships running at low engine loads rather than the EGCS itself. A local speed restriction would increase BC emissions of ships.
Olga Zografou, Maria Gini, Prodromos Fetfatzis, Konstantinos Granakis, Romanos Foskinis, Manousos Ioannis Manousakas, Fotios Tsopelas, Evangelia Diapouli, Eleni Dovrou, Christina N. Vasilakopoulou, Alexandros Papayannis, Spyros N. Pandis, Athanasios Nenes, and Konstantinos Eleftheriadis
Atmos. Chem. Phys., 24, 8911–8926, https://doi.org/10.5194/acp-24-8911-2024, https://doi.org/10.5194/acp-24-8911-2024, 2024
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Characterization of PM1 and positive matrix factorization (PMF) source apportionment of organic and inorganic fractions were conducted at the high-altitude station (HAC)2. Cloud presence reduced PM1, affecting sulfate more than organics. Free-troposphere (FT) conditions showed more black carbon (eBC) than planetary boundary layer (PBL) conditions.
Yuanyuan Qin, Xinghua Zhang, Wei Huang, Juanjuan Qin, Xiaoyu Hu, Yuxuan Cao, Tianyi Zhao, Yang Zhang, Jihua Tan, Ziyin Zhang, Xinming Wang, and Zhenzhen Wang
Atmos. Chem. Phys., 24, 8737–8750, https://doi.org/10.5194/acp-24-8737-2024, https://doi.org/10.5194/acp-24-8737-2024, 2024
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Environmental persistent free radicals (EPFRs) and reactive oxygen species (ROSs) play an active role in the atmosphere. Despite control measures having effectively reduced their emissions, reductions were less than in PM2.5. Emission control measures performed well in achieving Parade Blue, but reducing the impact of the atmosphere on human health remains challenging. Thus, there is a need to reassess emission control measures to better address the challenges posed by EPFRs and ROSs.
Fenghua Wei, Xing Peng, Liming Cao, Mengxue Tang, Ning Feng, Xiaofeng Huang, and Lingyan He
Atmos. Chem. Phys., 24, 8507–8518, https://doi.org/10.5194/acp-24-8507-2024, https://doi.org/10.5194/acp-24-8507-2024, 2024
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The water solubility of secondary organic aerosols (SOAs) is a crucial factor in determining their hygroscopicity and climatic impact. Stable carbon isotope and mass spectrometry techniques were combined to assess the water solubility of SOAs with different aging degrees in a coastal megacity in China. This work revealed a much higher water-soluble fraction of aged SOA compared to fresh SOA, indicating that the aging degree of SOA has considerable impacts on its water solubility.
Zijun Zhang, Weiqi Xu, Yi Zhang, Wei Zhou, Xiangyu Xu, Aodong Du, Yinzhou Zhang, Hongqin Qiao, Ye Kuang, Xiaole Pan, Zifa Wang, Xueling Cheng, Lanzhong Liu, Qingyan Fu, Douglas R. Worsnop, Jie Li, and Yele Sun
Atmos. Chem. Phys., 24, 8473–8488, https://doi.org/10.5194/acp-24-8473-2024, https://doi.org/10.5194/acp-24-8473-2024, 2024
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We investigated aerosol composition and sources and the interaction between secondary organic aerosol (SOA) and clouds at a regional mountain site in southeastern China. Clouds efficiently scavenge more oxidized SOA; however, cloud evaporation leads to the production of less oxidized SOA. The unexpectedly high presence of nitrate in aerosol particles indicates that nitrate formed in polluted areas has undergone interactions with clouds, significantly influencing the regional background site.
Feifei Li, Shanshan Tang, Jitao Lv, Shiyang Yu, Xu Sun, Dong Cao, Yawei Wang, and Guibin Jiang
Atmos. Chem. Phys., 24, 8397–8411, https://doi.org/10.5194/acp-24-8397-2024, https://doi.org/10.5194/acp-24-8397-2024, 2024
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Targeted derivatization and non-targeted analysis with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) were used to reveal the molecular composition of carbonyl molecules in PM2.5, and the important role of carbonyls in increasing the oxidative potential of organic aerosol was found in real samples.
Adam E. Thomas, Hayley S. Glicker, Alex B. Guenther, Roger Seco, Oscar Vega Bustillos, Julio Tota, Rodrigo A. F. Souza, and James N. Smith
EGUsphere, https://doi.org/10.5194/egusphere-2024-2230, https://doi.org/10.5194/egusphere-2024-2230, 2024
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We present measurements of the composition of ultrafine particles collected from the eastern Amazon, a relatively understudied region that is subjected to increasing human influence. We find that while isoprene chemistry is likely significant to ultrafine particle growth throughout the year, compounds related to other sources such as biological spore emissions and biomass burning exhibit striking seasonal differences, implying an extensive variation in regional ultrafine particle sources.
Maya Abou-Ghanem, Daniel M. Murphy, Gregory P. Schill, Michael J. Lawler, and Karl D. Froyd
Atmos. Chem. Phys., 24, 8263–8275, https://doi.org/10.5194/acp-24-8263-2024, https://doi.org/10.5194/acp-24-8263-2024, 2024
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Using particle analysis by laser mass spectrometry, we examine vanadium-containing ship exhaust particles measured on NASA's DC-8 during the Atmospheric Tomography Mission (ATom). Our results reveal ship exhaust particles are sufficiently widespread in the marine atmosphere and experience atmospheric aging. Finally, we use laboratory calibrations to determine the vanadium, sulfate, and organic single-particle mass fractions of vanadium-containing ship exhaust particles.
Cassandra J. Gaston, Joseph M. Prospero, Kristen Foley, Havala O. T. Pye, Lillian Custals, Edmund Blades, Peter Sealy, and James A. Christie
Atmos. Chem. Phys., 24, 8049–8066, https://doi.org/10.5194/acp-24-8049-2024, https://doi.org/10.5194/acp-24-8049-2024, 2024
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To understand how changing emissions have impacted aerosols in remote regions, we measured nitrate and sulfate in Barbados and compared them to model predictions from EPA’s Air QUAlity TimE Series (EQUATES). Nitrate was stable, except for spikes in 2008 and 2010 due to transported smoke. Sulfate decreased in the 1990s due to reductions in sulfur dioxide (SO2) in the US and Europe; then it increased in the 2000s, likely due to anthropogenic emissions from Africa.
Jie Zhang, Tianyu Zhu, Alexandra Catena, Yaowei Li, Margaret Schwab, Pengfei Liu, Akua Asa-Awuku, and James Schwab
EGUsphere, https://doi.org/10.5194/egusphere-2024-1390, https://doi.org/10.5194/egusphere-2024-1390, 2024
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This study shows the derived organic aerosol hygroscopicity under high humidity conditions based on a simple optical scatter monitor system, including two nephelometric monitors (pDR-1500), after knowing the aerosol chemical composition.
Jiao Xue, Tian Zhang, Keyhong Park, Jinpei Yan, Young Jun Yoon, Jiyeon Park, and Bingbing Wang
Atmos. Chem. Phys., 24, 7731–7754, https://doi.org/10.5194/acp-24-7731-2024, https://doi.org/10.5194/acp-24-7731-2024, 2024
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Ice formation by particles is an important way of making mixed-phase and ice clouds. We found that particles collected in the marine atmosphere exhibit diverse ice nucleation abilities and mixing states. Sea salt mixed-sulfate particles were enriched in ice-nucleating particles. Selective aging on sea salt particles made particle populations more externally mixed. Characterizations of particles and their mixing state are needed for a better understanding of aerosol–cloud interactions.
Yangzhi Mo, Jun Li, Guangcai Zhong, Sanyuan Zhu, Shizhen Zhao, Jiao Tang, Hongxing Jiang, Zhineng Cheng, Chongguo Tian, Yingjun Chen, and Gan Zhang
Atmos. Chem. Phys., 24, 7755–7772, https://doi.org/10.5194/acp-24-7755-2024, https://doi.org/10.5194/acp-24-7755-2024, 2024
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In this study, we found that biomass burning (31.0 %) and coal combustion (31.1 %) were the dominant sources of water-insoluble organic carbon in China, with coal combustion sources exhibiting the strongest light-absorbing capacity. Additionally, we propose a light-absorbing carbonaceous continuum, revealing that components enriched with fossil sources tend to have stronger light-absorbing capacity, higher aromaticity, higher molecular weights, and greater recalcitrance in the atmosphere.
Jing Duan, Ru-Jin Huang, Ying Wang, Wei Xu, Haobin Zhong, Chunshui Lin, Wei Huang, Yifang Gu, Jurgita Ovadnevaite, Darius Ceburnis, and Colin O'Dowd
Atmos. Chem. Phys., 24, 7687–7698, https://doi.org/10.5194/acp-24-7687-2024, https://doi.org/10.5194/acp-24-7687-2024, 2024
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The chemical composition of atmospheric particles has shown significant changes in recent years. We investigated the potential effects of changes in inorganics on aerosol water uptake and, thus, secondary organic aerosol formation in wintertime haze based on the size-resolved measurements of non-refractory fine particulate matter (NR-PM2.5) in Xi’an, northwestern China. We highlight the key role of aerosol water as a medium to link inorganics and organics in their multiphase processes.
Hongyong Li, Xiaopu Lyu, Likun Xue, Yunxi Huo, Dawen Yao, Haoxian Lu, and Hai Guo
Atmos. Chem. Phys., 24, 7085–7100, https://doi.org/10.5194/acp-24-7085-2024, https://doi.org/10.5194/acp-24-7085-2024, 2024
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Organic aerosol is ubiquitous in the atmosphere and largely explains the gap between current levels of fine particulate matter in many cities and the World Health Organization guideline values. This study highlights the dominant contributions of cooking emissions to organic aerosol when marine air prevailed in Hong Kong, which were occasionally overwhelmed by aromatics-derived secondary organic aerosol in continental ouflows.
Shao Shi, Jinghao Zhai, Xin Yang, Yechun Ruan, Yuanlong Huang, Xujian Chen, Antai Zhang, Jianhuai Ye, Guomao Zheng, Baohua Cai, Yaling Zeng, Yixiang Wang, Chunbo Xing, Yujie Zhang, Tzung-May Fu, Lei Zhu, Huizhong Shen, and Chen Wang
Atmos. Chem. Phys., 24, 7001–7012, https://doi.org/10.5194/acp-24-7001-2024, https://doi.org/10.5194/acp-24-7001-2024, 2024
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The determination of ions in the mass spectra of individual particles remains uncertain. We have developed a standard-free mass calibration algorithm applicable to more than 98 % of ambient particles. With our algorithm, ions with ~ 0.05 Th mass difference could be determined. Therefore, many more atmospheric species could be determined and involved in the source apportionment of aerosols, the study of chemical reaction mechanisms, and the analysis of single-particle mixing states.
Wei Sun, Xiaodong Hu, Yuzhen Fu, Guohua Zhang, Yujiao Zhu, Xinfeng Wang, Caiqing Yan, Likun Xue, He Meng, Bin Jiang, Yuhong Liao, Xinming Wang, Ping'an Peng, and Xinhui Bi
Atmos. Chem. Phys., 24, 6987–6999, https://doi.org/10.5194/acp-24-6987-2024, https://doi.org/10.5194/acp-24-6987-2024, 2024
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The formation pathways of nitrogen-containing compounds (NOCs) in the atmosphere remain unclear. We investigated the composition of aerosols and fog water by state-of-the-art mass spectrometry and compared the formation pathways of NOCs. We found that NOCs in aerosols were mainly formed through nitration reaction, while ammonia addition played a more important role in fog water. The results deepen our understanding of the processes of organic particulate pollution.
Fuzhen Shen, Michaela I. Hegglin, and Yue Yuan
Atmos. Chem. Phys., 24, 6539–6553, https://doi.org/10.5194/acp-24-6539-2024, https://doi.org/10.5194/acp-24-6539-2024, 2024
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We attempt to use a novel structural self-organising map and machine learning models to identify a weather system and quantify the importance of each meteorological factor in driving the unexpected PM2.5 and O3 changes under the specific weather system during the COVID-19 lockdown in China. The result highlights that temperature under the double-centre high-pressure system plays the most crucial role in abnormal events.
Wenshuai Li, Yuxuan Qi, Yingchen Liu, Guanru Wu, Yanjing Zhang, Jinhui Shi, Wenjun Qu, Lifang Sheng, Wencai Wang, Daizhou Zhang, and Yang Zhou
Atmos. Chem. Phys., 24, 6495–6508, https://doi.org/10.5194/acp-24-6495-2024, https://doi.org/10.5194/acp-24-6495-2024, 2024
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Aerosol particles from mainland can transport to oceans and deposit, providing soluble Fe and affecting phytoplankton growth. Thus, we studied the dissolution process of aerosol Fe and found that photochemistry played a key role in promoting Fe dissolution in clean conditions. RH-dependent reactions were more influential in slightly polluted conditions. These results highlight the distinct roles of two weather-related parameters (radiation and RH) in influencing geochemical cycles related to Fe.
Yanqin Ren, Zhenhai Wu, Yuanyuan Ji, Fang Bi, Junling Li, Haijie Zhang, Hao Zhang, Hong Li, and Gehui Wang
Atmos. Chem. Phys., 24, 6525–6538, https://doi.org/10.5194/acp-24-6525-2024, https://doi.org/10.5194/acp-24-6525-2024, 2024
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Nitrated aromatic compounds (NACs) and oxygenated derivatives of polycyclic aromatic hydrocarbons (OPAHs) in PM2.5 were examined from an urban area in Beijing during the autumn and winter. The OPAH and NAC concentrations were much higher during heating than before heating. They majorly originated from the combustion of biomass and automobile emissions, and the secondary generation was the major contributor throughout the whole sampling period.
Gregory P. Schill, Karl D. Froyd, Daniel M. Murphy, Christina J. Williamson, Charles Brock, Tomás Sherwen, Mat J. Evans, Eric A. Ray, Eric C. Apel, Rebecca S. Hornbrook, Alan J. Hills, Jeff Peischl, Tomas B. Ryerson, Chelsea R. Thompson, Ilann Bourgeois, Donald R. Blake, Joshua P. DiGangi, and Glenn S. Diskin
EGUsphere, https://doi.org/10.5194/egusphere-2024-1399, https://doi.org/10.5194/egusphere-2024-1399, 2024
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Using single-particle mass spectrometry, we show that trace concentrations of bromine and iodine are ubiquitous in remote tropospheric aerosol, and suggest that aerosols are an important part of the global reactive iodine budget. Comparisons to a global climate model with detailed iodine chemistry are favorable in the background atmosphere; however, the model cannot replicate our measurements near the ocean surface, in biomass burning plumes, and in the stratosphere.
Marco Paglione, David C. S. Beddows, Anna Jones, Thomas Lachlan-Cope, Matteo Rinaldi, Stefano Decesari, Francesco Manarini, Mara Russo, Karam Mansour, Roy M. Harrison, Andrea Mazzanti, Emilio Tagliavini, and Manuel Dall'Osto
Atmos. Chem. Phys., 24, 6305–6322, https://doi.org/10.5194/acp-24-6305-2024, https://doi.org/10.5194/acp-24-6305-2024, 2024
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Applying factor analysis techniques to H-NMR spectra, we present the organic aerosol (OA) source apportionment of PM1 samples collected in parallel at two Antarctic stations, namely Signy and Halley, allowing investigation of aerosol–climate interactions in an unperturbed atmosphere. Our results show remarkable differences between pelagic (open-ocean) and sympagic (sea-ice-influenced) air masses and indicate that various sources and processes are controlling Antarctic aerosols.
Zhichao Dong, Chandra Mouli Pavuluri, Peisen Li, Zhanjie Xu, Junjun Deng, Xueyan Zhao, Xiaomai Zhao, Pingqing Fu, and Cong-Qiang Liu
Atmos. Chem. Phys., 24, 5887–5905, https://doi.org/10.5194/acp-24-5887-2024, https://doi.org/10.5194/acp-24-5887-2024, 2024
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Comprehensive study of optical properties of brown carbon (BrC) in fine aerosols from Tianjin, China, implied that biological emissions are major sources of BrC in summer, whereas fossil fuel combustion and biomass burning emissions are in cold periods. The direct radiation absorption caused by BrC in short wavelengths contributed about 40 % to that caused by BrC in 300–700 nm. Water-insoluble but methanol-soluble BrC contains more protein-like chromophores (PLOM) than that of water-soluble BrC.
Kumiko Goto-Azuma, Yoshimi Ogawa-Tsukagawa, Kaori Fukuda, Koji Fujita, Motohiro Hirabayashi, Remi Dallmayr, Jun Ogata, Nobuhiro Moteki, Tatsuhiro Mori, Sho Ohata, Yutaka Kondo, Makoto Koike, Sumito Matoba, and Teruo Aoki
EGUsphere, https://doi.org/10.5194/egusphere-2024-1498, https://doi.org/10.5194/egusphere-2024-1498, 2024
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Monthly records spanning 350 years from a Greenland ice core reveal trends in black carbon (BC) concentrations and sizes. BC concentrations have risen since the late 19th century due to the inflow of anthropogenic BC, with these particles being larger than those from biomass burning (BB). High BB BC concentration peaks in summer originating from BB could reduce albedo. However, BB BC showed no upward trend until the early 2000s. Our findings are crucial for validating aerosol and climate models.
Shan Wang, Kezheng Liao, Zijing Zhang, Yuk Ying Cheng, Qiongqiong Wang, Hanzhe Chen, and Jian Zhen Yu
Atmos. Chem. Phys., 24, 5803–5821, https://doi.org/10.5194/acp-24-5803-2024, https://doi.org/10.5194/acp-24-5803-2024, 2024
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In this work, hourly primary and secondary organic carbon were estimated by a novel Bayesian inference approach in suburban Hong Kong. Their multi-temporal-scale variations and evolution characteristics during PM2.5 episodes were examined. The methodology could serve as a guide for other locations with similar monitoring capabilities. The observation-based results are helpful for understanding the evolving nature of secondary organic aerosols and refining the accuracy of model simulations.
Andreas Aktypis, Dontavious Sippial, Christina Vasilakopoulou, Angeliki Matrali, Christos Kaltsonoudis, Andrea Simonati, Marco Paglione, Matteo Rinaldi, Stefano Decesari, and Spyros Pandis
EGUsphere, https://doi.org/10.5194/egusphere-2024-1317, https://doi.org/10.5194/egusphere-2024-1317, 2024
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A dual chamber system was deployed in two different environments (Po Valley, Italy and Pertouli forest, Greece) to study the potential of ambient air directly injected into the chambers, to form secondary aerosol. In the Po Valley, the system reacts rapidly forming large amounts of SOA, while in Pertouli the corresponding SOA formation chemistry appears to have been practically terminated before the beginning of most experiments, so there is little additional SOA formation potential left.
Mingfu Cai, Chenshuo Ye, Bin Yuan, Shan Huang, E Zheng, Suxia Yang, Zelong Wang, Yi Lin, Tiange Li, Weiwei Hu, Wei Chen, Qicong Song, Wei Li, Yuwen Peng, Baolin Liang, Qibin Sun, Jun Zhao, Duohong Chen, Jiaren Sun, Zhiyong Yang, and Min Shao
EGUsphere, https://doi.org/10.5194/egusphere-2024-887, https://doi.org/10.5194/egusphere-2024-887, 2024
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This study investigated the daytime secondary organic aerosol (SOA) formation in urban plumes. We observed a significant daytime SOA formation through gas-particle partitioning when the site was affected by urban plumes. Box model simulation indicated that urban pollutants (nitrogen oxide and volatile organic compounds) could enhance the oxidizing capacity, while the elevated volatile organic compounds were mainly responsible for promoting daytime SOA formation.
Cited articles
Alexander, B., Sherwen, T., Holmes, C. D., Fisher, J. A., Chen, Q., Evans, M. J., and Kasibhatla, P.:
Global inorganic nitrate production mechanisms: comparison of a global model with nitrate isotope observations, Atmos. Chem. Phys., 20, 3859–3877, https://doi.org/10.5194/acp-20-3859-2020, 2020.
Begum, B. A., Biswas, S. K., and Hopke, P. K.:
Key issues in controlling air pollutants in Dhaka, Bangladesh, Atmos. Environ., 45, 7705–7713, https://doi.org/10.1016/j.atmosenv.2010.10.022, 2011.
Beloconi, A., Probst-Hensch, N. M., and Vounatsou, P.:
Spatio-temporal modelling of changes in air pollution exposure associated to the COVID-19 lockdown measures across Europe, Sci. Total Environ., 787, 147607, https://doi.org/10.1016/j.scitotenv.2021.147607, 2021.
Bi, X., Dai, Q., Wu, J., Zhang, Q., Zhang, W., Luo, R., Cheng, Y., Zhang, J., Wang, L., Yu, Z., Zhang, Y., Tian, Y., and Feng, Y.:
Characteristics of the main primary source profiles of particulate matter across China from 1987 to 2017, Atmos. Chem. Phys., 19, 3223–3243, https://doi.org/10.5194/acp-19-3223-2019, 2019.
Bie, S. J., Yang, L. X., Zhang, Y., Huang, Q., Li, J. S., Zhao, T., Zhang, X. F., Wang, P. C., and Wang, W. X.:
Source appointment of PM2.5 in Qingdao Port, East of China, Sci. Total Environ., 755, 142456, https://doi.org/10.1016/j.scitotenv.2020.142456, 2021.
Bove, M. C., Brotto, P., Calzolai, G., Cassola, F., Cavalli, F., Fermo, P., Hjorth, J., Massabò, D., Nava, S., Piazzalunga, A., Schembari, C., and Prati, P.:
PM10 source apportionment applying PMF and chemical tracer analysis to ship-borne measurements in the Western Mediterranean, Atmos. Environ., 125, 140–151, https://doi.org/10.1016/j.atmosenv.2015.11.009, 2016.
Brown, S. G., Eberly, S., Paatero, P., and Norris, G. A.:
Methods for estimating uncertainty in PMF solutions: Examples with ambient air and water quality data and guidance on reporting PMF results, Sci. Total Environ., 518, 626–635, https://doi.org/10.1016/j.scitotenv.2015.01.022, 2015.
Carslaw, D. C.:
Worldmet: Import Surface Meteorological Data from NOAA Integrated Surface Database (ISD), http://github.com/davidcarslaw/ (last access: 5 September 2018), 2017.
Chen, J. Y., Shan, M., Xia, J. J., and Jiang, Y.:
Effects of space heating on the pollutant emission intensities in “2 + 26” cities, Building Environ., 175, 106817, https://doi.org/10.1016/j.buildenv.2020.106817, 2020.
Chen, Y., Zhang, S. M., Peng, C., Shi, G. M., Tian, M., Huang, R. J., Guo, D. M., Wang, H. B., Yao, X. J., and Yang, F. M.:
Impact of the COVID-19 pandemic and control measures on air quality and aerosol light absorption in Southwestern China, Sci. Total Environ., 749, 141419, https://doi.org/10.1016/j.scitotenv.2020.141419, 2020.
Chen, X., Wang, H., Lu, K., Li, C., Zhai, T., Tan, Z., Ma, X., Yang, X., Liu, Y., Chen, S., Dong, H., Li, X., Wu, Z., Hu, M., Zeng, L., and Zhang, Y.:
Field Determination of Nitrate Formation Pathway in Winter Beijing, Environ. Sci. Technol., 54, 9243–9253, https://doi.org/10.1021/acs.est.0c00972, 2020.
Cheng, N. L., Cheng, B. F., Li, S. S., and Ning, T. Z.:
Effects of meteorology and emission reduction measures on air pollution in Beijing during heating seasons, Atmos. Pollut. Res., 10, 971–979, https://doi.org/10.1016/j.apr.2019.01.005, 2019.
Choi, J.-K., Heo, J.-B., Ban, S.-J., Yi, S.-M., and Zoh, K.-D.:
Source apportionment of PM2.5 at the coastal area in Korea, Sci. Total Environ., 447, 370–380, https://doi.org/10.1016/j.scitotenv.2012.12.047, 2013.
Chu, B. W., Zhang, S. P., Liu, J., Ma, Q. X., and He, H.:
Significant concurrent decrease in PM2.5 and NO2 concentrations in China during COVID-19 epidemic, J. Environ. Sci., 99, 346–353, https://doi.org/10.1016/j.jes.2020.06.031, 2021.
Cohen, A. J., Brauer, M., Burnett, R., Anderson, H. R., Frostad, J., Estep, K., Balakrishnan, K., Brunekreef, B., Dandona, L., Dandona, R., Feigin, V., Freedman, G., Hubbell, B., Jobling, A., Kan, H., Knibbs, L., Liu, Y., Martin, R., Morawska, L., Pope, C. A., Shin, H., Straif, K., Shaddick, G., Thomas, M., van Dingenen, R., van Donkelaar, A., Vos, T., Murray, C. J. L., and Forouzanfar, M. H.:
Estimates and 25-year trends of the global burden of disease attributable to ambient air pollution: an analysis of data from the Global Burden of Diseases Study 2015, Lancet, 389, 1907–1918, https://doi.org/10.1016/S0140-6736(17)30505-6, 2017.
Collivignarelli, M. C., De Rose, C., Abbà, A., Baldi, M., Bertanza, G., Pedrazzani, R., Sorlini, S., and Carnevale Miino, M.:
Analysis of lockdown for COVID-19 impact on NO2 in London, Milan and Paris: What lesson can be learnt?, Process Saf. Environ., 146, 952–960, https://doi.org/10.1016/j.psep.2020.12.029, 2021.
Cucciniello, R., Raia, L., and Vasca, E.:
Air quality evaluation during COVID-19 in Southern Italy: the case study of Avellino city, Environ. Res., 203, 111803, https://doi.org/10.1016/j.envres.2021.111803, 2022.
Dall'Osto, M., Booth, M. J., Smith, W., Fisher, R., and Harrison, R. M.:
A study of the size distributions and the chemical characterization of airborne particles in the vicinity of a large integrated steelworks, Aerosol Sci. Technol., 42, 981–991, https://doi.org/10.1080/02786820802339587, 2008.
Dai, Q. L., Liu, B. S., Bi, X. H., Wu, J. H., Liang, D. N., Zhang, Y. F., Feng, Y. C., and Hopke, P. K.:
Dispersion Normalized PMF Provides Insights into the Significant Changes in Source Contributions to PM2.5 after the COVID-19 Outbreak, Environ. Sci. Technol., 54, 9917–9927, https://doi.org/10.1021/acs.est.0c02776, 2020.
Dai, Q. L., Ding, J., Hou, L. L., Li, L. X., Cai, Z. Y., Liu, B. S., Song, C. B., Bi, X. H., Wu, J. H., Zhang, Y. F., Feng, Y. C., and Hopke, P. K.:
Haze episodes before and during the COVID-19 shutdown in Tianjin, China: Contribution of fireworks and residential burning, Environ. Pollut., 286, 117252, https://doi.org/10.1016/j.envpol.2021.117252, 2021.
Ding, J., Dai, Q. L., Li, Y. F., Han, S. Q., Zhang, Y. F., and Feng, Y. C.:
Impact of meteorological condition changes on air quality and particulate chemical composition during the COVID-19 lockdown, J. Environ. Sci., 109, 45–56, https://doi.org/10.1016/j.jes.2021.02.022, 2021.
Esmaeilirad, S., Lai, A., Abbaszade, G., Schnelle-Kreis, J., Zimmermann, R., Uzu, G., Daellenbach, K., Canonaco, F., Hassankhany, H., Arhami, M., Baltensperger, U., Prévôt, A. S. H., Schauer, J. J., Jaffrezo, J.-L., Hosseini, V., and El Haddad, I.:
Source apportionment of fine particulate matter in a Middle Eastern Metropolis, Tehran-Iran, using PMF with organic and inorganic markers, Sci. Total Environ., 705, 135330, https://doi.org/10.1016/j.scitotenv.2019.135330, 2020.
Fan, H., Zhao, C. F., and Yang, Y. K.:
A comprehensive analysis of the spatio-temporal variation of urban air pollution in China during 2014–2018, Atmos. Environ., 220, 117066, https://doi.org/10.1016/j.atmosenv.2019.117066, 2020.
Fu, X., Wang, T., Gao, J., Wang, P., Liu, Y. M., Wang, S. X., Zhao, B., and Xue, L. K.:
Persistent Heavy Winter Nitrate Pollution Driven by Increased Photochemical Oxidants in Northern China, Environ. Sci. Technol., 54, 3881–3889, https://doi.org/10.1021/acs.est.9b07248, 2020.
Gao, J., Peng, X., Chen, G., Xu, J., Shi, G. L., Zhang, Y. C., and Feng, Y. C.:
Insights into the chemical characterization and sources of PM2.5 in Beijing at a 1-h time resolution, Sci. Total Environ., 542, 162–171, https://doi.org/10.1016/j.scitotenv.2015.10.082, 2016.
Gao, Y., Shan, H. Y., Zhang, S. Q., Sheng, L. F., Li, J. P., Zhang, J. X., Ma, M. C., Meng, H., Luo, K., Gao, H. W., and Yao, X. H.:
Characteristics and sources of PM2.5 with focus on two severe pollution events in a coastal city of Qingdao, China, Chemosphere, 247, 125861, https://doi.org/10.1016/j.chemosphere.2020.125861, 2020.
Grange, S. K. and Carslaw, D. C.:
Using meteorological normalization to detect interventions in air quality time series, Sci. Total Environ., 653, 578–588, https://doi.org/10.1016/j.scitotenv.2018.10.344, 2019.
Grange, S. K., Carslaw, D. C., Lewis, A. C., Boleti, E., and Hueglin, C.:
Random forest meteorological normalisation models for Swiss PM10 trend analysis, Atmos. Chem. Phys., 18, 6223–6239, https://doi.org/10.5194/acp-18-6223-2018, 2018.
Gong, S. L., Zhang, L., Liu, C., Lu, S. H., Pan, W. J., and Zhang, Y. H.:
Multi-scale analysis of the impacts of meteorology and emissions on PM2.5 and O3 trends at various regions in China from 2013 to 2020 2. Key weather elements and emissions, Sci. Total Environ., 824, 153847, https://doi.org/10.1016/j.scitotenv.2022.153847, 2022.
Gulia, S., Mittal, A., and Khare, M.:
Quantitative evaluation of source interventions for urban air quality improvement – A case study of Delhi city, Atmos. Pollut. Res., 9, 577–583, https://doi.org/10.1016/j.apr.2017.12.003, 2018.
He, G. J., Pan, Y. H., and Tanaka, T.:
The short-term impacts of COVID-19 lockdown on urban air pollution in China, Nat. Sustainability, 3, 1005–1011, https://doi.org/10.1038/s41893-020-0581-y, 2020.
Hong, Y. W., Xu, X. B., Liao, D., Zheng, R. H., Ji, X. T., Chen, Y. T., Xu, L. L., Li, M. R., Wang, H., Xiao, H., Choi, S. D., and Chen, J. S.:
Source apportionment of PM2.5 and sulfate formation during the COVID-19 lockdown in a coastal city of southeast China, Environ. Pollut., 286, 117577, https://doi.org/10.1016/j.envpol.2021.117577, 2021.
Hopke, P. K., Dai, Q. L., Li, L. X., and Feng, Y. C.:
Global review of recent source apportionments for airborne particulate matter, Sci. Total Environ., 740, 140091, https://doi.org/10.1016/j.scitotenv.2020.140091, 2020.
Hou, L. L., Dai, Q. L., Song, C. B., Liu, B., Guo, F. Z., Dai, T. J., Li, L. X., Liu, B. S., Bi, X. H., Zhang, Y. F., and Feng, Y. C.:
Revealing drivers of haze pollution by explainable machine learning, Environ. Sci. Tech. Let., 9, 112–119, https://doi.org/10.1021/acs.estlett.1c00865, 2022.
Huang, H. Y., Liu, B. S., Li, S., Choe, T.-H., Dai, Q. L., Gu, Y., Diao, L. L., Zhang, S. F., Bi, X. H., Luo, Z. W., Lu, M. M., Zhang, Y. F., and Feng, Y. C.:
An estimation method for regional transport contributions from emission sources based on a high-mountain site: a case study in Zhumadian, China, Atmos. Environ., 263, 118664, https://doi.org/10.1016/j.atmosenv.2021.118664, 2021.
Huang, J., Pan, X. C., Guo, X. B., and Li, G. X.:
2018. Health impact of China's Air Pollution Prevention and Control Action Plan: an analysis of national air quality monitoring and mortality data, Lancet Planetary Health, 2, e313–e323, https://doi.org/10.1016/S2542-5196(18)30141-4, 2018.
Huang, R. J., Zhang, Y. L., Bozzetti, C., Ho, K. F., Cao, J. J., Han, Y. M., Daellenbach, K. R., Slowik, J. G., Platt, S. M., Canonaco, F., Zotter, P., Wolf, R., Pieber, S. M., Bruns, E. A., Crippa, M., Ciarelli, G., Piazzalunga, A., Schwikowski, M., Abbaszade, G., Schnelle-Kreis, J., Zimmermann, R., An, Z. S., Szidat, S., Baltensperger, U., El Haddad, I., and Prevot, A. S. H.:
High secondary aerosol contribution to particulate pollution during haze events in China, Nature, 514, 218–222, https://doi.org/10.1038/nature13774, 2014.
Huang, X., Liu, Z., Liu, J., Hu, B., Wen, T., Tang, G., Zhang, J., Wu, F., Ji, D., Wang, L., and Wang, Y.:
Chemical characterization and source identification of PM2.5 at multiple sites in the Beijing–Tianjin–Hebei region, China, Atmos. Chem. Phys., 17, 12941–12962, https://doi.org/10.5194/acp-17-12941-2017, 2017.
Iyer, U. S. and Raj, P. E.:
Ventilation coefficient trends in the recent decades over four major Indian metropolitan cities, J. Earth Syst. Sci., 122, 537–549, https://doi.org/10.1007/s12040-013-0270-6, 2013.
Jain, S., Sharma, S. K., Mandal, T. K., and Saxena, M.:
Source apportionment of PM10 in Delhi, India using PCA/APCS, UNMIX and PMF, Particuology, 37, 107–118, https://doi.org/10.1016/j.partic.2017.05.009, 2018.
Jain, S., Sharma, S. K., Vijayan, N., and Mandal, T. K.:
Seasonal characteristics of aerosols (PM2.5 and PM10) and their source apportionment using PMF: A four year study over Delhi, India, Environ. Pollut., 262, 114337, https://doi.org/10.1016/j.envpol.2020.114337, 2020.
Jiang, X., Li, G. L., and Fu, W.:
Government environmental governance, structural adjustment and air quality: A quasi-natural experiment based on the Three-year Action Plan to Win the Blue Sky Defense War, J. Environ. Manage., 277, 111470, https://doi.org/10.1016/j.jenvman.2020.111470, 2021.
Joshi, P., Ghosh, S., Dey, S., Dixit, K., Choudhary, R. K., Salve, H. R., and Balakrishnan, K.:
Impact of acute exposure to ambient PM2.5 on non-trauma all-cause mortality in the megacity Delhi, Atmos. Environ., 259, 118548, https://doi.org/10.1016/j.atmosenv.2021.118548, 2021.
Kleinman, M. T., Kneip, T. J., and Eisenbud, M.:
Seasonal patterns of airborne particulate concentrations in New York City, Atmos. Environ. (1967), 10, 9–11, https://doi.org/10.1016/0004-6981(76)90252-3, 1976.
Kuo, S.-C., Hsieh, L.-Y., Tsai, C.-H., and Tsai, Y. I.:
Characterization of PM2.5 fugitive metal in the workplaces and the surrounding environment of a secondary aluminum smelter, Atmos. Environ., 41, 6884–6900, https://doi.org/10.1016/j.atmosenv.2007.04.038, 2007.
Le, T. H., Wang, Y., Liu, L., Yang, J. N., Yung, Y. L., Li, G. H., and Seinfeld, J. H.:
Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China, Science, 369, 702, https://doi.org/10.1126/science.abb7431, 2020.
Li, H., You, S. J., Zhang, H., Zheng, W. D., and Zou, L. J.:
Analysis of the impacts of heating emissions on the environment and human health in North China, J. Clean Prod., 207, 728–742, https://doi.org/10.1016/j.jclepro.2018.10.013, 2019.
Li, K., Jacob, D. J., Liao, H., Zhu, J., Shah, V., Shen, L., Bates, K. H., Zhang, Q., and Zhai, S. X.:
A two-pollutant strategy for improving ozone and particulate air quality in China, Nat. Geosci., 12, 906–910, https://doi.org/10.1038/s41561-019-0464-x, 2019.
Li, K., Jacob, D. J., Shen, L., Lu, X., De Smedt, I., and Liao, H.:
Increases in surface ozone pollution in China from 2013 to 2019: anthropogenic and meteorological influences, Atmos. Chem. Phys., 20, 11423–11433, https://doi.org/10.5194/acp-20-11423-2020, 2020.
Li, L. Y., Yan, D. Y., Xu, S. H., Huang, M. L., Wang, X. X., and Xie, S. D.:
Characteristics and source distribution of air pollution in winter in Qingdao, eastern China, Environ. Pollut., 224, 44–53, https://doi.org/10.1016/j.envpol.2016.12.037, 2017.
Li, W. J., Shao, L. Y., Wang, W. H., Li, H., Wang, X. M., Li, Y. W., Li, W. J., Jones, T., and Zhang, D. Z.:
Air quality improvement in response to intensified control strategies in Beijing during 2013–2019, Sci. Total Environ., 744, 140776, https://doi.org/10.1016/j.scitotenv.2020.140776, 2020.
Li, Y., Miao, Y. C., Che, H. Z., and Liu, S. H.:
On the heavy aerosol pollution and its meteorological dependence in Shandong province, China, Atmos. Res., 256, 105572, https://doi.org/10.1016/j.atmosres.2021.105572, 2021a.
Li, Y., Xu, H. X., Tang, K. Y., Lau, A. K. H., Fung, J. C. H., and Zhang, X. G.:
An ensemble assessment of the effectiveness of vehicular emission control programs for air quality improvement in Hong Kong, Atmos. Environ., 262, 118571, https://doi.org/10.1016/j.atmosenv.2021.118571, 2021b.
Liang, X., Li, S., Zhang, S. Y., Huang, H., and Chen, S. X.:
PM2.5 data reliability, consistency, and air quality assessment in five Chinese cities, J. Geophys. Res.-Atmos., 121, 10220–10236, https://doi.org/10.1002/2016JD024877, 2016.
Liu, B. S., Song, N., Dai, Q. L., Mei, R. B., Sui, B. H., Bi, X. H., and Feng, Y. C.:
Chemical composition and source apportionment of ambient PM2.5 during the non-heating period in Taian, China, Atmos. Res., 170, 23–33, https://doi.org/10.1016/j.atmosres.2015.11.002, 2016.
Liu, B., Cheng, Y., Zhou, M., Liang, D., Dai, Q., Wang, L., Jin, W., Zhang, L., Ren, Y., Zhou, J., Dai, C., Xu, J., Wang, J., Feng, Y., and Zhang, Y.:
Effectiveness evaluation of temporary emission control action in 2016 in winter in Shijiazhuang, China, Atmos. Chem. Phys., 18, 7019–7039, https://doi.org/10.5194/acp-18-7019-2018, 2018.
Liu, B. S., Wu, J. H., Wang, J., Shi, L. Y., Meng, H., Dai, Q. L., Wang, J., Song, C. B., Zhang, Y. F., Feng, Y. C., and Hopke, P. K.:
Chemical characteristics and sources of ambient PM2.5 in a harbor area: Quantification of health risks to workers from source-specific selected toxic elements, Environ. Pollut., 268, 115926, https://doi.org/10.1016/j.envpol.2020.115926, 2021.
Liu, C., Xu, R., Zhang, T. H., Zhang, H. D., Zhang, B. H., Cong, C. H., and Wu, J. Y.:
Analysis of Ozone Pollution Characteristics and Its Sources During the Shanghai Cooperation Organization Summit in Qingdao, Meteor. Environ. Sci., 43, 51–58, https://doi.org/10.16765/j.cnki.1673-7148.2020.03.007, 2020a (in Chinese).
Liu, C., Zhang, H. D., Zhang, T. H., Xu, R., Zhang, B. H., Lu, M. Y., and Li, G. H.:
The causes of ozone concentration growth in the night during the “Shanghai Cooperation Organization Summit” in Qingdao, China Environ. Sci., 40, 3332–3341, https://doi.org/10.19674/j.cnki.issn1000-6923.2020.0372, 2020b (in Chinese).
Liu, F., Beirle, S., Zhang, Q., van der A, R. J., Zheng, B., Tong, D., and He, K.:
NOx emission trends over Chinese cities estimated from OMI observations during 2005 to 2015, Atmos. Chem. Phys., 17, 9261–9275, https://doi.org/10.5194/acp-17-9261-2017, 2017.
Liu, M., Huang, Y., Ma, Z., Jin, Z., Liu, X., Wang, H., Liu, Y., Wang, J., Jantunen, M., Bi, J. and Kinney, P. L.:
Spatial and temporal trends in the mortality burden of air pollution in China: 2004–2012, Environ. Int., 98, 75–81, https://doi.org/10.1016/j.envint.2016.10.003, 2017.
Liu, W. J., Xu, Y. S., Liu, W. X., Liu, Q. Y., Yu, S. Y., Liu, Y., Wang, X., and Tao, S.:
Oxidative potential of ambient PM2.5 in the coastal cities of the Bohai Sea, northern China: Seasonal variation and source apportionment, Environ. Pollut., 236, 514–528, https://doi.org/10.1016/j.envpol.2018.01.116, 2018.
Lyu, X. P., Zeng, L. W., Guo, H., Simpson, I. J., Ling, Z. H., Wang, Y., Murray, F., Louie, P. K. K., Saunders, S. M., Lam, S. H. M., and Blake, D. R.:
Evaluation of the effectiveness of air pollution control measures in Hong Kong, Environ. Pollut., 220, 87–94, https://doi.org/10.1016/j.envpol.2016.09.025, 2017.
Ma, X. W., Li, C. D., Dong, X. Y., and Liao, H.:
Empirical analysis on the effectiveness of air quality control measures during mega events: Evidence from Beijing, China, J. Clean Prod., 271, 122536, https://doi.org/10.1016/j.jclepro.2020.122536, 2020.
Ma, X., Huang, J., Zhao, T., Liu, C., Zhao, K., Xing, J., and Xiao, W.:
Rapid increase in summer surface ozone over the North China Plain during 2013–2019: a side effect of particulate matter reduction control?, Atmos. Chem. Phys., 21, 1–16, https://doi.org/10.5194/acp-21-1-2021, 2021.
Masiol, M., Squizzato, S., Rich, D. Q., and Hopke, P. K.:
Long-term trends (2005–2016) of source apportioned PM2.5 across New York State, Atmos. Environ., 201, 110–120, https://doi.org/10.1016/j.atmosenv.2018.12.038, 2019.
Meng, Z. Y., Ding, G. A., Xu, X. B., Xu, X. D., Yu, H. Q., and Wang, S. F.:
Vertical distributions of SO2 and NO2 in the lower atmosphere in Beijing urban areas, China, Sci. Total Environ., 390, 456–465, https://doi.org/10.1016/j.scitotenv.2007.10.012, 2008.
Munir, S., Chen, H. B., and Ropkins, K.:
Quantifying temporal trends in ground level ozone concentration in the UK, Sci. Total Environ., 458–460, 217–227, https://doi.org/10.1016/j.scitotenv.2013.04.045, 2013.
Nøjgaard, J. K., Nguyen, Q. T., Glasius, M., and Sørensen, L. L.:
Nucleation and Aitken mode atmospheric particles in relation to O3 and NOx at semirural background in Denmark, Atmos. Environ., 49, 275–283, https://doi.org/10.1016/j.atmosenv.2011.11.040, 2012.
Nirel, R. and Dayan, U.:
On the Ratio of Sulfur Dioxide to Nitrogen Oxides as an Indicator of Air Pollution Sources, J. Appl. Meteorol., 40, 1209–1222, https://doi.org/10.1175/1520-0450(2001)040<1209:OTROSD>2.0.CO;2, 2001.
Paatero, P. and Tapper, U.:
Positive matrix factorization: A non-negative factor model with optimal utilization of error estimates of data values, Environmetrics, 5, 111–126, https://doi.org/10.1002/env.3170050203, 1994.
Police, S., Sahu, S. K., and Pandit, G. G.:
Chemical characterization of atmospheric particulate matter and their source apportionment at an emerging industrial coastal city, Visakhapatnam, India, Atmos. Pollut. Res., 7, 725–733, https://doi.org/10.1016/j.apr.2016.03.007, 2016.
Pugliese, S. C., Murphy, J. G., Geddes, J. A., and Wang, J. M.:
The impacts of precursor reduction and meteorology on ground-level ozone in the Greater Toronto Area, Atmos. Chem. Phys., 14, 8197–8207, https://doi.org/10.5194/acp-14-8197-2014, 2014.
Qi, L., Zhang, Y. F., Ma, Y. H., Chen, M. D., Ge, X. L., Ma, Y., Zheng, J., Wang, Z., and Li, S. Z.:
Source identification of trace elements in the atmosphere during the second Asian Youth Games in Nanjing, China: Influence of control measures on air quality, Atmos. Pollut. Res., 7, 547–556, https://doi.org/10.1016/j.apr.2016.01.003, 2016.
Querol, X., Viana, M., Alastuey, A., Amato, F., Moreno, T., Castillo, S., Pey, J., de la Rosa, J., Sánchez de la Campa, A., Artíñano, B., Salvador, P., García Dos Santos, S., Fernández-Patier, R., Moreno-Grau, S., Negral, L., Minguillón, M. C., Monfort, E., Gil, J. I., Inza, A., Ortega, L. A., Santamaría, J. M., and Zabalza, J.:
Source origin of trace elements in PM from regional background, urban and industrial sites of Spain, Atmos. Environ., 41, 7219–7231, https://doi.org/10.1016/j.atmosenv.2007.05.022, 2007.
Ryou, H. G., Heo, J., and Kim, S. Y.:
Source apportionment of PM10 and PM2.5 air pollution, and possible impacts of study characteristics in South Korea, Environ. Pollut., 240, 963–972, https://doi.org/10.1016/j.envpol.2018.03.066, 2018.
Sen, P. K.:
Estimates of the Regression Coefficient Based on Kendall's Tau AU – Sen, Pranab Kumar, J. Am. Stat. Assoc., 63, 1379–1389, https://doi.org/10.1080/01621459.1968.10480934, 1968.
Schleicher, N., Norra, S., Chen, Y., Chai, F., and Wang, S.:
Efficiency of mitigation measures to reduce particulate air pollution—A case study during the Olympic Summer Games 2008 in Beijing, China, Sci. Total Environ., 427–428, 146–158, https://doi.org/10.1016/j.scitotenv.2012.04.004, 2012.
Shi, Z. B., Song, C. B., Liu, B. W., Lu, G. D., Xu, J. S., Vu, T. V., Elliott, R. J. R., Li, W. J., Bloss, W. J., and Harrison, R. M.:
Abrupt but smaller than expected changes in surface air quality attributable to COVID-19 lockdowns, Sci Adv., 7, eabd6696, https://doi.org/10.1126/sciadv.abd6696, 2021.
Song, L. L., Dai, Q. L., Feng, Y. C., and Hopke, P. K.:
Estimating uncertainties of source contributions to PM2.5 using moving window evolving dispersion normalized PMF, Environ. Pollut., 286, 117576, https://doi.org/10.1016/j.envpol.2021.117576, 2021.
Tian, Y. Z., Wang, J., Peng, X., Shi, G. L., and Feng, Y. C.:
Estimation of the direct and indirect impacts of fireworks on the physicochemical characteristics of atmospheric PM10 and PM2.5, Atmos. Chem. Phys., 14, 9469–9479, https://doi.org/10.5194/acp-14-9469-2014, 2014.
Tsai, D. H., Wang, J. L., Chuang, K. J., and Chan, C. C.:
Traffic-related air pollution and cardiovascular mortality in central Taiwan, Sci. Total Environ., 408, 1818–1823, https://doi.org/10.1016/j.scitotenv.2010.01.044, 2010.
Viana, M., Kuhlbusch, T. A. J., Querol, X., Alastuey, A., Harrison, R. M., Hopke, P. K., Winiwarter, W., Vallius, M., Szidat, S., Prévôt, A. S. H., Hueglin, C., Bloemen, H., Wåhlin, P., Vecchi, R., Miranda, A. I., Kasper-Giebl, A., Maenhaut, W., and Hitzenberger, R.:
Source apportionment of particulate matter in Europe: A review of methods and results, J. Aerosol Sci., 39, 827–849, https://doi.org/10.1016/j.jaerosci.2008.05.007, 2008.
Vodonos, A. and Schwartz, J.:
Estimation of excess mortality due to long-term exposure to PM2.5 in continental United States using a high-spatiotemporal resolution model, Environ. Res., 196, 110904, https://doi.org/10.1016/j.envres.2021.110904, 2021.
Vu, T. V., Shi, Z., Cheng, J., Zhang, Q., He, K., Wang, S., and Harrison, R. M.:
Assessing the impact of clean air action on air quality trends in Beijing using a machine learning technique, Atmos. Chem. Phys., 19, 11303–11314, https://doi.org/10.5194/acp-19-11303-2019, 2019.
Wang, H. L., Miao, Q., Shen, L. J., Yang, Q., Wu, Y. Z., and Wei, H.:
Air pollutant variations in Suzhou during the 2019 novel coronavirus (COVID-19) lockdown of 2020: High time-resolution measurements of aerosol chemical compositions and source apportionment, Environ. Pollut., 271, 116298, https://doi.org/10.1016/j.envpol.2020.116298, 2021.
Wang, S. X., Xing, J., Zhao, B., Jang, C., and Hao, J. M.:
Effectiveness of national air pollution control policies on the air quality in metropolitan areas of China, J. Environ. Sci., 26, 13–22, https://doi.org/10.1016/S1001-0742(13)60381-2, 2014.
Wang, Y., Xue, Y. F., Tian, H. Z., Gao, J., Chen, Y., Zhu, C. Y., Liu, H. J., Wang, K., Hua, S. B., Liu, S. H., and Shao, P. Y.:
Effectiveness of temporary control measures for lowering PM2.5 pollution in Beijing and the implications, Atmos. Environ., 157, 75–83, https://doi.org/10.1016/j.atmosenv.2017.03.017, 2017.
Wang, Y. Q., Zhang, X. Y., and Draxler, R.:
TrajStat: GIS-based software that uses various trajectory statistical analysis methods to identify potential sources from long-term air pollution measurement data, Environ. Model. Softw., 24, 938–939, https://doi.org/10.1016/j.envsoft.2009.01.004, 2009.
Wang, Y. Y., Liu, B. S., Zhang, Y. F., Dai, Q. L., Song, C. B., Duan, L. Q., Guo, L. L., Zhao, J., Xue, Z. G., Bi, X. H., and Feng, Y. C.:
Potential health risks of inhaled toxic elements and risk sources during different COVID-19 lockdown stages in Linfen, China, Environ. Pollut., 284, 117454, https://doi.org/10.1016/j.envpol.2021.117454, 2021.
Xu, H., Xiao, Z. M., Chen, K., Tang, M., Zheng, N. Y., Li, P., Yang, N., Yang, W., and Deng, X. W.:
Spatial and temporal distribution, chemical characteristics, and sources of ambient particulate matter in the Beijing–Tianjin–Hebei region, Sci. Total Environ., 658, 280–293, https://doi.org/10.1016/j.scitotenv.2018.12.164, 2019.
Xu, L. L., Jiao, L., Hong, Z. Y., Zhang, Y. R., Du, W. J., Wu, X., Chen, Y. T., Deng, J. J., Hong, Y. W., and Chen, J. S.:
Source identification of PM2.5 at a port and an adjacent urban site in a coastal city of China: Impact of ship emissions and port activities, Sci. Total Environ., 634, 1205–1213, https://doi.org/10.1016/j.scitotenv.2018.04.087, 2018.
Xu, M., Qin, Z. F., Zhang, S. H., and Xie, Y.:
Health and economic benefits of clean air policies in China: A case study for Beijing–Tianjin–Hebei region, Environ. Pollut., 285, 117525, https://doi.org/10.1016/j.envpol.2021.117525, 2021.
Xu, W., Liu, X. J., Liu, L., Dore, A. J., Tang, A., Lu, L., Wu, Q. H., Zhang, Y. Y., Hao, T. X., Pan, Y. P., Chen, J. M., and Zhang, F. S.:
Impact of emission controls on air quality in Beijing during APEC 2014: Implications from water-soluble ions and carbonaceous aerosol in PM2.5 and their precursors, Atmos. Environ., 210, 241–252, https://doi.org/10.1016/j.atmosenv.2019.04.050, 2019.
Yin, H., Liu, C., Hu, Q. H., Liu, T., Wang, S., Gao, M., Xu, S. Q., Zhang, C. X., and Su, W. J.:
Opposite impact of emission reduction during the COVID-19 lockdown period on the surface concentrations of PM2.5 and O3 in Wuhan, China, Environ. Pollut., 289, 117899, https://doi.org/10.1016/j.envpol.2021.117899, 2021.
Yang, S., Duan, F., Ma, Y., Li, H., Ma, T., Zhu, L., Huang, T., Kimoto, T., and He, K.:
Mixed and intensive haze pollution during the transition period between autumn and winter in Beijing, China, Sci. Total Environ., 711, 134745, https://doi.org/10.1016/j.scitotenv.2019.134745, 2020.
Yu, M. F., Zhu, Y., Lin, C. J., Wang, S. X., Xing, J., Jang, C., Huang, J. Z., Huang, J. Y., Jin, J. B., and Yu, L.:
Effects of air pollution control measures on air quality improvement in Guangzhou, China, J. Environ. Manage., 244, 127–137, https://doi.org/10.1016/j.jenvman.2019.05.046, 2019.
Zhai, S., Jacob, D. J., Wang, X., Shen, L., Li, K., Zhang, Y., Gui, K., Zhao, T., and Liao, H.:
Fine particulate matter (PM2.5) trends in China, 2013–2018: separating contributions from anthropogenic emissions and meteorology, Atmos. Chem. Phys., 19, 11031–11041, https://doi.org/10.5194/acp-19-11031-2019, 2019.
Zhang, D. Z., Shi, G. Y., Iwasaka, Y., Hu, M., and Zang, J. Y.:
Anthropogenic Calcium Particles Observed in Beijing and Qingdao, China, Water Air Soil Poll.:
Focus, 5, 261–276, https://doi.org/10.1007/s11267-005-0743-y, 2005.
Zhang, Q., He, K. B., and Huo, H.:
Cleaning China's air, Nature, 484, 161–162, https://doi.org/10.1038/484161a, 2012.
Zhang, Q., Zheng, Y. X., Tong, D., Shao, M., Wang, S. X., Zhang, Y. H., Xu, X. D., Wang, J. N., He, H., Liu, W. Q., Ding, Y. H., Lei, Y., Li, J. H., Wang, Z. F., Zhang, X. Y., Wang, Y. S., Cheng, J., Liu, Y., Shi, Q. R., Yan, L., Geng, G. N., Hong, C. P., Li, M., Liu, F., Zheng, B., Cao, J. J., Ding, A. J., Gao, J., Fu, Q. Y., Huo, J. T., Liu, B. X., Liu, Z. R., Yang, F. M., He, K. B., and Hao, J. M.:
Drivers of improved PM2.5 air quality in China from 2013 to 2017, P. Natl. Acad. Sci USA, 116, 24463–24469, https://doi.org/10.1073/pnas.1907956116, 2019.
Zhang, Y., Yang, L. X., Bie, S. J., Zhao, T., Huang, Q., Li, J. S., Wang, P. C., Wang, Y. M., and Wang, W. X.:
Chemical compositions and the impact of sea salt in atmospheric PM1 and PM2.5 in the coastal area, Atmos. Res., 250, 105323, https://doi.org/10.1016/j.atmosres.2020.105323, 2021.
Zhao, C. K., Sun, Y., Zhong, Y. P., Xu, S. H., Liang, Y., Liu, S., He, X. D., Zhu, J. H., Shibamoto, T., and He, M.:
Spatio-temporal analysis of urban air pollutants throughout China during 2014–2019, Air Qual. Atmos. Hlth., 14, 1619–1632, https://doi.org/10.1007/s11869-021-01043-5, 2021.
Zhao, S., Tian, H. Z., Luo, L. N., Liu, H. J., Wu, B. B., Liu, S. H., Bai, X. X., Liu, W., Liu, X. Y., Wu, Y. M., Lin, S. M., Guo, Z. H., Lv, Y. Q., and Xue, Y. F.:
Temporal variation characteristics and source apportionment of metal elements in PM2.5 in urban Beijing during 2018–2019, Environ. Pollut., 268, 115856, https://doi.org/10.1016/j.envpol.2020.115856, 2021.
Zong, Z., Wang, X. P., Tian, C. G., Chen, Y. J., Fu, S. F., Qu, L., Ji, L., Li, J., and Zhang, G.:
PMF and PSCF based source apportionment of PM2.5 at a regional background site in North China, Atmos. Res., 203, 207–215, https://doi.org/10.1016/j.atmosres.2017.12.013, 2018.
Short summary
Understanding effectiveness of air pollution regulatory measures is critical for control policy. Machine learning and dispersion-normalized approaches were applied to decouple meteorologically deduced variations in Qingdao, China. Most pollutant concentrations decreased substantially after the Clean Air Action Plan. The largest emission reduction was from coal combustion and steel-related smelting. Qingdao is at risk of increased emissions from increased vehicular population and ozone pollution.
Understanding effectiveness of air pollution regulatory measures is critical for control policy....
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