Articles | Volume 24, issue 15
https://doi.org/10.5194/acp-24-8737-2024
© Author(s) 2024. 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-24-8737-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Measurement report: Impact of emission control measures on environmental persistent free radicals and reactive oxygen species – a short-term case study in Beijing
Yuanyuan Qin
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
Xinghua Zhang
Sinopec (Dalian) Research Institute of Petroleum and Petrochemicals Co., Ltd, Dalian, 116045, China
Wei Huang
Institute of Environmental Reference Materials of Environmental Development Centre of Ministry of Ecology and Environment, Beijing, 100029, China
Juanjuan Qin
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
Xiaoyu Hu
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
Yuxuan Cao
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
Tianyi Zhao
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
Beijing Yanshan Earth Critical Zone National Research Station, Beijing, 101408, China
Jihua Tan
CORRESPONDING AUTHOR
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
Ziyin Zhang
Institute of Urban Meteorology, China Meteorological Administration, Beijing, 100089, China
Xinming Wang
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
Zhenzhen Wang
School of Environmental Engineering, Changsha Environmental Protection Vocational College, Changsha, 410004, China
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Huanhuan Zhang, Rui Li, Chengpeng Huang, Xiaofei Li, Shuwei Dong, Fu Wang, Tingting Li, Yizhu Chen, Guohua Zhang, Yan Ren, Qingcai Chen, Ru-jin Huang, Siyu Chen, Tao Xue, Xinming Wang, and Mingjin Tang
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Suxia Yang, Bin Yuan, Yuwen Peng, Shan Huang, Wei Chen, Weiwei Hu, Chenglei Pei, Jun Zhou, David D. Parrish, Wenjie Wang, Xianjun He, Chunlei Cheng, Xiao-Bing Li, Xiaoyun Yang, Yu Song, Haichao Wang, Jipeng Qi, Baolin Wang, Chen Wang, Chaomin Wang, Zelong Wang, Tiange Li, E Zheng, Sihang Wang, Caihong Wu, Mingfu Cai, Chenshuo Ye, Wei Song, Peng Cheng, Duohong Chen, Xinming Wang, Zhanyi Zhang, Xuemei Wang, Junyu Zheng, and Min Shao
Atmos. Chem. Phys., 22, 4539–4556, https://doi.org/10.5194/acp-22-4539-2022, https://doi.org/10.5194/acp-22-4539-2022, 2022
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We use a model constrained using observations to study the formation of nitrate aerosol in and downwind of a representative megacity. We found different contributions of various chemical reactions to ground-level nitrate concentrations between urban and suburban regions. We also show that controlling VOC emissions are effective for decreasing nitrate formation in both urban and regional environments, although VOCs are not direct precursors of nitrate aerosol.
Wenjie Wang, Bin Yuan, Yuwen Peng, Hang Su, Yafang Cheng, Suxia Yang, Caihong Wu, Jipeng Qi, Fengxia Bao, Yibo Huangfu, Chaomin Wang, Chenshuo Ye, Zelong Wang, Baolin Wang, Xinming Wang, Wei Song, Weiwei Hu, Peng Cheng, Manni Zhu, Junyu Zheng, and Min Shao
Atmos. Chem. Phys., 22, 4117–4128, https://doi.org/10.5194/acp-22-4117-2022, https://doi.org/10.5194/acp-22-4117-2022, 2022
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From thorough measurements of numerous oxygenated volatile organic compounds, we show that their photodissociation can be important for radical production and ozone formation in the atmosphere. This effect was underestimated in previous studies, as measurements of them were lacking.
Haichao Wang, Chao Peng, Xuan Wang, Shengrong Lou, Keding Lu, Guicheng Gan, Xiaohong Jia, Xiaorui Chen, Jun Chen, Hongli Wang, Shaojia Fan, Xinming Wang, and Mingjin Tang
Atmos. Chem. Phys., 22, 1845–1859, https://doi.org/10.5194/acp-22-1845-2022, https://doi.org/10.5194/acp-22-1845-2022, 2022
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Juanjuan Qin, Jihua Tan, Xueming Zhou, Yanrong Yang, Yuanyuan Qin, Xiaobo Wang, Shaoxuan Shi, Kang Xiao, and Xinming Wang
Atmos. Chem. Phys., 22, 465–479, https://doi.org/10.5194/acp-22-465-2022, https://doi.org/10.5194/acp-22-465-2022, 2022
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Jianqiang Zeng, Yanli Zhang, Huina Zhang, Wei Song, Zhenfeng Wu, and Xinming Wang
Atmos. Meas. Tech., 15, 79–93, https://doi.org/10.5194/amt-15-79-2022, https://doi.org/10.5194/amt-15-79-2022, 2022
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The emission of biogenic volatile organic compounds (BVOCs) from plant leaves is an essential part of biosphere–atmosphere interactions. Here we demonstrate how a dynamic chamber for measuring branch-scale BVOC emissions could be characterized both in the lab for adsorptive losses and in the field for ambient–enclosure environmental differences. The results also imply emission factors for terpenes might be underestimated if measured using dynamic chambers without certified transfer efficiencies.
Wei Sun, Yuzhen Fu, Guohua Zhang, Yuxiang Yang, Feng Jiang, Xiufeng Lian, Bin Jiang, Yuhong Liao, Xinhui Bi, Duohong Chen, Jianmin Chen, Xinming Wang, Jie Ou, Ping'an Peng, and Guoying Sheng
Atmos. Chem. Phys., 21, 16631–16644, https://doi.org/10.5194/acp-21-16631-2021, https://doi.org/10.5194/acp-21-16631-2021, 2021
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We sampled cloud water at a remote mountain site and investigated the molecular characteristics. CHON and CHO are dominant in cloud water. No statistical difference in the oxidation state is observed between cloud water and interstitial PM2.5. Most of the formulas are aliphatic and olefinic species. CHON, with aromatic structures and organosulfates, are abundant, especially in nighttime samples. The in-cloud and multi-phase dark reactions likely contribute significantly.
Peng Wang, Juanyong Shen, Men Xia, Shida Sun, Yanli Zhang, Hongliang Zhang, and Xinming Wang
Atmos. Chem. Phys., 21, 10347–10356, https://doi.org/10.5194/acp-21-10347-2021, https://doi.org/10.5194/acp-21-10347-2021, 2021
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Ozone (O3) pollution has received extensive attention due to worsening air quality and rising health risks. The Chinese National Day holiday (CNDH), which is associated with intensive commercial and tourist activities, serves as a valuable experiment to evaluate the O3 response during the holiday. We find sharply increasing trends of observed O3 concentrations throughout China during the CNDH, leading to 33 % additional total daily deaths.
Hua Fang, Xiaoqing Huang, Yanli Zhang, Chenglei Pei, Zuzhao Huang, Yujun Wang, Yanning Chen, Jianhong Yan, Jianqiang Zeng, Shaoxuan Xiao, Shilu Luo, Sheng Li, Jun Wang, Ming Zhu, Xuewei Fu, Zhenfeng Wu, Runqi Zhang, Wei Song, Guohua Zhang, Weiwei Hu, Mingjin Tang, Xiang Ding, Xinhui Bi, and Xinming Wang
Atmos. Chem. Phys., 21, 10005–10013, https://doi.org/10.5194/acp-21-10005-2021, https://doi.org/10.5194/acp-21-10005-2021, 2021
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A tunnel test was initiated to measure the vehicular IVOC emissions under real-world driving conditions. Higher SOA formation estimated from vehicular IVOCs compared to those from traditional VOCs emphasized the greater importance of IVOCs in modulating urban SOA. The results also revealed that non-road diesel-fueled engines greatly contributed to IVOCs in China.
Anke Mutzel, Yanli Zhang, Olaf Böge, Maria Rodigast, Agata Kolodziejczyk, Xinming Wang, and Hartmut Herrmann
Atmos. Chem. Phys., 21, 8479–8498, https://doi.org/10.5194/acp-21-8479-2021, https://doi.org/10.5194/acp-21-8479-2021, 2021
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This study investigates secondary organic aerosol (SOA) formation and particle growth from α-pinene, limonene, and m-cresol oxidation through NO3 and OH radicals and the effect of relative humidity. The formed SOA is comprehensively characterized with respect to the content of OC / EC, WSOC, SOA-bound peroxides, and SOA marker compounds. The findings present new insights and implications of nighttime chemistry, which can form SOA more efficiently than OH radical reaction during daytime.
Chenshuo Ye, Bin Yuan, Yi Lin, Zelong Wang, Weiwei Hu, Tiange Li, Wei Chen, Caihong Wu, Chaomin Wang, Shan Huang, Jipeng Qi, Baolin Wang, Chen Wang, Wei Song, Xinming Wang, E Zheng, Jordan E. Krechmer, Penglin Ye, Zhanyi Zhang, Xuemei Wang, Douglas R. Worsnop, and Min Shao
Atmos. Chem. Phys., 21, 8455–8478, https://doi.org/10.5194/acp-21-8455-2021, https://doi.org/10.5194/acp-21-8455-2021, 2021
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We performed measurements of gaseous and particulate organic compounds using a state-of-the-art online mass spectrometer in urban air. Using the dataset, we provide a holistic chemical characterization of oxygenated organic compounds in the polluted urban atmosphere, which can serve as a reference for the future field measurements of organic compounds in cities.
Chao Peng, Patricia N. Razafindrambinina, Kotiba A. Malek, Lanxiadi Chen, Weigang Wang, Ru-Jin Huang, Yuqing Zhang, Xiang Ding, Maofa Ge, Xinming Wang, Akua A. Asa-Awuku, and Mingjin Tang
Atmos. Chem. Phys., 21, 7135–7148, https://doi.org/10.5194/acp-21-7135-2021, https://doi.org/10.5194/acp-21-7135-2021, 2021
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Organosulfates are important constituents in tropospheric aerosol particles, but their hygroscopic properties and cloud condensation nuclei activities are not well understood. In our work, three complementary techniques were employed to investigate the interactions of 11 organosulfates with water vapor under sub- and supersaturated conditions.
Claire E. Reeves, Graham P. Mills, Lisa K. Whalley, W. Joe F. Acton, William J. Bloss, Leigh R. Crilley, Sue Grimmond, Dwayne E. Heard, C. Nicholas Hewitt, James R. Hopkins, Simone Kotthaus, Louisa J. Kramer, Roderic L. Jones, James D. Lee, Yanhui Liu, Bin Ouyang, Eloise Slater, Freya Squires, Xinming Wang, Robert Woodward-Massey, and Chunxiang Ye
Atmos. Chem. Phys., 21, 6315–6330, https://doi.org/10.5194/acp-21-6315-2021, https://doi.org/10.5194/acp-21-6315-2021, 2021
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The impact of isoprene on atmospheric chemistry is dependent on how its oxidation products interact with other pollutants, specifically nitrogen oxides. Such interactions can lead to isoprene nitrates. We made measurements of the concentrations of individual isoprene nitrate isomers in Beijing and used a model to test current understanding of their chemistry. We highlight areas of uncertainty in understanding, in particular the chemistry following oxidation of isoprene by the nitrate radical.
Long Peng, Lei Li, Guohua Zhang, Xubing Du, Xinming Wang, Ping'an Peng, Guoying Sheng, and Xinhui Bi
Atmos. Chem. Phys., 21, 5605–5613, https://doi.org/10.5194/acp-21-5605-2021, https://doi.org/10.5194/acp-21-5605-2021, 2021
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We build a novel system that utilizes an aerodynamic aerosol classifier (AAC) combined with a single-particle aerosol mass spectrometry (SPAMS) to simultaneously characterize the volume equivalent diameter (Dve), chemical compositions, and effective density (ρe) of individual particles in real time. A test of the AAC-SPAMS with both spherical and aspherical particles shows that the deviations between the measured and theoretical values are less than 6 %.
Lisa K. Whalley, Eloise J. Slater, Robert Woodward-Massey, Chunxiang Ye, James D. Lee, Freya Squires, James R. Hopkins, Rachel E. Dunmore, Marvin Shaw, Jacqueline F. Hamilton, Alastair C. Lewis, Archit Mehra, Stephen D. Worrall, Asan Bacak, Thomas J. Bannan, Hugh Coe, Carl J. Percival, Bin Ouyang, Roderic L. Jones, Leigh R. Crilley, Louisa J. Kramer, William J. Bloss, Tuan Vu, Simone Kotthaus, Sue Grimmond, Yele Sun, Weiqi Xu, Siyao Yue, Lujie Ren, W. Joe F. Acton, C. Nicholas Hewitt, Xinming Wang, Pingqing Fu, and Dwayne E. Heard
Atmos. Chem. Phys., 21, 2125–2147, https://doi.org/10.5194/acp-21-2125-2021, https://doi.org/10.5194/acp-21-2125-2021, 2021
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To understand how emission controls will impact ozone, an understanding of the sources and sinks of OH and the chemical cycling between peroxy radicals is needed. This paper presents measurements of OH, HO2 and total RO2 taken in central Beijing. The radical observations are compared to a detailed chemistry model, which shows that under low NO conditions, there is a missing OH source. Under high NOx conditions, the model under-predicts RO2 and impacts our ability to model ozone.
Mike J. Newland, Daniel J. Bryant, Rachel E. Dunmore, Thomas J. Bannan, W. Joe F. Acton, Ben Langford, James R. Hopkins, Freya A. Squires, William Dixon, William S. Drysdale, Peter D. Ivatt, Mathew J. Evans, Peter M. Edwards, Lisa K. Whalley, Dwayne E. Heard, Eloise J. Slater, Robert Woodward-Massey, Chunxiang Ye, Archit Mehra, Stephen D. Worrall, Asan Bacak, Hugh Coe, Carl J. Percival, C. Nicholas Hewitt, James D. Lee, Tianqu Cui, Jason D. Surratt, Xinming Wang, Alastair C. Lewis, Andrew R. Rickard, and Jacqueline F. Hamilton
Atmos. Chem. Phys., 21, 1613–1625, https://doi.org/10.5194/acp-21-1613-2021, https://doi.org/10.5194/acp-21-1613-2021, 2021
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We report the formation of secondary pollutants in the urban megacity of Beijing that are typically associated with remote regions such as rainforests. This is caused by extremely low levels of nitric oxide (NO), typically expected to be high in urban areas, observed in the afternoon. This work has significant implications for how we understand atmospheric chemistry in the urban environment and thus for how to implement effective policies to improve urban air quality.
W. Joe F. Acton, Zhonghui Huang, Brian Davison, Will S. Drysdale, Pingqing Fu, Michael Hollaway, Ben Langford, James Lee, Yanhui Liu, Stefan Metzger, Neil Mullinger, Eiko Nemitz, Claire E. Reeves, Freya A. Squires, Adam R. Vaughan, Xinming Wang, Zhaoyi Wang, Oliver Wild, Qiang Zhang, Yanli Zhang, and C. Nicholas Hewitt
Atmos. Chem. Phys., 20, 15101–15125, https://doi.org/10.5194/acp-20-15101-2020, https://doi.org/10.5194/acp-20-15101-2020, 2020
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Air quality in Beijing is of concern to both policy makers and the general public. In order to address concerns about air quality it is vital that the sources of atmospheric pollutants are understood. This work presents the first top-down measurement of volatile organic compound (VOC) emissions in Beijing. These measurements are used to evaluate the emissions inventory and assess the impact of VOC emission from the city centre on atmospheric chemistry.
Caihong Wu, Chaomin Wang, Sihang Wang, Wenjie Wang, Bin Yuan, Jipeng Qi, Baolin Wang, Hongli Wang, Chen Wang, Wei Song, Xinming Wang, Weiwei Hu, Shengrong Lou, Chenshuo Ye, Yuwen Peng, Zelong Wang, Yibo Huangfu, Yan Xie, Manni Zhu, Junyu Zheng, Xuemei Wang, Bin Jiang, Zhanyi Zhang, and Min Shao
Atmos. Chem. Phys., 20, 14769–14785, https://doi.org/10.5194/acp-20-14769-2020, https://doi.org/10.5194/acp-20-14769-2020, 2020
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Based on measurements from an online mass spectrometer, we quantify volatile organic compound (VOC) concentrations from numerous ions of the mass spectrometer, using information from laboratory-obtained calibration results. We find that most VOC concentrations are from oxygenated VOCs (OVOCs). We further show that these OVOCs also contribute significantly to OH reactivity. Our results suggest the important role of OVOCs in VOC emissions and chemistry in urban air.
Eloise J. Slater, Lisa K. Whalley, Robert Woodward-Massey, Chunxiang Ye, James D. Lee, Freya Squires, James R. Hopkins, Rachel E. Dunmore, Marvin Shaw, Jacqueline F. Hamilton, Alastair C. Lewis, Leigh R. Crilley, Louisa Kramer, William Bloss, Tuan Vu, Yele Sun, Weiqi Xu, Siyao Yue, Lujie Ren, W. Joe F. Acton, C. Nicholas Hewitt, Xinming Wang, Pingqing Fu, and Dwayne E. Heard
Atmos. Chem. Phys., 20, 14847–14871, https://doi.org/10.5194/acp-20-14847-2020, https://doi.org/10.5194/acp-20-14847-2020, 2020
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The paper details atmospheric chemistry in a megacity (Beijing), focussing on radicals which mediate the formation of secondary pollutants such as ozone and particles. Highly polluted conditions were experienced, including the highest ever levels of nitric oxide (NO), with simultaneous radical measurements. Radical concentrations were large during "haze" events, demonstrating active photochemistry. Modelling showed that our understanding of the chemistry at high NOx levels is incomplete.
Qingqing Yu, Xiang Ding, Quanfu He, Weiqiang Yang, Ming Zhu, Sheng Li, Runqi Zhang, Ruqin Shen, Yanli Zhang, Xinhui Bi, Yuesi Wang, Ping'an Peng, and Xinming Wang
Atmos. Chem. Phys., 20, 14581–14595, https://doi.org/10.5194/acp-20-14581-2020, https://doi.org/10.5194/acp-20-14581-2020, 2020
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We carried out a 1-year PM concurrent observation at 12 sites across six regions of China, and size-segregated PAHs were measured. We found both PAHs and BaPeq were concentrated in PM1.1, and northern China had higher PAHs' pollution and inhalation cancer risk than southern China. Nationwide increases in both PAH levels and inhalation cancer risk occurred in winter. We suggest reducing coal and biofuel consumption in the residential sector is an important option to mitigate PAHs' health risks.
Chaomin Wang, Bin Yuan, Caihong Wu, Sihang Wang, Jipeng Qi, Baolin Wang, Zelong Wang, Weiwei Hu, Wei Chen, Chenshuo Ye, Wenjie Wang, Yele Sun, Chen Wang, Shan Huang, Wei Song, Xinming Wang, Suxia Yang, Shenyang Zhang, Wanyun Xu, Nan Ma, Zhanyi Zhang, Bin Jiang, Hang Su, Yafang Cheng, Xuemei Wang, and Min Shao
Atmos. Chem. Phys., 20, 14123–14138, https://doi.org/10.5194/acp-20-14123-2020, https://doi.org/10.5194/acp-20-14123-2020, 2020
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We utilized a novel online mass spectrometry method to measure the total concentration of higher alkanes at each carbon number at two different sites in China, allowing us to take into account SOA contributions from all isomers for higher alkanes. We found that higher alkanes account for significant fractions of SOA formation at the two sites. The contributions are comparable to or even higher than single-ring aromatics, the most-recognized SOA precursors in urban air.
Yuzhen Fu, Qinhao Lin, Guohua Zhang, Yuxiang Yang, Yiping Yang, Xiufeng Lian, Long Peng, Feng Jiang, Xinhui Bi, Lei Li, Yuanyuan Wang, Duohong Chen, Jie Ou, Xinming Wang, Ping'an Peng, Jianxi Zhu, and Guoying Sheng
Atmos. Chem. Phys., 20, 14063–14075, https://doi.org/10.5194/acp-20-14063-2020, https://doi.org/10.5194/acp-20-14063-2020, 2020
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Based on the analysis of the morphology and mixing structure of the activated and unactivated particles, our results emphasize the role of in-cloud processes in the chemistry and microphysical properties of individual activated particles. Given that organic coatings may determine the particle hygroscopicity and heterogeneous chemical reactivity, the increase of OM-shelled particles upon in-cloud processes should have considerable implications for their evolution and climate impact.
Chao Peng, Yu Wang, Zhijun Wu, Lanxiadi Chen, Ru-Jin Huang, Weigang Wang, Zhe Wang, Weiwei Hu, Guohua Zhang, Maofa Ge, Min Hu, Xinming Wang, and Mingjin Tang
Atmos. Chem. Phys., 20, 13877–13903, https://doi.org/10.5194/acp-20-13877-2020, https://doi.org/10.5194/acp-20-13877-2020, 2020
Lanxiadi Chen, Chao Peng, Wenjun Gu, Hanjing Fu, Xing Jian, Huanhuan Zhang, Guohua Zhang, Jianxi Zhu, Xinming Wang, and Mingjin Tang
Atmos. Chem. Phys., 20, 13611–13626, https://doi.org/10.5194/acp-20-13611-2020, https://doi.org/10.5194/acp-20-13611-2020, 2020
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We investigated hygroscopic properties of a number of mineral dust particles in a quantitative manner, via measuring the sample mass at different relative humidities. The robust and comprehensive data obtained would significantly improve our knowledge of hygroscopicity of mineral dust and its impacts on atmospheric chemistry and climate.
Cited articles
Ainur, D., Chen, Q., Sha, T., Zarak, M., Dong, Z., Guo, W., Zhang, Z., Dina, K., and An, T.: Outdoor health risk of atmospheric particulate matter at night in Xi'an, northwestern China, Environ. Sci. Technol., 57, 9252–9265, https://doi.org/10.1021/acs.est.3c02670, 2023.
Arangio, A. M., Tong, H., Socorro, J., Pöschl, U., and Shiraiwa, M.: Quantification of environmentally persistent free radicals and reactive oxygen species in atmospheric aerosol particles, Atmos. Chem. Phys., 16, 13105–13119, https://doi.org/10.5194/acp-16-13105-2016, 2016.
Bates, J. T., Fang, T., Verma, V., Zeng, L., Weber, R. J., Tolbert, P. E., Abrams, J. Y., Sarnat, S. E., Klein, M., and Mulholland, J. A.: Review of acellular assays of ambient particulate matter oxidative potential: methods and relationships with composition, sources, and health effects, Environ. Sci. Technol., 53, 4003–4019, https://doi.org/10.1021/acs.est.8b03430, 2019.
Borrowman, C. K., Zhou, S., Burrow, T. E., and Abbatt, J. P.: Formation of environmentally persistent free radicals from the heterogeneous reaction of ozone and polycyclic aromatic compounds, Phys. Chem. Chem. Phys., 18, 205–212, https://doi.org/10.1039/C5CP05606C, 2016.
Brehmer, C., Lai, A., Clark, S., Shan, M., Ni, K., Ezzati, M., Yang, X., Baumgartner, J., Schauer, J. J., and Carter, E.: The oxidative potential of personal and household PM2.5 in a rural setting in southwestern China, Environ. Sci. Technol., 53, 2788–2798, https://doi.org/10.1021/acs.est.8b05120, 2019.
Cai, H. and Xie, S. D.: A modelling study of air quality impact of odd-even day traffic restriction scheme before, during and after the 2008 Beijing Olympic Games, Atmos. Chem. Phys. Discuss., 10, 5135–5184, https://doi.org/10.5194/acpd-10-5135-2010, 2010.
Cai, J., Chu, B., Yao, L., Yan, C., Heikkinen, L. M., Zheng, F., Li, C., Fan, X., Zhang, S., Yang, D., Wang, Y., Kokkonen, T. V., Chan, T., Zhou, Y., Dada, L., Liu, Y., He, H., Paasonen, P., Kujansuu, J. T., Petäjä, T., Mohr, C., Kangasluoma, J., Bianchi, F., Sun, Y., Croteau, P. L., Worsnop, D. R., Kerminen, V.-M., Du, W., Kulmala, M., and Daellenbach, K. R.: Size-segregated particle number and mass concentrations from different emission sources in urban Beijing, Atmos. Chem. Phys., 20, 12721–12740, https://doi.org/10.5194/acp-20-12721-2020, 2020.
Chen, Q., Wang, M., Sun, H., Wang, X., Wang, Y., Li, Y., Zhang, L., and Mu, Z.: Enhanced health risks from exposure to environmentally persistent free radicals and the oxidative stress of PM2.5 from Asian dust storms in Erenhot, Zhangbei and Jinan, China, Environ. Int., 121, 260–268, https://doi.org/10.1016/j.envint.2018.09.012, 2018a.
Chen, Q., Sun, H., Wang, M., Mu, Z., Wang, Y., Li, Y., Wang, Y., Zhang, L., and Zhang, Z.: Dominant fraction of EPFRs from nonsolvent-extractable organic matter in fine particulates over Xi'an, China, Environ. Sci. Technol., 52, 9646–9655, https://doi.org/10.1021/acs.est.8b01980, 2018b.
Chen, Q., Sun, H., Wang, M., Wang, Y., Zhang, L., and Han, Y.: Environmentally persistent free radical (EPFR) formation by visible-light illumination of the organic matter in atmospheric particles, Environ. Sci. Technol., 53, 10053–10061, https://doi.org/10.1021/acs.est.9b02327, 2019a.
Chen, Q., Sun, H., Mu, Z., Wang, Y., Li, Y., Zhang, L., Wang, M., and Zhang, Z.: Characteristics of environmentally persistent free radicals in PM2.5: Concentrations, species and sources in Xi'an, Northwestern China, Environ. Pollut., 247, 18–26, https://doi.org/10.1016/j.envpol.2019.01.015, 2019b.
Chen, Q., Sun, H., Wang, J., Shan, M., Yang, X., Deng, M., Wang, Y., and Zhang, L.: Long-life type – The dominant fraction of EPFRs in combustion sources and ambient fine particles in Xi'an, Atmos. Environ., 219, 117059, https://doi.org/10.1016/j.atmosenv.2019.117059, 2019c.
Chen, Q., Sun, H., Song, W., Cao, F., Tian, C., and Zhang, Y.-L.: Size-resolved exposure risk of persistent free radicals (PFRs) in atmospheric aerosols and their potential sources, Atmos. Chem. Phys., 20, 14407–14417, https://doi.org/10.5194/acp-20-14407-2020, 2020.
Dellinger, B., Pryor, W. A., Cueto, R., Squadrito, G. L., Hegde, V., and Deutsch, W. A.: Role of free radicals in the toxicity of airborne fine particulate matter, Chem. Res. Toxicol., 14, 1371–1377, https://doi.org/10.1021/tx010050x, 2001.
Dugas, T. R., Lomnicki, S., Cormier, S. A., Dellinger, B., and Reams, M.: Addressing emerging risks: Scientific and regulatory challenges associated with environmentally persistent free radicals, Int. J. Env. Res. Pub. He., 13, 573, https://doi.org/10.3390/ijerph13060573, 2016.
Fang, T., Guo, H., Zeng, L., Verma, V., Nenes, A., and Weber, R. J.: Highly acidic ambient particles, soluble metals, and oxidative potential: A link between sulfate and aerosol toxicity, Environ. Sci. Technol., 51, 2611–2620, https://doi.org/10.1021/acs.est.6b06151, 2017.
Fang, T., Hwang, B. C., Kapur, S., Hopstock, K. S., Wei, J., Nguyen, V., Nizkorodov, S. A., and Shiraiwa, M.: Wildfire particulate matter as a source of environmentally persistent free radicals and reactive oxygen species, Environmental Science: Atmospheres, 3, 581–594, https://doi.org/10.1039/D2EA00170E, 2023.
Gehling, W., Khachatryan, L., and Dellinger, B.: Hydroxyl radical generation from environmentally persistent free radicals (EPFRs) in PM2.5, Environ. Sci. Technol., 48, 4266–4272, https://doi.org/10.1021/es401770y, 2014.
Guo, J., He, J., Liu, H., Miao, Y., Liu, H., and Zhai, P.: Impact of various emission control schemes on air quality using WRF-Chem during APEC China 2014, Atmos. Environ., 140, 311–319, https://doi.org/10.1016/j.atmosenv.2016.05.046, 2016.
Guo, X., Zhang, N., Hu, X., Huang, Y., Ding, Z., Chen, Y., and Lian, H.: Characteristics and potential inhalation exposure risks of PM2.5–bound environmental persistent free radicals in Nanjing, a mega–city in China, Atmos. Environ., 224, 117355, https://doi.org/10.1016/j.atmosenv.2020.117355, 2020.
He, Z., Shi, X., Wang, X., and Xu, Y.: Urbanisation and the geographic concentration of industrial SO2 emissions in China, Urban. Stud., 54, 3579–3596, https://doi.org/10.1177/0042098016669915, 2017.
Hien, P., Hangartner, M., Fabian, S., and Tan, P.: Concentrations of NO2, SO2, and benzene across Hanoi measured by passive diffusion samplers, Atmos. Environ., 88, 66–73, https://doi.org/10.1016/j.atmosenv.2014.01.036, 2014.
Hu, Y., Zhang, B., Guo, Q., Wang, S., and Lu, S.: Characterization into environmentally persistent free radicals formed in incineration fly ash and pyrolysis biochar of sewage sludge and biomass, J. Clean. Prod., 373, 133666, https://doi.org/10.1016/j.jclepro.2022.133666, 2022.
Huang, J., Pan, X., Guo, X., and Li, G.: Health impact of China's air pollution prevention and control action plan: An analysis of national air quality monitoring and mortality data, Lancet Planet. Health., 2, e313–e323, https://doi.org/10.1016/S2542-5196(18)30141-4, 2018.
Huang, W., Zhang, Y., Zhang, Y., Zeng, L., Dong, H., Huo, P., Fang, D., and Schauer, J. J.: Development of an automated sampling-analysis system for simultaneous measurement of reactive oxygen species (ROS) in gas and particle phases: GAC-ROS, Atmos. Environ., 134, 18–26, https://doi.org/10.1016/j.atmosenv.2016.03.038, 2016.
Huang, W., Fang, D., Shang, J., Li, Z., Zhang, Y., Huo, P., Liu, Z., Schauer, J. J., and Zhang, Y.: Relative impact of short-term emissions controls on gas and particle-phase oxidative potential during the 2015 China Victory Day Parade in Beijing, China, Atmos. Environ., 183, 49–56, https://doi.org/10.1016/j.atmosenv.2018.03.046, 2018.
Hwang, B., Fang, T., Pham, R., Wei, J., Gronstal, S., Lopez, B., Frederickson, C., Galeazzo, T., Wang, X., and Jung, H.: Environmentally persistent free radicals, reactive oxygen species generation, and oxidative potential of highway PM2.5, ACS Earth Space. Chem., 5, 1865–1875, https://doi.org/10.1021/acsearthspacechem.1c00135, 2021.
Jia, H., Zhao, S., Shi, Y., Zhu, K., Gao, P., and Zhu, L.: Mechanisms for light-driven evolution of environmentally persistent free radicals and photolytic degradation of PAHs on Fe(III)-montmorillonite surface, J. Hazard. Mater., 362, 92–98, https://doi.org/10.1016/j.jhazmat.2018.09.019, 2019.
Ke, W., Zhang, S., Wu, Y., Zhao, B., Wang, S., and Hao, J.: Assessing the future vehicle fleet electrification: The impacts on regional and urban air quality, Environ. Sci. Technol., 51, 1007–1016, https://doi.org/10.1021/acs.est.6b04253, 2017.
Khan, F., Garg, V. K., Singh, A. K., and Kumar, T.: Role of free radicals and certain antioxidants in the management of huntington's disease: A review, J. Anal. Pharm. Res, 7, 386–392, https://doi.org/10.15406/japlr.2018.07.00256, 2018.
Lang, D., Jiang, F., Gao, X., Yi, P., Liu, Y., Li, H., Chen, Q., Pan, B., and Xing, B.: Generation of environmentally persistent free radicals on faceted TiO2 in an ambient environment: roles of crystalline surface structures, Environ. Sci. Nano., 9, 2521–2533, https://doi.org/10.1039/D2EN00240J, 2022.
Li, H., Pan, B., Liao, S., Zhang, D., and Xing, B.: Formation of environmentally persistent free radicals as the mechanism for reduced catechol degradation on hematite-silica surface under UV irradiation, Environ. Pollut., 188, 153–158, https://doi.org/10.1016/j.envpol.2014.02.012, 2014.
Li, H., Chen, Q., Wang, C., Wang, R., Sha, T., Yang, X., and Ainur, D.: Pollution characteristics of environmental persistent free radicals (EPFRs) and their contribution to oxidation potential in road dust in a large city in northwest China, J. Hazard. Mater., 442, 130087, https://doi.org/10.1016/j.jhazmat.2022.130087, 2023.
Li, Z., Zhao, H., Li, X., and Bekele, T. G.: Characteristics and sources of environmentally persistent free radicals in PM2.5 in Dalian, Northeast China: correlation with polycyclic aromatic hydrocarbons, Environ. Sci. Pollut. Res., 29, 24612–24622, https://doi.org/10.1007/s11356-021-17688-9, 2022.
Lin, M. and Yu, J. Z.: Assessment of interactions between transition metals and atmospheric organics: Ascorbic acid depletion and hydroxyl radical formation in organic-metal mixtures, Environ. Sci. Technol., 54, 1431–1442, https://doi.org/10.1021/acs.est.9b07478, 2020.
Lin, P., Hu, M., Deng, Z., Slanina, J., Han, S., Kondo, Y., Takegawa, N., Miyazaki, Y., Zhao, Y., and Sugimoto, N.: Seasonal and diurnal variations of organic carbon in PM2.5 in Beijing and the estimation of secondary organic carbon, J. Geophys. Res., 114, D00G11, https://doi.org/10.1029/2008JD010902, 2009.
Ma, X., Li, C., Dong, X., 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.
Niu, Y., Li, X., Qi, B., and Du, R.: Variation in the concentrations of atmospheric PM2.5 and its main chemical components in an eastern China city (Hangzhou) since the release of the Air Pollution Prevention and Control Action Plan in 2013, Air Qual. Atmos. Health., 15, 321–337, https://doi.org/10.1007/s11869-021-01107-6, 2022.
Odinga, E. S., Waigi, M. G., Gudda, F. O., Wang, J., Yang, B., Hu, X., Li, S., and Gao, Y.: Occurrence, formation, environmental fate and risks of environmentally persistent free radicals in biochars, Environ. Int., 134, 105172, https://doi.org/10.1016/j.envint.2019.105172, 2020.
Okuda, T., Matsuura, S., Yamaguchi, D., Umemura, T., Hanada, E., Orihara, H., Tanaka, S., He, K., Ma, Y., Cheng, Y., and Liang, L.: The impact of the pollution control measures for the 2008 Beijing Olympic Games on the chemical composition of aerosols, Atmos. Environ., 45, 2789–2794, https://doi.org/10.1016/j.atmosenv.2011.01.053, 2011.
Pan, B., Li, H., Lang, D., and Xing, B.: Environmentally persistent free radicals: Occurrence, formation mechanisms and implications, Environ. Pollut., 248, 320–331, https://doi.org/10.1016/j.envpol.2019.02.032, 2019.
Perrone, M. G., Carbone, C., Faedo, D., Ferrero, L., Maggioni, A., Sangiorgi, G., and Bolzacchini, E.: Exhaust emissions of polycyclic aromatic hydrocarbons, n-alkanes and phenols from vehicles coming within different European classes, Atmos. Environ., 82, 391–400, https://doi.org/10.1016/j.atmosenv.2013.10.040, 2014.
Pipal, A. S., Jan, R., Bisht, D. S., Srivastava, A. K., Tiwari, S., and Taneja, A.: Day and night variability of atmospheric organic and elemental carbon during winter of 2011–12 in Agra, India, Sustain. Environ. Res., 24, 107–116, 2014.
Qian, R., Zhang, S., Peng, C., Zhang, L., Yang, F., Tian, M., Huang, R., Wang, Q., Chen, Q., Yao, X., and Chen, Y.: Characteristics and potential exposure risks of environmentally persistent free radicals in PM2.5 in the three gorges reservoir area, Southwestern China, Chemosphere, 252, 126425, https://doi.org/10.1016/j.chemosphere.2020.126425, 2020.
Qin, Y., Zhang, X., Huang, W., Qin, J., Hu, X., Cao, Y., Zhao, T., Zhang, Y., Tan, J., Zhang, Z., Wang, X., and Wang, Z.: Measurement report: Impact of emission control measures on environmental persistent free radicals and reactive oxygen species – A short-term case study in Beijing, Zenodo [data set], https://doi.org/10.5281/zenodo.10136894, 2023.
Saravia, J., Lee, G. I., Lomnicki, S., Dellinger, B., and Cormier, S. A.: Particulate matter containing environmentally persistent free radicals and adverse infant respiratory health effects: a review, J. Biochem. Mol. Toxicol., 27, 56–68, https://doi.org/10.1002/jbt.21465, 2013.
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, 146–158, https://doi.org/10.1016/j.scitotenv.2012.04.004, 2012.
Sharma, S., Mandal, T., Jain, S., Saraswati, Sharma, A., and Saxena, M.: Source apportionment of PM2.5 in Delhi, India using PMF model, Bull. Environ. Contam. Toxicol., 97, 286–293, https://doi.org/10.1007/s00128-016-1836-1, 2016.
Stevanovic, S., Gali, N. K., Salimi, F., Brown, R. A., Ning, Z., Cravigan, L., Brimblecombe, P., Bottle, S., and Ristovski, Z. D.: Diurnal profiles of particle-bound ROS of PM2.5 in urban environment of Hong Kong and their association with PM2.5, black carbon, ozone and PAHs, Atmos. Environ., 219, 117023, https://doi.org/10.1016/j.atmosenv.2019.117023, 2019.
Sun, Y., Wang, Z., Wild, O., Xu, W., Chen, C., Fu, P., Du, W., Zhou, L., Zhang, Q., Han, T., Wang, Q., Pan, X., Zheng, H., Li, J., Guo, X., Liu, J., and Worsnop, D. R.: “APEC Blue”: Secondary aerosol reductions from emission controls in Beijing, Sci. Rep., 6, 20668, https://doi.org/10.1038/srep20668, 2016.
Thevenot, P. T., Saravia, J., Jin, N., Giaimo, J. D., Chustz, R. E., Mahne, S., Kelley, M. A., Hebert, V. Y., Dellinger, B., and Dugas, T. R.: Radical-containing ultrafine particulate matter initiates epithelial-to-mesenchymal transitions in airway epithelial cells, Am. J. Respir. Cell Mol. Biol., 48, 188–197, https://doi.org/10.1165/rcmb.2012-0052OC, 2013.
Tong, H., Lakey, P. S. J., Arangio, A. M., Socorro, J., Shen, F., Lucas, K., Brune, W. H., Pöschl, U., and Shiraiwa, M.: Reactive oxygen species formed by secondary organic aerosols in water and surrogate lung fluid, Environ. Sci. Technol., 52, 11642–11651, https://doi.org/10.1021/acs.est.8b03695, 2018.
Vejerano, E. P., Rao, G., Khachatryan, L., Cormier, S. A., and Lomnicki, S.: Environmentally persistent free radicals: Insights on a new class of pollutants, Environ. Sci. Technol., 52, 2468–2481, https://doi.org/10.1021/acs.est.7b04439, 2018.
Venkatachari, P., Hopke, P. K., Brune, W. H., Ren, X., Lesher, R., Mao, J., and Mitchell, M.: Characterization of wintertime reactive oxygen species concentrations in Flushing, New York, Aerosol Sci. Tech., 41, 97–111, https://doi.org/10.1080/02786820601116004, 2007.
Verma, V., Shafer, M. M., Schauer, J. J., and Sioutas, C.: Contribution of transition metals in the reactive oxygen species activity of PM emissions from retrofitted heavy-duty vehicles, Atmos. Environ., 44, 5165–5173, https://doi.org/10.1016/j.atmosenv.2010.08.052, 2010.
Vinayak, A., Mudgal, G., and Singh, G. B.: Environment persistent free radicals: Long-lived particles, in: Free Radical Biology and Environmental Toxicity, Springer, 1–19, https://doi.org/10.1007/978-3-030-83446-3, 2022.
Wan, Z., Sun, Y., Tsang, D. C., Hou, D., Cao, X., Zhang, S., Gao, B., and Ok, Y. S.: Sustainable remediation with an electroactive biochar system: mechanisms and perspectives, Green. Chem., 22, 2688–2711, https://doi.org/10.1039/D0GC00717J, 2020.
Wang, L., Zhang, L., Ristovski, Z., Zheng, X., Wang, H., Li, L., Gao, J., Salimi, F., Gao, Y., and Jing, S.: Assessing the effect of reactive oxygen species and volatile organic compound profiles coming from certain types of Chinese cooking on the toxicity of human bronchial epithelial cells, Environ. Sci. Technol., 54, 8868–8877, https://doi.org/10.1021/acs.est.9b07553, 2020.
Wang, P., Pan, B., Li, H., Huang, Y., Dong, X., Ai, F., Liu, L., Wu, M., and Xing, B.: The overlooked occurrence of environmentally persistent free radicals in an area with low-rank coal burning, Xuanwei, China, Environ. Sci. Technol., 52, 1054–1061, https://doi.org/10.1021/acs.est.7b05453, 2018.
Wang, S., Song, T., Shiraiwa, M., Song, J., Ren, H., Ren, L., Wei, L., Sun, Y., Zhang, Y., and Fu, P.: Occurrence of aerosol proteinaceous matter in urban Beijing: An investigation on composition, sources, and atmospheric processes during the “APEC Blue” period, Environ. Sci. Technol., 53, 7380–7390, https://doi.org/10.1021/acs.est.9b00726, 2019.
Wang, Y., Hopke, P. K., Sun, L., Chalupa, D. C., and Utell, M. J.: Laboratory and field testing of an automated atmospheric particle-bound reactive oxygen species sampling-analysis system, J. Toxicol., 2011, 419476, https://doi.org/10.1155/2011/419476, 2011.
Wang, Y., Arellanes, C., and Paulson, S. E.: Hydrogen peroxide associated with ambient fine-mode, diesel, and biodiesel aerosol particles in Southern California, Aerosol Sci. Tech., 46, 394–402, https://doi.org/10.1080/02786826.2011.633582, 2012.
Wang, Y., Xue, Y., Tian, H., Gao, J., Chen, Y., Zhu, C., Liu, H., Wang, K., Hua, S., Liu, S., and Shao, P.: 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., Li, S., Wang, M., Sun, H., Mu, Z., Zhang, L., Li, Y., and Chen, Q.: Source apportionment of environmentally persistent free radicals (EPFRs) in PM2.5 over Xi'an, China, Sci. Total. Environ., 689, 193–202, https://doi.org/10.1016/j.scitotenv.2019.06.424, 2019.
Wang, Y., Zhang, Y., Schauer, J. J., de Foy, B., Cai, T., and Zhang, Y.: Impacts of sources on PM2.5 oxidation potential during and after the Asia-Pacific Economic Cooperation Conference in Huairou, Beijing, Environ. Sci. Technol., 54, 2585–2594, https://doi.org/10.1021/acs.est.9b05468, 2020.
Wang, Y., Yao, K., Fu, X. E., Zhai, X., Jin, L., and Guo, H.: Size-resolved exposure risk and subsequent role of environmentally persistent free radicals (EPFRs) from atmospheric particles, Atmos. Environ., 276, 119059, https://doi.org/10.1016/j.atmosenv.2022.119059, 2022.
Wei, J., Fang, T., Wong, C., Lakey, P. S. J., Nizkorodov, S. A., and Shiraiwa, M.: Superoxide formation from aqueous reactions of biogenic secondary organic aerosols, Environ. Sci. Technol., 55, 260–270, https://doi.org/10.1021/acs.est.0c07789, 2021.
Wu, S., Yang, B., Wang, X., Hong, H., and Yuan, C.: Diurnal variation of nitrated polycyclic aromatic hydrocarbons in PM10 at a roadside site in Xiamen, China, J. Environ. Sci. (China), 24, 1767–1776, https://doi.org/10.1016/S1001-0742(11)61018-8, 2012.
Xu, Y., Yang, L., Wang, X., Zheng, M., Li, C., Zhang, A., Fu, J., Yang, Y., Qin, L., Liu, X., and Liu, G.: Risk evaluation of environmentally persistent free radicals in airborne particulate matter and influence of atmospheric factors, Ecotoxicol. Environ. Saf., 196, 110571, https://doi.org/10.1016/j.ecoenv.2020.110571, 2020.
Yang, L., Liu, G., Zheng, M., Jin, R., Zhu, Q., Zhao, Y., Wu, X., and Xu, Y.: Highly elevated levels and particle-size distributions of environmentally persistent free radicals in haze-associated atmosphere, Environ. Sci. Technol., 51, 7936–7944, https://doi.org/10.1021/acs.est.7b01929, 2017.
Yang, Y., Liu, X., Qu, Y., Wang, J., An, J., Zhang, Y., and Zhang, F.: Formation mechanism of continuous extreme haze episodes in the megacity Beijing, China, in January 2013, Atmos. Res., 155, 192–203, https://doi.org/10.1016/j.atmosres.2014.11.023, 2015.
Zhang, Y., Schnelle-Kreis, J., Abbaszade, G., Zimmermann, R., Zotter, P., Shen, R., Schäfer, K., Shao, L., Prévôt, A. S. H., and Szidat, S.: Source apportionment of elemental carbon in Beijing, China: Insights from radiocarbon and organic marker measurements, Environ. Sci. Technol., 49, 8408–8415, https://doi.org/10.1021/acs.est.5b01944, 2015.
Zhao, J., Du, W., Zhang, Y., Wang, Q., Chen, C., Xu, W., Han, T., Wang, Y., Fu, P., Wang, Z., Li, Z., and Sun, Y.: Insights into aerosol chemistry during the 2015 China Victory Day parade: results from simultaneous measurements at ground level and 260 m in Beijing, Atmos. Chem. Phys., 17, 3215–3232, https://doi.org/10.5194/acp-17-3215-2017, 2017.
Zhao, K., Zhang, Y., Shang, J., Schauer, J. J., Huang, W., Tian, J., Yang, S., Fang, D., and Zhang, D.: Impact of Beijing's “Coal to Electricity” program on ambient PM2.5 and the associated reactive oxygen species (ROS), J. Environ. Sci. (China), 133, 93–106, https://doi.org/10.1016/j.jes.2022.06.038, 2023.
Zhou, J., Zotter, P., Bruns, E. A., Stefenelli, G., Bhattu, D., Brown, S., Bertrand, A., Marchand, N., Lamkaddam, H., Slowik, J. G., Prévôt, A. S. H., Baltensperger, U., Nussbaumer, T., El-Haddad, I., and Dommen, J.: Particle-bound reactive oxygen species (PB-ROS) emissions and formation pathways in residential wood smoke under different combustion and aging conditions, Atmos. Chem. Phys., 18, 6985–7000, https://doi.org/10.5194/acp-18-6985-2018, 2018.
Zhu, K., Jia, H., Zhao, S., Xia, T., Guo, X., Wang, T., and Zhu, L.: Formation of environmentally persistent free radicals on microplastics under light irradiation, Environ. Sci. Technol., 53, 8177–8186, https://doi.org/10.1021/acs.est.9b01474, 2019.
Zhu, S., Zheng, X., Stevanovic, S., Wang, L., Wang, H., Gao, J., Xiang, Z., Ristovski, Z., Liu, J., Yu, M., Wang, L., and Chen, J.: Investigating particles, VOCs, ROS produced from mosquito-repellent incense emissions and implications in SOA formation and human health, Build. Environ., 143, 645–651, https://doi.org/10.1016/j.buildenv.2018.07.053, 2018.
Short summary
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.
Environmental persistent free radicals (EPFRs) and reactive oxygen species (ROSs) play an active...
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