| Title | Critical Role of Simultaneous Reduction of Atmospheric Odd Oxygen for Winter Haze Mitigation |
| Authors | Huang, Xiao-Feng Cao, Li-Ming Tian, Xu-Dong Zhu, Qiao Saikawa, Eri Lin, Li-Liang Cheng, Yong He, Ling-Yan Hu, Min Zhang, Yuan-Hang Lu, Ke-Ding Liu, Yu-Han Daellenbach, Kaspar Slowik, Jay G. Tang, Qian Zou, Qiao-Li Sun, Xin Xu, Bing-Ye Jiang, Lan Shen, Ye-Min Ng, Nga Lee Prevot, Andre S. H. |
| Affiliation | Peking Univ Shenzhen Grad Sch, Sch Environm & Energy, Key Lab Urban Habitat Environm Sci & Technol, Shenzhen 518055, Peoples R China Emory Univ, Dept Environm Sci, Atlanta, GA 30322 USA Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China Paul Scherrer Inst PSI, Lab Atmospher Chem, CH-5232 Villigen, Switzerland Zhejiang Ecol & Environm Monitoring Ctr, Key Lab Ecol & Environm Monitoring Forewarning &, Hangzhou 310012, Peoples R China Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA |
| Keywords | POSITIVE MATRIX FACTORIZATION SOURCE APPORTIONMENT ORGANIC AEROSOL MULTILINEAR ENGINE OZONE FORMATION EMISSIONS POLLUTION CHINA COMPONENTS NOX |
| Issue Date | 7-Sep-2021 |
| Publisher | ENVIRONMENTAL SCIENCE & TECHNOLOGY |
| Abstract | The lockdown due to COVID-19 created a rare opportunity to examine the nonlinear responses of secondary aerosols, which are formed through atmospheric oxidation of gaseous precursors, to intensive precursor emission reductions. Based on unique observational data sets from six supersites in eastern China during 2019-2021, we found that the lockdown caused considerable decreases (32-61%) in different secondary aerosol components in the study region because of similar-degree precursor reductions. However, due to insufficient combustionrelated volatile organic compound (VOC) reduction, odd oxygen (O-x = O-3 + NO2) concentration, an indicator of the extent of photochemical processing, showed little change and did not promote more decreases in secondary aerosols. We also found that the Chinese provinces and international cities that experienced reduced Ox during the lockdown usually gained a greater simultaneous PM2.5 decrease than other provinces and cities with an increased Ox. Therefore, we argue that strict VOC control in winter, which has been largely ignored so far, is critical in future policies to mitigate winter haze more efficiently by reducing Ox simultaneously. |
| URI | http://hdl.handle.net/20.500.11897/624618 |
| ISSN | 0013-936X |
| DOI | 10.1021/acs.est.1c03421 |
| Indexed | SCI(E) |
| Appears in Collections: | 深圳研究生院待认领 环境科学与工程学院 环境模拟与污染控制国家重点联合实验室 |
