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Environ Sci Technol

Title:		Critical Role of Simultaneous Reduction of Atmospheric Odd Oxygen for Winter Haze Mitigation
Author(s):		Huang XF; Cao LM; Tian XD; Zhu Q; Saikawa E; Lin LL; Cheng Y; He LY; Hu M; Zhang YH; Lu KD; Liu YH; Daellenbach K; Slowik JG; Tang Q; Zou QL; Sun X; Xu BY; Jiang L; Shen YM; Ng NL; Prevot ASH;
Address:		"Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China. Key Laboratory of Ecological and Environmental Monitoring, Forewarning and Quality Control of Zhejiang, Zhejiang Ecological and Environmental Monitoring Center, Hangzhou 310012, China. Department of Environmental Sciences, Emory University, Atlanta, Georgia 30322, United States. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute (PSI), Villigen 5232, Switzerland. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States"
Journal Title:		Environ Sci Technol
Year:		2021
Volume:		20210825
Issue:		17
Page Number:		11557 - 11567
DOI:		10.1021/acs.est.1c03421
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
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 combustion-related volatile organic compound (VOC) reduction, odd oxygen (O(x) = O(3) + NO(2)) 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 O(x) during the lockdown usually gained a greater simultaneous PM(2.5) decrease than other provinces and cities with an increased O(x). 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 O(x) simultaneously"
Keywords:		Aerosols/analysis *Air Pollutants/analysis *Air Pollution/analysis/prevention & control *covid-19 China Communicable Disease Control Environmental Monitoring Humans Oxygen Particulate Matter/analysis SARS-CoV-2 Covid-19 VOCs atmospheric odd oxygen ozone s;
Notes:		"MedlineHuang, 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 eng 2021/08/26 Environ Sci Technol. 2021 Sep 7; 55(17):11557-11567. doi: 10.1021/acs.est.1c03421. Epub 2021 Aug 25"