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Environ Pollut

Title:		"Opposite impact of emission reduction during the COVID-19 lockdown period on the surface concentrations of PM(2.5) and O(3) in Wuhan, China"
Author(s):		Yin H; Liu C; Hu Q; Liu T; Wang S; Gao M; Xu S; Zhang C; Su W;
Address:		"Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China; Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, China. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China; Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230026, China; Anhui Province Key Laboratory of Polar Environment and Global Change, University of Science and Technology of China, Hefei, 230026, China. Electronic address: chliu81@ustc.edu.cn. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China. School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China. Department of Geography, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China. Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, China"
Journal Title:		Environ Pollut
Year:		2021
Volume:		20210802
Issue:
Page Number:		117899 -
DOI:		10.1016/j.envpol.2021.117899
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Print) 0269-7491 (Linking)
Abstract:		"To prevent the spread of the COVID-19 epidemic, the Chinese megacity Wuhan has taken emergent lockdown measures starting on January 23, 2020. This provided a natural experiment to investigate the response of air quality to such emission reductions. Here, we decoupled the influence of meteorological and non-meteorological factors on main air pollutants using generalized additive models (GAMs), driven by data from the China National Environmental Monitoring Center (CNEMC) network. During the lockdown period (Jan. 23 - Apr. 8, 2020), PM(2.5), PM(10), NO(2), SO(2), and CO concentrations decreased significantly by 45 %, 49 %, 56 %, 39 %, and 18 % compared with the corresponding period in 2015-2019, with contributions by S(meteos) of 15 %, 17 %, 13 %, 10 %, and 6 %. This indicates an emission reduction of NO(x) at least 43 %. However, O(3) increased by 43 % with a contribution by S(meteos) of 6 %. In spite of the reduced volatile organic compound (VOC) emissions by 30 % during the strict lockdown period (Jan. 23 - Feb. 14, 2020), which likely reduced the production of O(3), O(3) concentrations increased due to a weakening of the titration effect of NO. Our results suggest that conventional emission reduction (NO(x) reduction only) measures may not be sufficient to reduce (or even lead to an increase of) surface O(3) concentrations, even if reaching the limit, and VOC-specific measures should also be taken"
Keywords:		*Air Pollutants/analysis *Air Pollution/analysis/prevention & control *covid-19 China Communicable Disease Control Environmental Monitoring Humans Particulate Matter/analysis SARS-CoV-2 Atmospheric pollution Generalized additive models Meteorological fact;
Notes:		"MedlineYin, Hao Liu, Cheng Hu, Qihou Liu, Ting Wang, Shuntian Gao, Meng Xu, Shiqi Zhang, Chengxin Su, Wenjing eng England 2021/08/07 Environ Pollut. 2021 Nov 15; 289:117899. doi: 10.1016/j.envpol.2021.117899. Epub 2021 Aug 2"