Opposite impact of emission reduction during the COVID-19 lockdown period on the surface concentrations of PM2.5 and O-3 in Wuhan, China

doi:10.1016/j.envpol.2021.117899

	Opposite impact of emission reduction during the COVID-19 lockdown period on the surface concentrations of PM2.5 and O-3 in Wuhan, China
	Yin, Hao 1,2; Liu, Cheng 1,2,3,4,5; Hu, Qihou 1; Liu, Ting 7; Wang, Shuntian 1,2; Gao, Meng 6; Xu, Shiqi 7; Zhang, Chengxin 2; Su, Wenjing 7
刊名	ENVIRONMENTAL POLLUTION
	2021-11-15
卷号	289
关键词	Generalized additive models Meteorological factors influence Atmospheric pollution Titration effect VOC reduction
ISSN号	0269-7491
DOI	10.1016/j.envpol.2021.117899
通讯作者	Liu, Cheng(chliu81@ustc.edu.cn)
英文摘要	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), PM2.5, PM10, NO2, SO2, 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 NCL, 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 (NOx 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.
资助项目	National Key Research and Development Program of China[2017YFC0210002] ; National Key Research and Development Program of China[2018YFC0213104] ; National Key Research and Development Program of China[2016YFC0203302] ; National Key Research and Development Program of China[2017YFC0212800] ; National Key Research and Development Program of China[2019YFC0214802] ; Chinese Academy of Engineering Grant[2020-ZD-15] ; National Natural Science Foundation of China[41722501] ; National Natural Science Foundation of China[51778596] ; National Natural Science Foundation of China[41977184] ; National Natural Science Foundation of China[41941011] ; Anhui Science and Technology Major Project[18030801111] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23020301] ; National Key Project for Causes and Control of Heavy Air Pollution[DQGG0102] ; National Key Project for Causes and Control of Heavy Air Pollution[DQGG0205] ; Major Projects of High Resolution Earth Observation Systems of National Science and Technology[05-Y30B01-9001-19/20-3]
WOS关键词	PARTICULATE MATTER PM2.5 ; BOUNDARY-LAYER OZONE ; METEOROLOGICAL CONDITIONS ; AIR-QUALITY ; HETEROGENEOUS CHEMISTRY ; CLIMATE-CHANGE ; SUBURBAN SITE ; POLLUTION ; SENSITIVITY ; VARIABILITY
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000696651300008
资助机构	National Key Research and Development Program of China ; Chinese Academy of Engineering Grant ; National Natural Science Foundation of China ; Anhui Science and Technology Major Project ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Key Project for Causes and Control of Heavy Air Pollution ; Major Projects of High Resolution Earth Observation Systems of National Science and Technology
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/125311]
专题	中国科学院合肥物质科学研究院
通讯作者	Liu, Cheng
作者单位	1.Chinese Acad Sci, HFIPS, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Dept Precis Machinery & Precis Instrumentat, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China 4.Univ Sci & Technol China, Key Lab Precis Sci Instrumentat Anhui Higher Educ, Hefei 230026, Peoples R China 5.Univ Sci & Technol China, Anhui Prov Key Lab Polar Environm & Global Change, Hefei 230026, Peoples R China 6.Hong Kong Baptist Univ, Dept Geog, Kowloon Tong, Hong Kong, Peoples R China 7.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Yin, Hao,Liu, Cheng,Hu, Qihou,et al. Opposite impact of emission reduction during the COVID-19 lockdown period on the surface concentrations of PM2.5 and O-3 in Wuhan, China[J]. ENVIRONMENTAL POLLUTION,2021,289.
APA	Yin, Hao.,Liu, Cheng.,Hu, Qihou.,Liu, Ting.,Wang, Shuntian.,...&Su, Wenjing.(2021).Opposite impact of emission reduction during the COVID-19 lockdown period on the surface concentrations of PM2.5 and O-3 in Wuhan, China.ENVIRONMENTAL POLLUTION,289.
MLA	Yin, Hao,et al."Opposite impact of emission reduction during the COVID-19 lockdown period on the surface concentrations of PM2.5 and O-3 in Wuhan, China".ENVIRONMENTAL POLLUTION 289(2021).