气候变化领域集成服务门户(CCPortal): Global, continental, and national variation in PM2.5, O-3, and NO2 concentrations during the early 2020 COVID-19 lockdown

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DOI	10.1016/j.apr.2021.02.002
	Global, continental, and national variation in PM2.5, O-3, and NO2 concentrations during the early 2020 COVID-19 lockdown
	He, Chao; Hong, Song; Zhang, Lu; Mu, Hang; Xin, Aixuan; Zhou, Yiqi; Liu, Jinke; Liu, Nanjian; Su, Yuming; Tian, Ya; Ke, Biqin; Wang, Yanwen; Yang, Lu
通讯作者	Hong, S ; Yang, L (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
发表日期	2021
ISSN	1309-1042
起始页码	136
结束页码	145
卷号	12 期号:3
英文摘要	Lockdowns implemented in response to COVID-19 have caused an unprecedented reduction in global economic and transport activity. In this study, variation in the concentration of health-threatening air pollutants (PM2.5, NO2, and O-3) pre- and post-lockdown was investigated at global, continental, and national scales. We analyzed ground-based data from >10,000 monitoring stations in 380 cities across the globe. Global-scale results during lockdown (March to May 2020) showed that concentrations of PM2.5 and NO2 decreased by 16.1% and 45.8%, respectively, compared to the baseline period (2015-2019). However, O-3 concentration increased by 5.4%. At the continental scale, concentrations of PM2.5 and NO2 substantially dropped in 2020 across all continents during lockdown compared to the baseline, with a maximum reduction of 20.4% for PM2.5 in East Asia and 42.5% for NO2 in Europe. The maximum reduction in O-3 was observed in North America (7.8%), followed by Asia (0.7%), while small increases were found in other continents. At the national scale, PM2.5 and NO2 concentrations decreased significantly during lockdown, but O-3 concentration showed varying patterns among countries. We found maximum reductions of 50.8% for PM2.5 in India and 103.5% for NO2 in Spain. The maximum reduction in O-3 (22.5%) was found in India. Improvements in air quality were temporary as pollution levels increased in cities since lockdowns were lifted. We posit that these unprecedented changes in air pollutants were mainly attributable to reductions in traffic and industrial activities. Column reductions could also be explained by meteorological variability and a decline in emissions caused by environmental policy regulations. Our results have implications for the continued implementation of strict air quality policies and emission control strategies to improve environmental and human health.
英文关键词	Air pollution; Confinement; COVID-19; Ground-level data; Lockdown
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000631783000003
来源期刊	ATMOSPHERIC POLLUTION RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255158
作者单位	[He, Chao; Hong, Song; Mu, Hang; Xin, Aixuan; Su, Yuming; Tian, Ya; Ke, Biqin; Yang, Lu] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China; [Zhang, Lu] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China; [Zhou, Yiqi; Liu, Jinke; Liu, Nanjian] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Zhou, Yiqi] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China; [Liu, Jinke] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Cryosphere Res Stn Qinghai Tibet Plateau, Lanzhou 730000, Gansu, Peoples R China; [Liu, Nanjian] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China; [Wang, Yanwen] China Univ Geosci, Econ & Management Coll, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	He, Chao,Hong, Song,Zhang, Lu,et al. Global, continental, and national variation in PM2.5, O-3, and NO2 concentrations during the early 2020 COVID-19 lockdown[J]. 中国科学院西北生态环境资源研究院,2021,12(3).
APA	He, Chao.,Hong, Song.,Zhang, Lu.,Mu, Hang.,Xin, Aixuan.,...&Yang, Lu.(2021).Global, continental, and national variation in PM2.5, O-3, and NO2 concentrations during the early 2020 COVID-19 lockdown.ATMOSPHERIC POLLUTION RESEARCH,12(3).
MLA	He, Chao,et al."Global, continental, and national variation in PM2.5, O-3, and NO2 concentrations during the early 2020 COVID-19 lockdown".ATMOSPHERIC POLLUTION RESEARCH 12.3(2021).