Impact of the COVID-19 Lockdown on Air Quality Trends in Guiyang, Southwestern China

doi:10.3390/atmos12040422

	Impact of the COVID-19 Lockdown on Air Quality Trends in Guiyang, Southwestern China
	Su, Zhihua 1; Duan, Zongqi 2; Deng, Bing 1; Liu, Yunlong 1; Chen, Xing 1
刊名	ATMOSPHERE
	2021-04-01
卷号	12 期号:4 页码:13
关键词	COVID-19 lockdown air quality meteorological conditions Guiyang
DOI	10.3390/atmos12040422
通讯作者	Su, Zhihua(201201063@mail.gufe.edu.cn)
英文摘要	The absence of motor vehicle traffic and suspended human activities during the COVID-19 lockdown period in China produced a unique experiment to assess the efficiency of air pollution mitigation. Herein, we synthetically analyzed monitoring data of atmospheric pollutants together with meteorological parameters to investigate the impact of human activity pattern changes on air quality in Guiyang, southwestern China. The results show that the Air Quality Index (AQI) during the lockdown period decreased by 7.4% and 23.48% compared to pre-lockdown levels and the identical lunar period during the past 3 years, respectively, which exhibited optimal air quality due to reduced emissions. The sharp decrease in NO2 concentration reduced the "titration" effect and elevated the O-3 concentration by 31.94% during the lockdown period. Meteorological conditions significantly impacted air quality, and serious pollution events might also occur under emission reductions. Falling wind speeds and increasing relative humidity were the direct causes of the pollution event on February 1st. The "first rain" increases the hygroscopicity of atmospheric particulate matter and then elevate its concentration, while continuous rainfall significantly impacted the removal of atmospheric particulate matter. As impacted by the lockdown, the spatial distribution of the NO2 concentration sharply decreased on the whole, while the O-3 concentration increased significantly. The implications of this study are as follows: Measures should be formulated to prevent O-3 pollution when emission reduction measures are being adopted to improve air quality, and an emphasis should be placed on the impact of secondary aerosols formation by gas-particle conversion.
资助项目	National Natural Science Foundation of China[41964005] ; Innovative exploration and new academic seedling project of Guizhou University of Finance and Economics[2020XSXMA04]
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
语种	英语
出版者	MDPI
WOS记录号	WOS:000642720400001
资助机构	National Natural Science Foundation of China ; Innovative exploration and new academic seedling project of Guizhou University of Finance and Economics
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/161826]
专题	中国科学院地理科学与资源研究所
通讯作者	Su, Zhihua
作者单位	1.Guizhou Univ Finance & Econ, Sch Management Sci, Guiyang 550025, Peoples R China 2.Chinese Acad Sci, State Key Lab Resources & Environm Informat Syst, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Su, Zhihua,Duan, Zongqi,Deng, Bing,et al. Impact of the COVID-19 Lockdown on Air Quality Trends in Guiyang, Southwestern China[J]. ATMOSPHERE,2021,12(4):13.
APA	Su, Zhihua,Duan, Zongqi,Deng, Bing,Liu, Yunlong,&Chen, Xing.(2021).Impact of the COVID-19 Lockdown on Air Quality Trends in Guiyang, Southwestern China.ATMOSPHERE,12(4),13.
MLA	Su, Zhihua,et al."Impact of the COVID-19 Lockdown on Air Quality Trends in Guiyang, Southwestern China".ATMOSPHERE 12.4(2021):13.