气候变化领域集成服务门户(CCPortal): Substantial changes in gaseous pollutants and chemical compositions in fine particles in the North China Plain during the COVID-19 lockdown period: Anthropogenic vs. meteorological influences

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DOI	10.5194/acp-21-8677-2021
	Substantial changes in gaseous pollutants and chemical compositions in fine particles in the North China Plain during the COVID-19 lockdown period: Anthropogenic vs. meteorological influences
	Li R.; Zhao Y.; Fu H.; Chen J.; Peng M.; Wang C.
发表日期	2021
ISSN	1680-7316
起始页码	8677
结束页码	8692
卷号	21 期号:11
英文摘要	The rapid response to the COVID-19 pandemic led to unprecedented decreases in economic activities, thereby reducing the pollutant emissions. A random forest (RF) model was applied to determine the respective contributions of meteorology and anthropogenic emissions to the changes in air quality. The result suggested that the strict lockdown measures significantly decreased primary components such as Cr (-67 %) and Fe (-61 %) in PM2:5 (p < 0:01), whereas the higher relative humidity (RH) and NH3 level and the lower air temperature (T) remarkably enhanced the production of secondary aerosol, including SO24-(29 %), NO-3 (29 %), and NHC 4 (21 %) (p < 0:05). The positive matrix factorization (PMF) result suggested that the contribution ratios of secondary formation (SF), industrial process (IP), biomass burning (BB), coal combustion (CC), and road dust (RD) changed from 36 %, 27 %, 21 %, 12 %, and 4 % before the COVID-19 outbreak to 44 %, 20 %, 20 %, 9 %, and 7 %, respectively. The rapid increase in the contribution ratio derived from SF to PM2:5 implied that the intermittent haze events during the COVID-19 period were characterized by secondary aerosol pollution, which was mainly contributed by the unfavorable meteorological conditions and high NH3 level. © 2021 Rui Li et al.
语种	英语
scopus关键词	aerosol; air quality; anthropogenic source; atmospheric pollution; chemical composition; chemical pollutant; COVID-19; disease control; emission inventory; pollution monitoring; China; North China Plain
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246828
作者单位	Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science and Technology, Nanjing, 210044, China; School of Law of Tsinghua University, Beijing, 100084, China; Hebei Xianhe Environmental Protection Technology Co. Ltd, Shijiazhuang, 050035, China
推荐引用方式 GB/T 7714	Li R.,Zhao Y.,Fu H.,et al. Substantial changes in gaseous pollutants and chemical compositions in fine particles in the North China Plain during the COVID-19 lockdown period: Anthropogenic vs. meteorological influences[J],2021,21(11).
APA	Li R.,Zhao Y.,Fu H.,Chen J.,Peng M.,&Wang C..(2021).Substantial changes in gaseous pollutants and chemical compositions in fine particles in the North China Plain during the COVID-19 lockdown period: Anthropogenic vs. meteorological influences.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(11).
MLA	Li R.,et al."Substantial changes in gaseous pollutants and chemical compositions in fine particles in the North China Plain during the COVID-19 lockdown period: Anthropogenic vs. meteorological influences".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.11(2021).