气候变化领域集成服务门户(CCPortal): COVID-19 Induced Fingerprints of a New Normal Urban Air Quality in the United States

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DOI	10.1029/2021JD034797
	COVID-19 Induced Fingerprints of a New Normal Urban Air Quality in the United States
	Kondragunta S.; Wei Z.; McDonald B.C.; Goldberg D.L.; Tong D.Q.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:17
英文摘要	Most countries around the world, including the United States, took actions to control COVID-19 spread that led to an abrupt shift in human activity. On-road NOx emissions from light and heavy-duty vehicles decreased by 9%–19% between February and March at the onset of the lockdown period in the middle of March in most of the US; between March and April, the on-road NOx emissions dropped further by 8%–31% when lockdown measures were most stringent. These precipitous drops in NOx emissions correlated well (r = 0.75) with tropospheric NO2 column amount observed by the Sentinel 5 Precursor TROPOspheric Monitoring Instrument (S5P TROPOMI). Furthermore, the changes in TROPOMI tropospheric NO2 column amount across continental US between 2020 and 2019 correlated well with the changes in on-road NOx emissions (r = 0.68) but correlated weakly with changes in emissions from the power plants (r = 0.35). At the height of lockdown-related unemployment in the second quarter of 2020, the tropospheric NO2 column values decreased at the rate of 0.8 µmoles/m2 per unit percentage increase in the unemployment rate. Despite the lifting of lockdown measures, parts of the US continued to have ∼20% below normal on-road NOx emissions. To achieve this new normal urban air quality in the US, continuing remote work policies that do not impede economic growth may become one of the many options. © 2021 The Authors. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
英文关键词	aerosol optical depth; air quality; COVID-19; nitrogen dioxide; NOx emissions; power plants; TROPOMI
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237024
作者单位	NOAA NESDIS Center for Satellite Applications and Research, College Park, MD, United States; IM Systems Group, College Park, MD, United States; NOAA Chemical Systems Laboratory, Boulder, CO, United States; Milken School of Public Health, George Washington University, Washington, DC, United States; Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA, United States
推荐引用方式 GB/T 7714	Kondragunta S.,Wei Z.,McDonald B.C.,et al. COVID-19 Induced Fingerprints of a New Normal Urban Air Quality in the United States[J],2021,126(17).
APA	Kondragunta S.,Wei Z.,McDonald B.C.,Goldberg D.L.,&Tong D.Q..(2021).COVID-19 Induced Fingerprints of a New Normal Urban Air Quality in the United States.Journal of Geophysical Research: Atmospheres,126(17).
MLA	Kondragunta S.,et al."COVID-19 Induced Fingerprints of a New Normal Urban Air Quality in the United States".Journal of Geophysical Research: Atmospheres 126.17(2021).