气候变化领域集成服务门户(CCPortal): Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China

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DOI	10.1126/science.abb7431
	Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China
	Le T.; Wang Y.; Liu L.; Yang J.; Yung Y.L.; Li G.; Seinfeld J.H.
发表日期	2020
ISSN	0036-8075
起始页码	702
结束页码	706
卷号	369 期号:6504
英文摘要	The absence of motor vehicle traffic and suspended manufacturing during the coronavirus disease 2019 (COVID-19) pandemic in China enabled assessment of the efficiency of air pollution mitigation. Up to 90% reduction of certain emissions during the city-lockdown period can be identified from satellite and ground-based observations. Unexpectedly, extreme particulate matter levels simultaneously occurred in northern China. Our synergistic observation analyses and model simulations show that anomalously high humidity promoted aerosol heterogeneous chemistry, along with stagnant airflow and uninterrupted emissions from power plants and petrochemical facilities, contributing to severe haze formation. Also, because of nonlinear production chemistry and titration of ozone in winter, reduced nitrogen oxides resulted in ozone enhancement in urban areas, further increasing the atmospheric oxidizing capacity and facilitating secondary aerosol formation. © 2020 American Association for the Advancement of Science. All rights reserved.
英文关键词	ozone; volatile organic compound; nitrogen dioxide; sulfur dioxide; airflow; atmospheric pollution; haze; humidity; industrial emission; nitrogen oxides; particulate matter; petrochemical industry; satellite altimetry; synergism; traffic emission; air pollution; Article; chemical composition; China; coronavirus disease 2019; environmental impact assessment; environmental monitoring; epidemic; exhaust gas; humidity; particulate matter; photochemistry; population research; precipitation; priority journal; seasonal variation; urban area; winter; Betacoronavirus; computer simulation; Coronavirus infection; human; meteorological phenomena; pandemic; virus pneumonia; weather; wind; China; Coronavirus; Air Pollution; Betacoronavirus; China; Computer Simulation; Coronavirus Infections; Disease Outbreaks; Humans; Humidity; Meteorological Concepts; Nitrogen Dioxide; Ozone; Pandemics; Particulate Matter; Pneumonia, Viral; Sulfur Dioxide; Weather; Wind
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/244476
作者单位	Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, Shaanxi, China; Key Lab of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, Shaanxi, China; Divisions of Chemistry and Chemical Engineering and Engineering and Applied Science, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Le T.,Wang Y.,Liu L.,et al. Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China[J],2020,369(6504).
APA	Le T..,Wang Y..,Liu L..,Yang J..,Yung Y.L..,...&Seinfeld J.H..(2020).Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China.Science,369(6504).
MLA	Le T.,et al."Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China".Science 369.6504(2020).