Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China

doi:10.1126/science.abb7431

GSTDTAP > 气候变化

DOI	10.1126/science.abb7431
	Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China
	Tianhao Le; Yuan Wang; Lang Liu; Jiani Yang; Yuk L. Yung; Guohui Li; John H. Seinfeld
	2020-08-07
发表期刊	Science
出版年	2020
英文摘要	The lockdown enforced in most cities in China in response to the outbreak of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) resulted in the virtual absence of motor vehicle traffic and sharply reduced manufacturing activity for several weeks. Le et al. report some of the anticipated and unanticipated effects that this had on air pollution there, including unexpectedly high levels of particulate matter abundances and severe haze formation in some areas. This natural experiment will help in the assessment of air pollution mitigation strategies. Science , this issue p. [702][1] 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. [1]: /lookup/doi/10.1126/science.abb7431
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/288019
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Tianhao Le,Yuan Wang,Lang Liu,et al. Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China[J]. Science,2020.
APA	Tianhao Le.,Yuan Wang.,Lang Liu.,Jiani Yang.,Yuk L. Yung.,...&John H. Seinfeld.(2020).Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China.Science.
MLA	Tianhao Le,et al."Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China".Science (2020).