| Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China | |
| Le, Tianhao1; Wang, Yuan1; Liu, Lang2,3; Yang, Jiani1; Yung, Yuk L.1; Li, Guohui2,3; Seinfeld, John H.4,5 | |
| Corresponding Author | Wang, Yuan(yuan.wang@caltech.edu) |
| 2020-08-07 | |
| Source Publication | SCIENCE
 |
| ISSN | 0036-8075 |
| Volume | 369Issue:6504Pages:702-+ |
| Abstract | 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. |
| DOI | 10.1126/science.abb7431 |
| WOS Keyword | MEXICO-CITY ; MODELING SYSTEM ; APEC BLUE ; AEROSOLS ; HAZE ; HONO ; PHOTOCHEMISTRY ; GASES |
| Indexed By | SCI ; SCI |
| Language | 英语 |
| Funding Project | NSF[AGS-1700727] ; National Key RD Plan[2017YFC0210000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB40030203] ; Jet Propulsion Laboratory, California Institute of Technology ; NASA |
| WOS Research Area | Science & Technology - Other Topics |
| Funding Organization | NSF ; National Key RD Plan ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Jet Propulsion Laboratory, California Institute of Technology ; NASA |
| WOS Subject | Multidisciplinary Sciences |
| WOS ID | WOS:000559184400048 |
| Publisher | AMER ASSOC ADVANCEMENT SCIENCE |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ieecas.cn/handle/361006/15154 |
| Collection | 粉尘与环境研究室 |
| Corresponding Author | Wang, Yuan |
| Affiliation | 1.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA 2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian, Shaanxi, Peoples R China 4.CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA 5.CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA |
| Recommended Citation GB/T 7714 | Le, Tianhao,Wang, Yuan,Liu, Lang,et al. Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China[J]. SCIENCE,2020,369(6504):702-+. |
| APA | Le, Tianhao.,Wang, Yuan.,Liu, Lang.,Yang, Jiani.,Yung, Yuk L..,...&Seinfeld, John H..(2020).Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China.SCIENCE,369(6504),702-+. |
| MLA | Le, Tianhao,et al."Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China".SCIENCE 369.6504(2020):702-+. |
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