The coronavirus 2019(COVID-19)pandemic has severely affected human health and economic activity in countries around the world[1,2].To slow the spread of the COVID-19 outbreak,most countries have implemented a number of epidemic control interventions,including travel restrictions,business and industry closures,and requests for people to stay at home[2].In China,the lockdown started in Wuhan City on 23 January 2020 and vehicle movement was restricted there on 26 January 2020.These measures quickly expanded to the entire nation and lasted for＞3 weeks.Due to the abrupt and unprecedented restrictions on human activities,emissions of air pollutants were much reduced at local and national scales in China and other regions in the world during the lockdown[3-6].Recent studies found overall decreases in primary pollutants,but severe haze pollution still occurred[7,8].

Wen Xu;Yuanhong Zhao;Zhang Wen;Yunhua Chang;Yuepeng Pan;Yele Sun;Xin Ma;Zhipeng Sha;Ziyue Li;Jiahui Kang;Lei Liu;Aohan Tang;Kai Wang;Ying Zhang;Yixin Guo;Lin Zhang;Lifang Sheng;Xiuming Zhang;Baojing Gu;Yu Song;Martin Van Damme;Lieven Clarisse;Pierre-Fran?ois Coheur;Jeffrey L.Collett Jr;Keith Goulding;Fusuo Zhang;Kebin He;Xuejun Liu

College of Resources and Environmental Sciences,National Academy of Agriculture Green Development,Key Laboratory of Plant-Soil Interactions,Ministry of Education,National Observation and Research Station of Agriculture Green Development(Quzhou,Hebei),China Agricultural University,Beijing 100193,China;College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Desasters,Nanjing University of Information Science&Technology,Nanjing 200433,China;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China;Laboratory for Climate and Ocean-Atmosphere Studies,Department of Atmospheric and Oceanic Sciences,School of Physics,Peking University,Beijing 100871,China;School of Agriculture and Food,the University of Melbourne,Victoria 3010,Australia;College of Environmental and Resource Sciences,Zhejiang University,Hangzhou 310058,China;State Key Joint Laboratory of Environmental Simulation and Pollution Control,Department of Environmental Science,Peking University,Beijing 100871,China;Université libre de Bruxelles,Spectroscopy,Quantum Chemistry and Atmospheric Remote Sensing,Brussels,Belgium;Department of Atmospheric Science,Colorado State University,Fort Collins CO 80523,USA;Sustainable Agricultural Sciences Department,Rothamsted Research,Harpenden AL5 2JQ UK;School of Environment,Tsinghua University,Beijing 100084,China

科学通报（英文版）

[1]Wen Xu;Yuanhong Zhao;Zhang Wen;Yunhua Chang;Yuepeng Pan;Yele Sun;Xin Ma;Zhipeng Sha;Ziyue Li;Jiahui Kang;Lei Liu;Aohan Tang;Kai Wang;Ying Zhang;Yixin Guo;Lin Zhang;Lifang Sheng;Xiuming Zhang;Baojing Gu;Yu Song;Martin Van Damme;Lieven Clarisse;Pierre-Fran?ois Coheur;Jeffrey L.Collett Jr;Keith Goulding;Fusuo Zhang;Kebin He;Xuejun Liu-.Increasing importance of ammonia emission abatement in PM2.5 pollution control)[J].科学通报（英文版）,2022(17):1745-1749

Increasing,importance,ammonia,abatement,PM2,pollution,control,coronavirus,pandemic,has,severely,affected,human,health,economic,activity,countries,around,world,To,slow,spread,outbreak,most,have,implemented,number,epidemic,interventions,including,travel,restrictions,business,industry,closures,requests,people,stay,home,China,lockdown,started,Wuhan,City,January,vehicle,movement,was,restricted,there,These,measures,quickly,expanded,entire,lasted,weeks,Due,abrupt,unprecedented,activities,emissions,air,pollutants,were,much,reduced,local,national,scales,other,regions,during,Recent,studies,found,overall,decreases,primary,but,haze,still,occurred

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