Puzzling Haze Events in China During the Coronavirus (COVID‐19) Shutdown

It is a puzzle as to why more severe haze formed during the New Year Holiday in 2020 (NYH‐20), when China was in an unprecedented state of shutdown to contain the coronavirus (COVID‐19) outbreak, than in 2019 (NYH‐19). We performed a comprehensive measurement and modeling analysis of the aerosol che...

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Veröffentlicht in:	Geophysical research letters 2020-06, Vol.47 (12), p.n/a
Hauptverfasser:	Chang, Yunhua, Huang, Ru‐Jin, Ge, Xinlei, Huang, Xiangpeng, Hu, Jianlin, Duan, Yusen, Zou, Zhong, Liu, Xuejun, Lehmann, Moritz F.
Format:	Artikel
Sprache:	eng
Schlagworte:	Aerosol chemistry Aerosol formation Aerosols Aerosols and Particles Air quality Atmospheric chemistry Atmospheric Composition and Structure Atmospheric models Biogeosciences Coronaviridae Coronaviruses COVID-19 emission reduction Energy demand fine particle Haze Marine Pollution Megacities and Urban Environment Natural Hazards New year Nitrogen compounds Nitrogen dioxide Nitrogen oxides novel coronavirus Oceanography: Biological and Chemical Oceanography: General Outbreaks Outdoor air quality Oxidation Paleoceanography Particle formation Particulate matter Physics Pollution Pollution: Urban and Regional Pollution: Urban, Regional and Global Research Letter Research Letters Secondary aerosols Shutdowns Synergistic effect The COVID‐19 Pandemic: Linking Health, Society and Environment Transport Troposphere: Composition and Chemistry Troposphere: Constituent Transport and Chemistry Viral diseases
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Zusammenfassung:	It is a puzzle as to why more severe haze formed during the New Year Holiday in 2020 (NYH‐20), when China was in an unprecedented state of shutdown to contain the coronavirus (COVID‐19) outbreak, than in 2019 (NYH‐19). We performed a comprehensive measurement and modeling analysis of the aerosol chemistry and physics at multiple sites in China (mainly in Shanghai) before, during, and after NYH‐19 and NYH‐20. Much higher secondary aerosol fraction in PM2.5 were observed during NYH‐20 (73%) than during NYH‐19 (59%). During NYH‐20, PM2.5 levels correlated significantly with the oxidation ratio of nitrogen (r2 = 0.77, p
ISSN:	0094-8276 1944-8007
DOI:	10.1029/2020GL088533