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Non-negligible impacts of clean air regulations on the reduction of tropospheric NO2 over East China during the COVID-19 pandemic observed by OMI and TROPOMI.
Huang, Guanyu; Sun, Kang.
  • Huang G; Environmental and Health Sciences Program, Spelman College, 350 Spelman LN SW, Atlanta, GA 30314, USA. Electronic address: ghuang@spelman.edu.
  • Sun K; Department of Civil, Structural and Environmental Engineering, University at Buffalo, 212 Ketter Hall, Buffalo, NY 14228, USA; Research and Education in eNergy, Environment and Water (RENEW) Institute, University at Buffalo, 112 Cooke Hall, Buffalo, NY 14228, USA. Electronic address: kangsun@buffalo.edu.
Sci Total Environ ; 745: 141023, 2020 Nov 25.
Article in English | MEDLINE | ID: covidwho-663983
ABSTRACT
We study the variation of tropospheric NO2 vertical column densities (TropNO2VCDs) over East China during the 2005-2020 lunar new year (LNY) holiday seasons to understand factors on the reduction of tropospheric NO2 during the outbreak of COVID-19 in East China using Ozone Monitoring Instrument (OMI) and TROPOspheric Monitoring Instrument (TROPOMI) observations. TropNO2VCDs from OMI and TROPOMI reveal sharp reductions of 33%-72% during 2020 LNY holiday season and the co-occurring outbreak of COVID-19 relative to the climatological mean of 2005-2019 LNY holiday seasons, and 22%-67% reduction relative to the 2019 LNY holiday season. These reductions of TropNO2VCD occur majorly over highly polluted metropolitan areas with condensed industrial and transportation emission sources. COVID-19 control measures including lockdowns and shelter-in-place regulations are the primary reason for these tropospheric NO2 reductions over most areas of East China in 2020 LNY holiday season relative to the 2019 LNY holiday season, as COVID-19 control measures may explain ~87%-90% of tropospheric NO2 reduction in Wuhan as well as ~62%-89% in Beijing, Yangtze River Delta (YRD) and Sichuan Basin areas. The clean air regulation of China also contributes significantly to reductions of tropospheric NO2 simultaneously and is the primary factor in the Pearl River Delta (PRD) area, by explaining ~56%-63% of the tropospheric NO2 reduction there.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Ozone / Pneumonia, Viral / Coronavirus Infections / Air Pollutants / Pandemics Type of study: Experimental Studies / Observational study / Prognostic study Limits: Humans Country/Region as subject: Asia Language: English Journal: Sci Total Environ Year: 2020 Document Type: Article

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Ozone / Pneumonia, Viral / Coronavirus Infections / Air Pollutants / Pandemics Type of study: Experimental Studies / Observational study / Prognostic study Limits: Humans Country/Region as subject: Asia Language: English Journal: Sci Total Environ Year: 2020 Document Type: Article