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COVID-19 impact on the concentration and composition of submicron particulate matter in a typical city of Northwest China
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  • Jianzhong xu,
  • Xinlei Ge,
  • Xinghua Zhang,
  • Wenhui Zhao
Jianzhong xu
Northwest Institute of Eco-Environment and Resouces, CAS

Corresponding Author:[email protected]

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Xinlei Ge
Nanjing University of Information Science & Technology
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Xinghua Zhang
Northwest Institute of Eco-Evironment and Resource
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Wenhui Zhao
Northwest Institute of Eco-Environment and Resouces, CAS
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In this study, we evaluated the variations of air quality in Lanzhou, a typical city in Northwestern China impacted by the COVID-19 lockdown. The mass concentration and chemical composition of non-refractory submicron particulate matter (NR-PM) were determined by a high-resolution aerosol mass spectrometry from January to March 2020. The concentration of NR-PM dropped by 40% from pre- to during control period. The five aerosol components (sulfate, nitrate, ammonium, chloride, and organic aerosol (OA)) were all decreased during control period with the largest from secondary inorganic species (70% of the total reduction), whereas the OA sources did not vary synchronously. OA from coal and biomass burning remained stably from pre- to during control period, while traffic and cooking related emissions were reduced by 30% and 50%, respectively. The production rates for secondary inorganic and organic aerosols were also evaluated and represented a decreased trend from pre- to during control periods.
16 Oct 2020Published in Geophysical Research Letters volume 47 issue 19. 10.1029/2020GL089035