TY  - Data
T1  - COVID‐19 Impact on the Concentration and Composition of Submicron Particulate Matter in a Typical City of Northwest China
A1  - Xu Jianzhong 
DO  - 10.5281/zenodo.3855067
PY  - 2023
DA  - 2023-07-25
PB  - National Cryosphere Desert Data Center
AB  - &Emsp;In this study, we evaluated the variations of air quality in Lanzhou, a typical city inNorthwestern China impacted by the COVID‐19 lockdown. The mass concentration and chemicalcomposition of non‐refractory submicron particulate matter （NR-PM1）were determined by ahigh‐resolution aerosol mass spectrometer during January‐March 2020. The concentration of NR‐PM1dropped by 50% from before to during control period. The five aerosol components (sulfate, nitrate,ammonium, chloride, and organic aerosol [OA]) all decreased during the control period with the biggestdecrease observed for secondary inorganic species (70% of the total reduction). Though the massconcentration of OA decreased during the control period, its source emissions varied differently. OA fromcoal and biomass burning remained stable from before to during control period, while traffic andcooking related emissions were reduced by 25% and 50%, respectively. The low concentration during thecontrol period was attributed to the lower production rate for secondary aerosols.
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/92db9bdb-7d0d-4dff-8f91-a98c6957490d
ER  -