Substantial nitrogen oxides emission reduction from China due to COVID-19 and its impact on surface ozone and aerosol pollution.

ABSTRACT: A top-down approach was employed to estimate the influence of lockdown measures implemented during the COVID-19 pandemic on NO_x emissions and subsequent influence on surface PM_2.5 and ozone in China. The nation-wide NO_x emission reduction of 53.4% due to the lockdown in 2020 quarter one in China may represent the current upper limit of China's NO_x emission control. During the Chinese New Year Holiday (P2), NO_x emission intensity in China declined by 44.7% compared to the preceding 3 weeks (P1). NO_x emission intensity increased by 20.3% during the 4 weeks after P2 (P3), despite the unchanged NO₂ column. It recovered to 2019 level at the end of March (P4). The East China (22°N - 42°N, 102°E - 122°E) received greater

SUBMITTER: Zhang Q 

PROVIDER: S-EPMC7474802 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature