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Chemistry of Atmospheric Fine Particles During the COVID-19 Pandemic in a Megacity of Eastern China.


ABSTRACT: Air pollution in megacities represents one of the greatest environmental challenges. Our observed results show that the dramatic NOx decrease (77%) led to significant O3 increases (a factor of 2) during the COVID-19 lockdown in megacity Hangzhou, China. Model simulations further demonstrate large increases of daytime OH and HO2 radicals and nighttime NO3 radical, which can promote the gas-phase reaction and nocturnal multiphase chemistry. Therefore, enhanced NO3 - and SO4 2- formation was observed during the COVID-19 lockdown because of the enhanced oxidizing capacity. The PM2.5 decrease was only partially offset by enhanced aerosol formation with its reduction reaching 50%. In particular, NO3 - decreased largely by 68%. PM2.5 chemical analysis reveals that vehicular emissions mainly contributed to PM2.5 under normal conditions in Hangzhou. Whereas, stationary sources dominated the residual PM2.5 during the COVID-19 lockdown. This study provides evidence that large reductions in vehicular emissions can effectively mitigate air pollution in megacities.

SUBMITTER: Liu L 

PROVIDER: S-EPMC7883225 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Chemistry of Atmospheric Fine Particles During the COVID-19 Pandemic in a Megacity of Eastern China.

Liu Lei L   Zhang Jian J   Du Rongguang R   Teng Xiaomi X   Hu Rui R   Yuan Qi Q   Tang Shanshan S   Ren Chuanhua C   Huang Xin X   Xu Liang L   Zhang Yinxiao Y   Zhang Xiaoye X   Song Congbo C   Liu Bowen B   Lu Gongda G   Shi Zongbo Z   Li Weijun W  

Geophysical research letters 20210118 2


Air pollution in megacities represents one of the greatest environmental challenges. Our observed results show that the dramatic NO<sub>x</sub> decrease (77%) led to significant O<sub>3</sub> increases (a factor of 2) during the COVID-19 lockdown in megacity Hangzhou, China. Model simulations further demonstrate large increases of daytime OH and HO<sub>2</sub> radicals and nighttime NO<sub>3</sub> radical, which can promote the gas-phase reaction and nocturnal multiphase chemistry. Therefore, en  ...[more]

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