Impact of quarantine measures on chemical compositions of PM_2.5 during the COVID-19 epidemic in Shanghai, China.

ABSTRACT: The COVID-19 epidemic broke out in Wuhan, Hubei in December 2019 and in January 2020 and was later transmitted to the entire country. Quarantine measures during Chinese New Year effectively alleviated the spread of the epidemic, but they simultaneously resulted in a decline in anthropogenic emissions from industry, transportation, and import and export of goods. Herein, we present the major chemical composition of non-refractory PM_2.5 (NR-PM_2.5) and the concentrations of gaseous pollutants in an urban site in Shanghai before and during the quarantine period of the COVID-19 epidemic, which was Jan. 8-23 and Jan. 24-Feb. 8, respectively. The observed results show that the reduction in PM_2.5 can be mainly attributed to decreasing concentrations of nitrate and

SUBMITTER: Chen H 

PROVIDER: S-EPMC7336916 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature