Due to its high infectious, many governments have to raise a series of control measures to restrict human activities and prevent the spread of epidemic. Until August 22, more than 22.81 million confirmed COVID‐19 cases and 790 thousand deaths worldwide ( ). It is highly imperative to propose more coordinated air pollution control strategies to control O 3 pollution.Īs a highly contagious respiratory virus, Coronavirus Disease 2019 (COVID‐19) was first reported in Wuhan during the first half December 2019 and then spread to more than 200 countries around the world (Li et al., 2020 Zu et al., 2020). The natural experiment demonstrated the drastic emission reduction measures could significantly decrease the NO 2, SO 2, and CO concentrations, while they significantly elevated the O 3 concentration. However, the increases of all‐cause, CVD, RD, and COPD mortalities due to O 3 increase during COVID‐19 lockdown period achieved 462 (250–674), 79 (29–129), 40 (−25–105), and 52 (−34–138) cases.
The avoided premature all‐cause, cardiovascular disease (CVD), respiratory disease (RD), and chronic obstructive pulmonary disease (COPD) mortalities induced by NO 2 decrease during COVID‐19 lockdown period reached 3,954 (3,076–4,832), 635 (468–801), 612 (459–765), and 920 (653–1,186) cases. Nonetheless, the predicted 8‐h O 3 concentrations across China suffered from 1.29% increases during this period. The results suggested that estimated NO 2, SO 2, and CO concentrations in China during January 23–Madecreased by 13.68%, 25.71%, and 7.42%, respectively compared with the same periods in 2018–2019. Here, a random forest model was applied to assess the impact of COVID‐19 lockdown on pollutant concentrations and potential health effects.
Nevertheless, however, the changes of gaseous pollutant concentrations and health effects across China during the COVID‐19 lockdown period remained poorly understood. The human movement and economic activities have been drastically reduced due to the Coronavirus Disease 2019 (COVID‐19) outbreak, leading to the sharp decreases of pollutant emissions and remarkable air quality improvement.
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