HIGHLIGHTS
SUMMARY
The COVID-19 outbreak has been one of the most devastating crises throughout the world since World War II. Exposure to the air with a high concentration of pollutants can increase the mortality of respiratory and cardiovascular diseases. The aim of this study was to analyze the changes in NO2, O3, SO2, and CO concentrations in 16 metropolitan areas with different development routes in China. The different responses of air pollution concentrations to the lockdown in 16 metropolitan areas during three contemporaneous time periods before and after the epidemic lockdown were analyzed and compared . . .
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