question: During the Coronavirus disease 2019 outbreak, the Chinese government rapidly takes action to lockdown cities to prevent the spread of the virus Therefore, migrations and inner-city activities are reducing dramatically in the lockdown period In this study, we explore the correlation between human activity and air pollution by studying the changes of air pollutants between 2019 and 2020 Besides, we investigate the relationships between migration strength and air pollutants by establishing a migration-air-pollutant network Experimental results demonstrate that the changes in PM2 5, PM10, and NO2 concentration in 2020 are smaller than in 2019 However, the correlation between city activities and most air pollutants is not apparent Expect the concentration of PM2 5 in Wuhan and the concentration of SO2 in Beijing, while the migration strength is not relative to air pollutants © 2020 IEEE