The Response in Air Quality to the Reduction of Chinese Economic Activities During the COVID‐19 Outbreak

During the COVID‐19 outbreak that took place in early 2020, the economic activities in China were drastically reduced and accompanied by a strong reduction in the emission of primary air pollutants. On the basis of measurements made at the monitoring stations operated by the China National Environmental Monitoring Center, we quantify the reduction in surface PM 2.5 , NO 2 , CO, and SO 2 concentrations in northern China during the lockdown, which...