Nonlinear impact of COVID-19 on pollutions – Evidence from Wuhan, New York, Milan, Madrid, Bandra, London, Tokyo and Mexico City

The majority of existing COVID-19 and pollution research are from a linear perspective, ignoring the nonlinear relationship between COVID-19 and pollution. This work is aimed to systematically investigate the nonlinear impact of COVID-19 lockdown on four typical pollutants (NO2, PM2.5, O3 and SO2) in the selected eight cities (Wuhan of China, New York of the United States, Milan of Italy, Madrid of Spain, Bandra of India, London of United...