Check the ESA Satellite imagery here (Northern Italy) to visually appreciate what has changed (this is mainly about nitrogen dioxide): https://www.esa.int/ESA_

Check the ESA Satellite imagery here (Northern Italy) to visually appreciate what has changed (this is mainly about nitrogen dioxide): https://www.esa.int/ESA_Multimedia/Videos/2020/03/Coronavirus_nitrogen_dioxide_emissions_drop_over_Italy https://www.esa.int/ESA_Multimedia/Videos/2020/03/Coronaviru...