Effect of COVID-19 on the ambient air pollution in Tunisia during 2020 and 2021 years

Abstract

emissions during this irst con inement period (March-April, 2020) and been reduced by almost 30% in China. In Tunisia, Nitrogen dioxide (NO2), Sulfur dioxide (SO2) and Carbon monoxide (CO) showed a remarkable decrease in the North and the Center of Tunisia of more than 40% during this period mainly linked to the reduction in emissions from road traf ic and industries. Also, these pollutant gas concentrations have known a nearly 50% reduction during the 3rd pandemic wave during the period of January-April 2021.