Multiple choice Acid rain is mainly caused due to increase in the levels of SO2 only CO2 only SO2 and CO2 NO2 and SO2 Reveal answer Fill a bubble to check yourself D Correct answer Explanation Acid rain results from the emission into the atmosphere of various pollutant gases in particular sulphur dioxide (SO2) and oxides of nitrogen (NO2), which originate from the burning of fossil fuels and from motor-car exhaust fumes, respectively.