Sulfur dioxide pollutants can be generated in the form of aerosols and acid rain. Acid rain is a type of acid deposition which results from the rain with has a pH of 5.7 (or even more acid). The process of oxidation of sulfur-containing compounds is the main cause for the generation of sulfur dioxide pollutants that are released into the atmosphere by human activities (e.g., as a combustion product from burning coal and other fossil fuels).
