Name: Sulphur dioxide Synonyms: Sulfur(IV) oxide,Sulfurous anhydride Molecular Formula: SO2 CAS Registry Number: 7446-9-5 Sulfur dioxide (also sulphur dioxide) is the chemical compound with the formula SO2. It is produced by volcanoes and in various industrial processes. Since coal and petroleum often contain sulfur compounds, their combustion generates sulfur dioxide. Further oxidation of SO2, usually in the presence of a catalyst such as NO2, forms H2SO4, and thus acid rain. This is one of the causes for concern over the environmental impact of the use of these fuels as power sources. E220,7446-9-5,231-195-2,Sulphur dioxide,Sulfur(IV) oxide,Sulfurous anhydride,Sulphur dioxide preservative,Sulphur dioxide supplier,Sulphur dioxide manufacturer,Sulphur dioxide exporter,Sulphur dioxide importer,Sulphur dioxide distributor