SO2 or if it mixes with NO2 (nitrous oxide) it turns into acid rain
Sulfur Dioxide is the common name for SO3.
If it is bonded to a metal, then it is a polyatomic ion, sulfite If it is alone, then it is sulfur dioxide
Sulfur dioxide
Sulfurous acid is the common name. That chemical is merely sulfur dioxide dissolved in water and is classified as a very strong acid.
Sulfur dioxide SO2 (written with two capitals)
"Sulfur dioxide" is a phrase, not a word. This phrase is the name of a chemical compound of sulfur and oxygen with a molecular and empirical chemical formula of SO2.
Sulfur(IV) oxide/Sulfurous anhydride
The chemical formula of sulfur dioxide is SO2 (not mono and di in the same name !).
SO2 - sulphur dioxide
SO2 is Sulphut Dioxide.
Sulfur Dioxide
Burning of (vulcanized) rubber is a common way that sulfur dioxide gets into air. The sulfuric acid manufacturing factories also discharge fumes of sulfur dioxide.