1.1 What is sulfur dioxide?
Sulfur dioxide is a colorless gas with a pungent odor It is a liquid when under pressure Sulfur dioxide dissolves in water very easily It cannot catch fire.
Sulfur dioxide in the air results primarily from activities associated with the burning of fossil fuels (coal, oil) such as at power plants or from copper smelting In nature, sulfur dioxide can be released to the air, for example, from volcanic eruptions.