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Sulfur dioxide (also sulphur dioxide) is the chemical compound with the formula SO2. [1] It is a colourless gas with a pungent, irritating and rotten odour. [2] Sulfur dioxide is non-flammable and reacts easily with other substances to form harmful compounds, such as sulfuric acid, sulfurous acid and sulfate particles.
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, it can be released to the air, for example, from volcanic eruptions. [1,2]
