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What is sulphur dioxide (SO2)?

Sulphur dioxide (SO2) is a colourless, reactive gas. At higher concentrations it can have a strong odour. It is produced during the combustion of sulphur-containing fuels and industrial operations involving sulphur-containing materials. Major sources of SO2 in BC include the upstream oil and gas industry, metal smelting facilities, pulp / paper mills and marine operations (in the Lower Mainland area). Once released, one possibility is that SO2 can react with other compounds in the air to form fine particulate matter (small solid or liquid particles suspended in air).

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