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You can be exposed to SO2 by breathing it in the air or getting it on your skin.  People who live near industrial sources of sulphur dioxide may be exposed to it in the air.  You are most likely to be exposed if you work in industries where SO2 is produced, such as copper smelting or power plants, or where SO2 is used like the production of sulphuric acid, paper, food preservatives or fertilizers.  People with malfunctioning appliances or chimneys in their homes may also be exposed to sulphur dioxide.