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How is SO2 an air pollutant?...

How is `SO_2` an air pollutant?

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i) S02 dissolves in moisture present in air to form H2S03 which damages building materials especially marble. `CaCO_(3) + H_(2)SO_(4) rarr Ca.SO_(3) + H_(2)O + SO_(2)`
ii) It causes throat and eye irritation, resulting in cough, tears and redness in. eyes.
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