What is the problem with N and S compounds in fuel ?

What is the problem with N and S compounds in fuel ?
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Answer :

The substances we use as fuel release CO 2 and water vapor into the air. The amount of CO 2 in the air does not change much as the plant absorbs CO 2. However, when S and N compounds are mixed in the fuel, combustion releases CO 2 in the air as a by-product of SO₂, SO 3 and NO 2 . These by-products cause acid rain which is a threat to the environment
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