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Excess of which of the following in the environment is/are cause(s) of acid rain? 1. Carbon monoxide 2. Nitrogen oxide 3. Ozone 4. Sulphur dioxide

UPSC · 2022 · Environment & Science & Technology
Question:
Excess of which of the following in the environment is/are cause(s) of acid rain? 1. Carbon monoxide 2. Nitrogen oxide 3. Ozone 4. Sulphur dioxide

Options

1, 2 and 3
2 and 4 only
4 only
1, 3 and 4
Answer: 2 and 4 only

Explanation:
Acid rain results primarily from emissions of sulphur dioxide (SO₂) and nitrogen oxides (NOₓ), which react with water vapour to form acids.

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