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Smog is mainly due to the presence of which pair of gases?

1. Oxides of sulphur and nitrogen
2. Oxygen and nitrogen
3. Oxygen and ozone
4. Ozone and nitrogen

Correct answer: Oxides of sulphur and nitrogen

Solution

Smog is caused by oxides of sulphur (classical) and nitrogen (photochemical), not by the oxygen and nitrogen of normal air.

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