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Which one of the following statements regarding photochemical smog is not correct?

1. Carbon monoxide does not play any role in photochemical smog formation.
2. Photochemical smog is an oxidising agent in character.
3. Photochemical smog is formed through photochemical reaction involving solar energy.
4. Photochemical smog does not cause irritation in eyes and throat.

Correct answer: Photochemical smog does not cause irritation in eyes and throat.

Solution

Photochemical smog causes irritation in the eyes and throat due to the presence of harmful oxidants like ozone and peroxyacetyl nitrate (PAN). Thus, statement D is incorrect.

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