Carbon monoxide does not play any role in photochemical smog formation
Photochemical smog is an oxidising agent in character
Photochemical smog is formed through photochemical reaction involving solar energy
Photochemical smog does not cause irritation in eyes and throat
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Solution and Explanation
Photochemical smog is formed in warm and sunny climate during day time by the action of sunlight on primary pollutants. It contains nitrogen oxides, ozone, PAN, etc., which are oxidising in nature. So, photochemical smog is an oxidising agent in character. It causes irritation in eyes and throat.