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Which of the following gaseous air pollutants can lead to the formation of photochemical smog?

Option: 1

Carbon dioxide

Option: 2

Sulphur dioxide

Option: 3

Nitrogen dioxide

Option: 4

Carbon monoxide

Answers (1)


Nitrogen dioxide is a primary pollutant produced by vehicle exhausts and high-temperature combustion processes. It reacts with volatile organic compounds (VOCs) in the presence of sunlight to form ground-level ozone and other photochemical oxidants that cause photochemical smog. Carbon dioxide, on the other hand, is a greenhouse gas that contributes to global warming but does not directly lead to the formation of smog. Sulfur dioxide and Carbon monoxide can cause respiratory problems but do not contribute to smog formation.

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