Which one of the following contains secondary pollutants?

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Automobile exhaust

Chimney smoke

Photochemical smog

Classical smog

answer is C.

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Detailed Solution

Concept: It is created when atmospheric nitrogen oxides interact with UV radiation from the sun. The morning and afternoon are when it is most evident as a brown haze, especially in warm, densely populated cities.
Light-based energy absorption triggers the photochemical process. Smoke and smog together create the word "smog." The main cause of air pollution, photochemical smog, is made up of both primary and secondary pollutants. The majority of molecules with double or triple covalent bonds between neighbouring carbon atoms are nitrogen oxides and volatile organic compounds such as unsaturated hydrocarbons. ethylene, as an illustration.
Hence, the correct answer is option 3.

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