Which of the following is a secondary air pollutant?

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Ozone

Carbon dioxide

Carbon monoxide

Sulphur dioxide

answer is A.

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Detailed Solution

●        Ozone is a secondary air pollutant i.e. the pollutant does not have any direct source to emit while primary pollutants have a direct source to emit.
●        Ozone is formed by the combination of hydrocarbons (produced by combustion of fuel) and nitrogen oxide (produced by smoke and gases from industries & automobiles).

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