Which of the following is secondary pollutant?

C O_{2}

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N_{2} O

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P A N

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S O_{2}

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Solution

The correct option is C $P A N$
Secondary pollutants are pollutants which are formed in the atmosphere. These pollutants are not emitted directly from a source.
(a) Natural sources of $C O_{2}$ include decomposition, ocean release and respiration. Human sources come from activities like deforestation as well as the burning of fossil fuels like coal, oil and natural gas etc.
(b) Source of $N_{2} O$ : Nitrous oxide is emitted during agricultural and industrial activities, combustion of fossil fuels and solid waste, as well as during treatment of wastewater.
(c) Peroxyacyl nitrates $(P A N s)$ is formed during the photochemical reactions of hydrocarbons in the atmosphrere. As it is formed in the atmosphere, it is a secondary pollutant. It is one of the most potent eye irritant found in photochemical smog.
(d) Source of $S O_{2}$ : The main sources of $S O_{2}$ emissions are from fossil fuel combustion at power plants, refineries, and other industrial facilities.

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