Which of the following is a secondary polluta | vedclass

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(C) secondary pollutant is not emitted directly into the atmosphere but forms when primary pollutants react in the atmosphere.$PAN$ (Peroxyacetyl nitr

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$PAN$

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(C) secondary pollutant is not emitted directly into the atmosphere but forms when primary pollutants react in the atmosphere.$PAN$ (Peroxyacetyl nitrate) is a classic example of a secondary pollutant formed by the photochemical reaction of nitrogen oxides and volatile organic compounds in the presence of sunlight.$CO$,$CO_2$,and aerosols are generally considered primary pollutants as they are emitted directly from sources.

Which of the following is a secondary pollutant?

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