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Which of the following is not a primary pollutant

$\begin{array}{1 1}(a)\;SO_2\\(b)\;NO_2\\(c)\;PaN,O_3\\(d)\;CO_2\end{array}$

1 Answer

Peroxyacetyl nitrate (PAN) and ozone are the two important secondary photochemical air pollutants found in the urban atmosphere
Hence (c) is the correct answer.
answered Jan 21, 2014 by sreemathi.v
edited Feb 26 by sharmaaparna1