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# Which of the following is not a primary pollutant

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

Can you answer this question?

$PaN,O_3$
Hence (c) is the correct answer.
answered Jan 21, 2014