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Which of the following is primary pollutant?

$\begin{array}{1 1}(a)\;CO\\(b)\;PAN\\(c)\;Aldehydes\\(d)\;H_2SO_4\end{array}$

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CO is a primary pollutant.
Hence (a) is the correct answer.
answered Jan 20, 2014 by sreemathi.v
 
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