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Which of the following is not a air pollutant?

$\begin{array}{1 1}(a)\;N_2\\(b)\;N_2O\\(c)\;NO\\(d)\;CO\end{array}$

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$N_2$ is not a air pollutant.
Hence (a) is the correct answer.
answered Jan 21, 2014 by sreemathi.v
 
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