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Identify the secondary pollutant among the following

$\begin{array}{1 1}(a)\;CH_4&(b)\;\text{Peroxy acetyl nitrate}\\(c)\;SO_2&(d)\;NO\end{array}$

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  • A primary pollutant is an air pollutant emitted directly from a source.
  • A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
  • Examples of a secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides ($NO_x$) combine in the presence of sunlight; $NO_2$, which is formed as NO combines with oxygen in the air; and acid rain, which is formed when sulfur dioxide or nitrogen oxides react with water.
Peroxy acetyl nitrate.
Hence (b) is the correct option.
answered Jan 20, 2014 by sreemathi.v
edited Apr 2, 2014 by mosymeow_1
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