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# Identify the secondary pollutant among the following

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

• 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.