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Ozone is gaseous " secondary " air pollutant,because:-

$\begin{array}{1 1}(a)\;\text{It is not an important pollutant}\\(b)\;\text{It causes secondary effects on plants & animals}\\(c)\;\text{It is formed by the oxides of nitrogen in sunlight & warm temperature}\\(d)\;\text{It is formed by the oxidation of }O_2\text{ in atmosphere}\end{array} $

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It is formed by the oxidation of $O_2$ in atmosphere
Hence (d) is the correct answer.
answered Mar 27, 2014 by sreemathi.v
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