Question:medium

Considering the four common air pollutants found in urban environment -- NO, SO\(_2\), Soot and O\(_3\), which one of them is the secondary pollutant?

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Examples: \[ \boxed{ \begin{aligned} \text{Primary Pollutants} &: \mathrm{CO},\ \mathrm{SO_2},\ \mathrm{NO} \text{Secondary Pollutants} &: \mathrm{O_3},\ \mathrm{PAN},\ \mathrm{HNO_3} \end{aligned} } \]
Updated On: Jul 27, 2026
  • NO
  • SO\(_2\)
  • Soot
  • O\(_3\)
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The Correct Option is D

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