Question:
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?
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 23, 2026
- NO
- SO\(_2\)
- Soot
- O\(_3\)
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Recall the types of air pollutants.
Primary pollutants are emitted directly into the atmosphere.
Secondary pollutants are formed by chemical reactions among primary pollutants.
Step 2: Identify the secondary pollutant. Ground-level ozone is formed by photochemical reactions involving nitrogen oxides and volatile organic compounds. Hence, \[ \boxed{\mathrm{O_3}} \] is a secondary pollutant. Therefore, \[ \boxed{(D)} \] is the correct answer.
Step 2: Identify the secondary pollutant. Ground-level ozone is formed by photochemical reactions involving nitrogen oxides and volatile organic compounds. Hence, \[ \boxed{\mathrm{O_3}} \] is a secondary pollutant. Therefore, \[ \boxed{(D)} \] is the correct answer.
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