Question:
Which of the following is a secondary pollutant ?
Which of the following is a secondary pollutant ?
Updated On: Apr 24, 2026
- CO
- SO2
- CO2
- O3
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
To determine which option is a secondary pollutant, we need to understand the difference between primary and secondary pollutants:
- Primary Pollutants: These are pollutants that are directly emitted into the atmosphere from sources. Examples include carbon monoxide (CO), sulfur dioxide (SO2), and carbon dioxide (CO2).
- Secondary Pollutants: These are not emitted directly. Instead, they form in the atmosphere through chemical reactions between primary pollutants and other components in the atmosphere. Ozone (O3) is a typical example of a secondary pollutant that forms when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight.
Given the options:
- CO (Carbon Monoxide): A primary pollutant emitted from vehicle exhaust, industrial processes, etc.
- SO2 (Sulfur Dioxide): A primary pollutant that comes from fossil fuel combustion at power plants and other industrial settings.
- CO2 (Carbon Dioxide): A primary pollutant released from burning fossil fuels, among other sources.
- O3 (Ozone): A secondary pollutant formed by the reaction of sunlight with primary pollutants like NOx and VOCs.
Therefore, the correct answer is:
O3 (Ozone) - It is a secondary pollutant.
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