Which of the following is called secondary air pollutant?

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Bihar STET TGT (Sanskrit) Official Paper-I (Held On 11 Sept, 2023 Shift 1)
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  1. pan
  2. ozone
  3. carbon monoxide
  4. Both 1 and 2 

Answer (Detailed Solution Below)

Option 4 : Both 1 and 2 
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Detailed Solution

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The correct answer is Both 1 and 2.

Key Points

  • Primary vs. Secondary Air Pollutants
    • Primary Air Pollutants are emitted directly from a source.
    • Examples:- Carbon Monoxide (CO), Sulfur dioxide (SO2), and Nitrogen oxides (NOx).
    • Secondary Air Pollutants are not emitted directly but form in the atmosphere when primary pollutants react or interact.
    • Examples:- Ozone (O3), peroxyacetyl nitrate (PAN), and certain particulates.

Additional InformationSecondary Air Pollutants:

  • Peroxyacetyl Nitrate (PAN):
    • PAN is a component of photochemical smog.
    • It forms in the atmosphere through the reaction of volatile organic compounds (VOCs) and nitrogen oxides (NOx) in the presence of sunlight.
  • Ozone (O3):
    • Ozone at ground level (tropospheric ozone) is a major component of smog.
    • It forms when nitrogen oxides (NOx) react with VOCs in the presence of sunlight.
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