Question

Correct statement about smog is

• A. NO₂ is present in classical smog
• B. Classical smog also has high concentration of oxidizing agents
• C. Photochemical smog has high concentration of oxidizing agents
• D. Both NO₂ and SO₂ are present in classical smog

Hint:

To differentiate between classical and photochemical smog:
• Classical smog occurs in cool, humid conditions and is reducing in nature.
• Photochemical smog occurs in sunny conditions and contains strong oxidizing agents like ozone.

Answer 1

The Correct Option is C

1. Classical Smog: 
   Also known as "reducing smog."
   It is caused by high concentrations of \(\text{SO}_2\) and particulate matter under cool, humid conditions.
   Classical smog does not contain oxidizing agents like \(\text{NO}_2\).
2. Photochemical Smog:
   Formed in warm, sunny conditions.
   It is caused by the reaction of \(\text{NO}_2\) and volatile organic compounds (VOCs) under sunlight, forming ozone and other oxidizing agents.
   This type of smog has a high concentration of oxidizing agents like \(\text{O}_3\) and peroxyacetyl nitrate (PAN).
Final Answer: (3) Photochemical smog has a high concentration of oxidizing agents.