Question:
Which of the following is not involved in the formation of photochemical smog?
Which of the following is not involved in the formation of photochemical smog?
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Photochemical smog = NOₓ + hydrocarbons + sunlight → O₃
Updated On: Mar 19, 2026
- Hydrocarbon
- NO
- SO₂
- O₃
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The Correct Option is C
Solution and Explanation
Step 1: Photochemical smog is formed due to reactions between:
\beginitemize
• Nitrogen oxides (NO, NO₂)
• Hydrocarbons
• Sunlight
\enditemize
Step 2: Ozone (O₃) is a major constituent formed during photochemical smog.
Step 3: Sulphur dioxide (SO₂) is mainly responsible for classical (London) smog, not photochemical smog.
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