Ncert Exercises & Solutions

Photochemical smog occurs in warm, dry, and sunny climates. One of the following is not amongst the components of photochemical smog. Identify it:

1. NO₂

2. O₃

3. SO₂

4. Unsaturated hydrocarbon

The smog which is formed in presence of sunlight is called photochemical smog. This occurs in the months of summer when NO₂ and hydrocarbons are present in large amounts in atmosphere.

Concentration of O₃, PAN, aldehydes and ketones builds up in the atmosphere.

SO₂ is not responsible for photochemical smog.

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