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Q.

Which of the following air pollutants are responsible for photochemical smog ?

(a) Oxides of nitrogen (b) Ozone
(c) Unburnt hydrocarbons (d) Sulphur dioxide

[A] (a), (b) and (d) only

[B] (a), (b) and (c) only

[C] (c) and (d) only

[D] (a) and (c) only

Answer & Explanation
Answer: (a), (b) and (c) only

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