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Question

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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