Question
Photochemical smog is formed from automobile exhaust ________________?
Options:
A .  By reaction of hydrocarbon & nitric oxide in presence of sunlight
B .  Appears only on sunny days
C .  Is harmful for crops and trees also besides causing eye irritation & asthma
D .  All A., B. & C.
Answer: Option D
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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