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UPSC Civil Service Exam Questions - Engineering

Q1:

Which of the following air pollutants is/are responsible for photochemical smog ?
1. Oxides of nitrogen
2. Ozone
3. Unburnt hydrocarbons
4. Carbon monoxide
Select the correct answer from the codes given below :

A 1 alone

B 2, 3 and 4

C 1, 3 and 4

D 1 and 3

ANS:D - 1 and 3

No answer description is available.