In the form of important air pollutants, the Oxides of Nitrogen are directly or indirectly responsible for __:
1. Acid rain
2. Ground Level Ozone
3. Smog
4. Ozone depletion
Select the correct option from the codes given below:

Answer: [D] 1, 2, 3 & 4

This question is a part of GKToday's Integrated IAS General Studies Module