Nitrous oxide is:

  1. also known as laughing gas
  2. colorless & non-flammable gas
  3. one of the pollutants to measure National Air Quality Index
  4. one of the greenhouse gases covered in Kyoto Protocol

Select the correct option from codes given below:

Answer: [C] 1, 2 & 4

Nitrogen dioxide is one of the pollutants to measure the National Air Quality Index.

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