Consider the following pollutants:

  1. Ground level ozone
  2. Nitrogen dioxide
  3. Smog

  Which of the above is/are secondary pollutant/pollutants?

Answer: [D] 1, 2 & 3

The secondary pollutants are not emitted directly. The secondary pollutants form when the primary pollutants react with themselves or other components of the atmosphere. Most important secondary level Air Pollutants are Ground Level Ozone, Smog and POPs (Persistent Organic Pollutants).

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