Question:
The pollutants which come directly in the air from sources are called primary
pollutants. Primary pollutants are sometimes converted into secondary
pollutants. Which of the following belongs to secondary air pollutants?
(i) CO
(ii) Hydrocarbon
(iii) Peroxyacetyl nitrate
(iv) NO
Solution:
Option (iii) Peroxyacetyl nitrate is the answer.