Q. Which of the following is not an air pollutant?
A) $N_{2}$
B) $N_{2}O$
C) $NO$
D) $CO$
Explanation
(a)
Nitrogen gas is present in air up to 78% by volume. It does not cause pollution.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.