Q. Which of the following is secondary pollutant?
A) $NO$
B) $NO_{2}$
C) $SO_{2}$
D) PAN
Explanation
PAN (Peroxyacetyl nitrate) is a secondary pollutant.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.