Q. Which of the following is a secondary pollutant ?
A) $SO_2$
B) $CO_2$
C) CO
D) $O_3$
Explanation
[Solution] Tropospheric ozone forms from reactions of primary pollutants (NOx, hydrocarbons) in sunlight. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.