Q. Which one of the following groups represents secondary air pollutants?
- Ozone, Formaldehyde, Peroxy-acetyl-nitrate, and Halogen compounds
- Formaldehyde, Hydrocarbon, Ozone and Photochemical smog
- Ozone, Acid mist, Formaldehyde and Photochemical smog
- Formaldehyde, Acid mists, Hydrocarbon and Photochemical smog
Answer: Ozone, Acid mist, Formaldehyde and Photochemical smog
