Photochemical smog pollution does not contain-
- Nitrogen dioxide
- PAN (peroxy acyl nitrate)
- Ozone
- Carbon dioxide
Answer
(4) Carbon dioxide
Solution
Photochemical smog is formed when sunlight acts on nitrogen oxides and hydrocarbons released from automobiles.
⇒ Its main components are NO2, ozone (O3), PAN (peroxyacetyl nitrate), acrolein and formaldehyde — all oxidising agents.
∴ Carbon dioxide is not a component of photochemical smog.
Answer: (4)