Which of the following air pollutants is/are responsible for photochemical smog?
(1) Oxides of nitrogen
(2) Ozone
(3) Unburnt hydrocarbons
(4) Carbon monoxide
1
(1) alone
2
(2), (3) and (4)
3
(1) and (3)
4
(1) and (4)
Which of the following air pollutants is/are responsible for photochemical smog?
(1) Oxides of nitrogen
(2) Ozone
(3) Unburnt hydrocarbons
(4) Carbon monoxide