The smog is essentially caused by the presence of
A
O<sub>3</sub> and N<sub>2</sub>
B
O<sub>2</sub> and N<sub>2</sub>
C
Oxides of N and S
D
O<sub>2</sub> and O<sub>3</sub>
Correct Answer: Oxides of N and S
Photochemical smog is caused by oxides of sulphur and nitrogen.