Question

Smog is essentially caused by the presence of

• A. $O_2$ and $O_3$
• B. $O_2$ and $N_2$
• C. Oxides of sulphur and nitrogen
• D. $O_3$ and $N_2$

Answer 1

The correct option is C Oxides of sulphur and nitrogen

Smog a kind of air pollution, originally named for the mixture of smoke and fog in the air. Smog is mainly caused by oxides of sulphur and nitrogen $S{O}_2,N_{2}O,NO$ etc.