Question

The smog is essentially caused by the presence of
(a) Oxides of sulphur and nitrogen
(b) O₂ and N₂
(c) O₂ and O₃
(d) O₃ and N₂

Answer 1

A is the answer . Oxides of sulphur and nitrogen

Answer 2

there is your answer

(a)oxides of sulphur and nitrogen✓