Correct statement about smog is

Step-by-step solution

A. Classical smog occurs in cool humid climate. It is a mixture of smoke, fog, and sulphur dioxide. Chemically it is a reducing mixture and so it is called reducing smog. So statement A is incorrect. B. Classical smog is a mixture of smoke, fog and SO 2 . NO 2 is not present in classical smog. So, statement B is incorrect. C. Photochemical smog occurs in warm, dry and sunny climate. The main components of the photochemical smog result from the action of sunlight on unsaturated hydrocarbons and nitrogen oxides produ