Smog is

A. Nothing but black smoke

B. A combination of smoke and fog

C. A liquid particle resulting from vapour condensation

D. A solid particle, e.g., fllyash

Answer: Option B

Solution(By Examveda Team)

Smog is air pollution that reduces visibility. The term "smog" was first used in the early 1900s to describe a mix of smoke and fog. The smoke usually came from burning coal. Smog was common in industrial areas, and remains a familiar sight in cities today. Today, most of the smog we see is photochemical smog.