50. 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: 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.
