1.

Smog is

Answer»

 A combination of smoke and FOG



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.



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