Q.

Smog is a combination of –

A. air and water vapour
B. water and smoke
C. fire and water
D. smoke and fog
Answer» D. smoke and fog
Explanation: The term "smog' was first used in London during the early 1900's to describe the combination of smoke and fog. What we typically call "smog" today is a mixture of pollutants but is primarily made up of ground- level ozone.
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