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GK MCQs Section
Q. Smog is a combination of__:
Answer: smoke and fog
Notes: 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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Question Number: 379 in World Geography - Continents and Country Trivia in above course in App.