207. “Smog” is a mixture of

A. Smoke and Fog
B. Snow and Fog
C. Snow and Dust
D. Sulphur Dioxide and Fog
✅ The correct answer is option A.
Smog is a kind of air pollution, originally named for the mixture of smoke and fog in the air. Classic smog results from large amounts of coal burning in an area and is caused by a mixture of smoke and sulfur dioxide.

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