Smog is ______________________?
Correct answer: B. A combination of smoke and fog
- A. Nothing but black smoke
- B. A combination of smoke and fog
- C. A liquid particle resulting from vapor condensation
- D. A solid particle e.g. fly-ash
Explanation
The word smog combines smoke and fog, describing polluted air containing fine particles and droplets. It is not restricted to black smoke alone.
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