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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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