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| Q. |
Smog is a combination of – |
| A. | Air and water vapours |
| B. | Water and smoke |
| C. | Fire and water |
| D. | Smoke and fog |
| Answer» D. Smoke and fog | |
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Explanation: Smog is a type of air pollution; the word "smog" was coined in the early 20th century as a portmanteau of the words smoke and fog to refer to smoky fog. The word was then intended to refer to what was sometimes known as pea soup fog, a familiar and serious problem in London from the 19th century to the mid 20th century. This kind of smog is caused by the burning of large amounts of coal within a city; this smog contains soot particulates from smoke, sulfur dioxide and other components. |
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