Moderate
The classical smog was first observed in the year:
Correct answer: C. 1905
- A. 1885
- B. 1895
- C. 1905
- D. 1910
Explanation
Classical, or London-type, smog was first recognised in London around 1905 and results mainly from coal smoke, sulphur dioxide and fog. The 1940s date is associated with photochemical smog instead.
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