Moderate

The classical smog was first observed to:

Correct answer: B. London

  • A. Paris
  • B. London
  • C. Tokyo
  • D. New York

Explanation

Classical, or London-type, smog was characteristically observed in London under cool, humid conditions, with coal smoke and sulphur compounds trapped near the ground. Tokyo and Los Angeles are more commonly linked with photochemical smog discussions.

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