The photochemical smog was first seen in the year:
Correct answer: B. 1943
- A. 1933
- B. 1943
- C. 1953
- D. 1963
Explanation
Photochemical smog was first clearly observed in Los Angeles in 1943, when sunlight acted on nitrogen oxides and hydrocarbons to form ozone and other oxidants. This differs from the coal-smoke-based classical smog of London.
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