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chemistry

Photochemical smog was first observed in:

A

London

B

Los Angeles

C

Paris

D

Tokyo

Answer

Photochemical smog was first observed in Los Angeles in the 1940s. 

A photochemical smog is the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere, which leaves airborne particles (called particulate matter) and ground-level ozone. 

Option B is correct.

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