Q: What happens when the ___ clears over Los Angeles? A: UCLA! (4)

I believe the answer is:

smog

(Other definitions for smog that I've seen before include "Visible air pollution" , "Pollutant fog" , "Fog polluted by smoke" , "Polluted haze" , "Polluted atmosphere" .)

I've seen this clue in The New York Times.

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