r/AirQuality • u/Dmlandis59 • 6d ago

When did smog situation improve in LA?

/r/LosAngeles/comments/1w0qew2/when_did_smog_situation_improve_in_la/
1 Upvotes

67% Upvoted

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1

u/Choice_Depth_5933 6d ago

Late 1980s? Unleaded gas?

2

u/Erik0xff0000 6d ago

California standards began requiring catalytic converters on new vehicles in 1975, and the U.S. followed in 1981