thx! TIL leaded gasoline was phased out in the 1970s primarily because it clogged catalytic converters needed to end smog, not because of health reasons!
(smog used to be terrible - I lived through the latter half of that period, am I can't even relate to how awful it used to be... friends and I remember walking in midtown Manhattan, blowing our noses and it being black... I can't even imagine pre-1980 let alone pre-1970... https://timeline.com/la-smog-pollution-4ca4bc0cc95d )
(smog used to be terrible - I lived through the latter half of that period, am I can't even relate to how awful it used to be... friends and I remember walking in midtown Manhattan, blowing our noses and it being black... I can't even imagine pre-1980 let alone pre-1970... https://timeline.com/la-smog-pollution-4ca4bc0cc95d )