How California's war on smog and its ambitious car pollution rules made everyone's air cleaner
Mar 31, 2026
Cars on the road today are 99% cleaner than they were in 1970. Air quality in the United States is much, much better as a result. In Los Angeles, where I live, lead levels in the air were 50 times higher in the 1970s than today, and the amount of lead in kids' blood has plummeted.
https://phys.org/news/2026-03-california-war-smog-ambitious-car.html
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