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How California’s war on smog and its ambitious car pollution rules made everyone’s air cleaner

  • Written by Ann E. Carlson, Professor of Environmental Law, University of California, Los Angeles
How California’s war on smog and its ambitious car pollution rules made everyone’s air cleanerBefore catalytic converters, starting a gas-powered vehicle could choke the surrounding area with smog.Bettmann via Getty Images

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...

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