Los Angeles is back in the top spot as the nation's smoggiest city after being briefly overtaken by Houston a few years back.
I'm not surprised. You can cut the emissions of individual cars by 90%, but that only helps until you end up with ten times as many cars (which you inevitably will because for a while the cleaner air will make LA a more attractive place to live which will draw more people). No emission control measure (in fact, no environmental protection measure of any kind) can be anything but a temporary fix in the face of exponentially increasing populations.
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