Unfortunately, I have not been able to find evidence suggesting that smog levels have dropped in any U.S. cities. The good news is that the smoggiest cities in the U.S., Los Angeles and Denver, are taking steps towards doing just that. In Denver, Colorado, the second most polluted U.S. city, the local government has requested that people not drive to work at least one day a week, encouraged use of oxygenated fuels, and experimented with fuels that create less smog. Not to be outdone, Los Angeles’ city council came up with a long list of measures aimed at reducing smog. They decided to require carpooling, offer free bus services, and create many environmentally-friendly regulations for homes.
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