Cities with Less Smog See More Green

Thanks to the Clean Air Act, many metro areas have tackled poor air quality, saving thousands of lives and millions of dollars in the process

As sunburn victims and Al Gore fans well know, we're short on stratospheric ozone these days. But ozone created near the ground—the primary component of urban smog—is one of the country's most widespread and most damaging air pollutants, and few are complaining about its gradual depletion.

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