MSNBC: The cities with the dirtiest air are finally cleaning up their act, the American Lung Association (ALA) reported Wednesday in its annual listing of cleanest and most polluted areas across the country. But the nonprofit that's been on a crusade to ease lung ailments also noted that some 127 million Americans -- more than 40 percent of the population -- still live in areas that it graded with an "F" due to smog or soot levels. "The air has gotten cleaner while the population, the economy, energy...
URL: http://usnews.msnbc.msn.com/_news/2012/04/25/11389455-cities-with-dirtiest-air-see-improvement-american-lung-association-says-in-bestworst-list?lite
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