NBCNews.com4 in 10 Americans breathing unhealthy, polluted air. Are you?NBCNews.comHere's something to consider before you go for a run on a smoggy day or buy a house near a busy highway. Air pollution remains a "pervasive public health threat" in the U.S., with almost half of Americans — about 44 percent — living in communities where ...Pittsburgh's air continues to improve, American Lung Assn. saysPittsburgh Post-GazetteAir pollution worsens in Harrisburg-York-Lebanon metro area; report saysPennLive.comSaratoga amoung counties with cleanest airTroy RecordWKSU News -Charleston Daily Mail -Buffalo Newsall 39 news articles »
4 in 10 Americans breathing unhealthy, polluted air. Are you?
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