"More than 127 million Americans -- about 41 percent of the country -- still suffer from pollution levels that can make breathing dangerous, according to a new report."
"The American Lung Association State of the Air 2012, released Wednesday, shows signs of air-quality improvement, but also indicates struggles in many regions nationwide. The volunteer health organization examined 2008-2010 ozone levels, the main ingredient of smog air pollution, and air-particle pollution at official measuring sites across the U.S.