State of the Air 2011

In its 12th annual State of the Air report, the American Lung Association found that the nation continues to be impacted by air pollution.  Roughly 50% the people in the US live in counties that have unhealthful levels of either ozone or particle pollution.

The association analyzed federal data collected between 2007 and 2009 on short-term and annual average concentrations of ozone, or smog - usually generated by car exhaust mixed with heat - and fine particle emissions from diesel trucks, coal-fired power plants and wood-burning fireplaces.

Visit the State of the Air website to review the key findings and see how your county scored. The scoring and ranking methodology is explained here.