1 American Lung Association, State of the Air Report 2009 and 2008
2 See the Pennsylvania Air Quality Partnership
3 U.S. E.P.A. Web site, "Six Common Air Pollutants"
4 U.S. E.P.A. Area Designations for 2006 24-Hour Fine Particle (PM2.5) Standards
5 U.S. E.P.A. Designation Recommendations For the 2008 Eight-Hour Ozone National Ambient Air Quality Standard
6 U.S. E.P.A. Web site, "Process of Reviewing Standards"
7 American Lung Association, "Health Risks (Particle Pollution)"
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