(WASHINGTON) -- There are some lists that cities would rather not be highly ranked on, and the list of most polluted cities is one of those lists.
The American Lung Association recently released its annual report on air quality across America, titled the State of the Air 2011. Those who compiled the report say it assigns grades for ozone air pollution (smog) and particle air pollution (soot) and then ranks the cities according to these criteria. Overall, researchers say the 2011 report found that some progress has been made in the cleanup of deadly toxics.
The five most polluted cities by ozone pollution, according to the State of the Air 2011 report are as follows:
1. Los Angeles-Long Beach-Riverside, Calif.
2. Bakersfield-Delano, Calif.
3. Visalia-Porterville, Calif.
4. Fresno-Madera, Calif.
5. Sacramento--Arden-Arcade--Yuba City, Calif.
The five most polluted cities by short-term particle pollution, according to the State of the Air 2011 report are as follows:
1. Bakersfield-Delano, Calif.
2. Fresno-Madera, Calif.
3. Pittsburgh-New Castle, Pa.
4. Los Angeles-Long Beach-Riverside, Calif.
5. Salt Lake City-Ogden-Clearfield, Utah
Copyright 2011 ABC News Radio