Cities With Dirtiest Air, Short-Term Particle Pollution
1. Pittsburgh–New Castle, Pa.
2. Los Angeles–Long Beach–Riverside, Calif.
3. Fresno–Madera, Calif.
4. Bakersfield, Calif.
5. Birmingham–Hoover–Cullman, Ala.
Cities With Dirtiest Air, Year-Round Particle Pollution
1. Los Angeles–Long Beach–Riverside, Calif.
2. Pittsburgh–New Castle, Pa.
3. Bakersfield, Calif.
4. Birmingham–Hoover–Cullman, Ala.
5. Visalia–Porterville, Calif.
Cities With Cleanest Air, Short-Term Particle Pollution
1. Alexandria, La.
2. Amarillo, Texas
3. Bismarck, N.D.
4. Brownsville–Harlingen–Raymondville, Texas
5. Cheyenne, Wyo.
Cities With Cleanest Air, Year-Round Particle Pollution
1. Cheyenne, Wyo.
2. Santa Fe–Espanola, N.M.
3. Honolulu
4. Great Falls, Mont.
5. Farmington, N.M.
Source: American Lung Association, “State of the Air: 2008”