U.S. cities with the worst air pollution
by year-round particle pollution, 2012
Worst air pollution
1. Bakersfield-Delano, Calif.
2. Hanford-Corcoran, Calif.
3. Los Angeles-Long Beach-Riverside, Calif.
4. Visalia-Porterville, Calif.
5. Fresno-Madera, Calif.
6. Pittsburgh-New Castle, Pa.
7. Phoenix-Mesa-Glendale, Ariz.
8. Cincinnati-Middletown-Wilmington, Ohio-Ky.-Ind.
9. Louisville-Jefferson County-Elizabethtown-Scottsburg, Ky.-Ind.
10. (tie) Philadelphia-Camden-Vineland, Pa.-N.J.-Del.-Md.
St. Louis-St. Charles-Farmington, Mo.-Ill.
Source: American Lung Association 2012 State of the Air report.
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