Ten Most Polluted Cities

Source:

1. Fresno-Madera, Calif.
2. Bakersfield, Calif.
3. Visalia-Porterville-Hanford, Calif.
4. Modesto-Merced, Calif.
5. Los Angeles-Long Beach, Calif.
6. San Jose-San Francisco-Oakland, Calif.
7. Salt Lake City-Provo-Orem, Utah
8. Logan, Utah-Idaho Metropolitan Statistical Area
9. Fairbanks, Alaska
10. Pittsburgh-New Castle-Weirton, Pa.-Ohio-W.Va.