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Top 10 U.S. Cities Most Polluted by Year-Round Particle Pollution 2008:
1) Los Angeles/Long Beach/Riverside
2) Pittsburgh, Pa.
3) Bakersfield, Calif.
4) Birmingham, Ala.
5) Visalia/Porterville, Calif.
6) Atlanta, Ga.
7) Cincinnati, Ohio
8) Fresno/Madera, Calif.
9) Hanford/Corcoran, Calif.
10) Detroit, Mich.
