by Jess Zimmerman. California may have the nation's first cap-and-trade program, but it also has seven of the 10 most polluted cities, according to Forbes . Here are the rest of the 20 dirtiest metropolitan areas : 20. Cleveland, Ohio 19. Indianapolis, Ind. 18. Houston, Texas 17. Salt Lake City, Utah 16. Washington, D.C. 15. Knoxville, Tenn. 14. New York, N.Y. 13. Cincinnatti, Ohio 12. Philadelphia, Pa. 11. Louisville, Ky. 10. Sacramento, Calif. 9. San Diego, Calif. 8. Phoenix, Ariz. 7. Birmingham, Ala.

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