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. 2015 Jul 21;12(7):8448–8479. doi: 10.3390/ijerph120708448
1. Boston, MA, 5A 12. Blaine (Minneapolis), MN, 6A
2. New York, NY, 4A 13. Bismarck, ND, 7A
3. Philadelphia, PA, 4A 14. Colstrip, MT, 6B
4. Pittsburgh, PA, 5A 15. Pinedale, WY, 7B
5. Detroit, MI, 5A 16. Denver, CO, 5B
6. Atlanta, GA, 3A 17. Albuquerque, NM, 4B
7. Birmingham, AL, 3A 18. Phoenix, AZ, 2B
8. St. Louis, MO, 4A 19. Riverside, CA, 3B
9. Chicago, IL, 5A 20. Los Angeles, CA, 3B
10. Miami, FL, 1A 21. San Francisco, CA, 3C
11. Houston, TX, 2A 22. Seattle, WA, 4C