11. Boston, MA (score 6.99, pop. 589,141)

- Green building

- Excellent public transport

- Smoking ban

12. Lexington, KY (score 6.785, pop. 260,512)

- Comprehensive growth management plan

- Clean air

- Smoking ban

13. Springfield, IL (score 6.7225, pop. 111,454)

- Clean air and good water

- Green design

- Green spaces

14. Irvine, CA (score 6.72, pop. 143,072)

- Comprehensive green building program

- Smoking ban

- Pedestrian oriented

15. Cambridge, MA (score 6.72, pop. 101,355)

- High rate of public transport use

- Green design

- High percentage of green space

16. Anchorage, AK (score 6.705, pop. 260,283)

- Excellent air and water quality

- Smoking ban

- High public health

17. Syracuse, NY (score 6.66, pop. 147,306)

- Good air

- Smoking ban

- Commitment to reduce greenhouse gases

18. San Francisco, CA (score 6.6, pop. 776,733)

- Municipal composting

- Green design

- High percentage of renewable energy use

- Very high public transport use

19. Minneapolis, MN (score 6.58, pop. 382,618)

- City-specific minimum wage

- Smoking ban

- High percentage of renewable biomass energy

20. Milwaukee, WI (score 6.5125, pop. 596,974)

- Green housing development

- Green space

21. Rochester, NY (score 6.43, pop. 219,773)

- High percentage of renewable energy

- Clean air

- Smoking ban

22. Albuquerque, NM (score 6.3475, pop. 484,607)

- Clean water

- Smoking Ban

- Wind power

23. Ann Arbor, MI (score 6.2875, pop. 114,024)

- High percentage of public transport and bicycle commuters

- High yard waste recover

- Green space

24. Seattle, WA (score 6.115, pop. 563,374)

- Large number of green buildings

- Very high percentage of hydroelectric power use

- Clean air and smoking ban

25. Kansas City, MO (score 6.055, pop. 441,545)

- Clean water

- City specific minimum wage

- U.S. Mayors Climate Protection signatory