Air Quality Ten Greenest Cities, 11:22pm, 03/21/2009

1. Portland, OR, 31,21.

2. San Francisco, CA, 23,10. 

3. Boston, MA, 19,26.

4. Oakland, CA, 23,10.

5. Eugene, OR, 9.

6. Cambridge, MA, Good, Good. 

7. Berkeley, CA, Good, Good. 

8. Seattle, WA, 22,18.

9. Chicago, IL, 32, 69.

10. Austin, TX, 35,43.