Air Quality 10 Greenest Cities, 11:20pm, 03/08/2009

1. Portland, OR, 26, 12. 

2. San Francisco, CA, 26, 28. 

3. Boston, MA, 28, 39, tomorrow: Moderate. 

4. Oakland, CA, 26, 28.

5. Eugene, OR, 6.

6. Cambridge, MA, Good (Wunderground)

7. Berkeley, CA, Good (Wunderground)

8. Seattle, WA, 25, 12. 

9. Chicago, IL, 25, 50. 

10. Austin, TX, 18, 54.

http://www.popsci.com/environment/article/2008-02/americas-50-greenest-cities?page=1