Air Quality In The 10 Greenest Cities, 3:30pm, 03/10/2009

1. Portland, OR, 22, 21, Good. 

2. San Francisco, CA, 18, 19, Good. 

3. Boston, MA, 26, 47. 

4. Oakland, CA, 18, 19, Good. 

5. Eugene, OR, 8, Very Good. 

6. Cambridge, MA, Good, Good (Wunderground)

7. Berkeley, CA, Good, Good. 

8. Seattle, WA, 9, 32, Good.

9. Chicago, IL, 13, 79.

10. Austin, TX, 22, 38, Good.