Air Quality Ten Greenest Cities, 9:43am, 03/14/2009

1. Portland, OR, 30,30, Good. 

2. San Francisco, CA, Good for Ozone, N/A. 

3. Boston, MA, 9, 40. Today's: Moderate Risk. 

4. Oakland, CA, Good for Ozone. 

5. Eugene, OR, 17 Good. 

6. Cambridge, MA, Moderate Particulate Matter.

7. Berkeley, CA, Good. 

8. Seattle, WA, 23, 16.

9. Chicago, IL, 6,69. 

10. Austin, TX, 15,7.