2. San Francisco, CA, N/A, Good.
3. Boston, MA, 23,40.
4. Oakland, CA, N/A, Good.
5. Eugene, OR, 2.
6. Cambridge, MA, 23,40.
7. Berkeley, CA, N/A, Good.
8. Seattle, WA, 9.
9. Chicago, IL, 21,26.
10. Austin, TX, 32,37.
It appears as the recession has tightened its grip, and more people are unemployed, that the air quality in many cities has become dramatically better.
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