Top Ten Dirties Cities

1. Pittsburgh, Pennsylvania
2. Los Angeles/Long Beach/Riverside, California
3. Fresno/Madera, California
4. Bakersfield, California
5. Birmingham, Alabama
6. Logan, Utah
7. Salt Lake City, Utah
8. Sacramento, California
9. Detroit, Michigan
10. Baltimore, Maryland and Washington, D.C.

Top 10 Most Green Cities

1. Portland, Oregon
2. San Francisco, California
3. Boston, Massachusetts
4. Oakland, California
5. Eugene, Oregon
6. Cambridge, Massachusetts
7. Berkeley, California
8. Seattle, Washington
9. Chicago, Illinois
10. Austin, Texas