1. Miami, Florida
2. Seattle, Washington
3. Jacksonville, Florida
4. Orlando, Florida
5. Portland, Oregon
6. San Francisco, California
7. Oklahoma City, Oklahoma
8. Tampa-St. Petersburg, Florida
9. Minneapolis-St. Paul, Minnesota
10. San Jose-Sunnyvale, California
Florida cities are helped by prevailing winds that blow away smog. Link -via Geek Like Me
but San Fransisco!? Parts of that town are nice but other parts are....a toilet!
Keep up the fantastic work.