Top 10 - America's Most Ozone Polluted Metro Areas (2006)
1. Bakersfield, California 2. Los Angeles, California 3. Visalia-Porterville, California 4. Fresno-Madera, California 5. Merced, California 6. Houston, Texas 7. Sacramento, California 8. Dallas (Fort Worth), Texas 9. New York (Newark), New York 10. Philadelphia, Pennsylvania
