In the America Lung Association State of the Air Report 2010, American cities were ranked according to ozone levels, as well as short-term and year round particle pollution levels. The cities are ranked by the air quality in the most polluted county in the metropolitan area. Here are the ten cities with the highest levels of ozone, number 1 being the worst–with any other rankings they scored for particle pollution.
1o. Charlotte-Gastonia-Salisbury, NC-SC
9. San Luis Obispo-Paso Robles, CA
8. San Diego-Carlsbad-San Marcos, CA
Ranked 17th for short-term particle pollution.
7. Houston-Baytown-Huntsville, TX
Ranked 16th for year round particle pollution.