Top 10 most-polluted cities in US

A report published by American Lung Association ranks the cities by the air quality in the most polluted county in the metropolitan area.  The report ranks the cities using three indicators such ozone, year round particle pollution and short time particle pollution.

Bad air quality are linked with some lung diseases, and the worst part is that more than half of Americans are living under bad air quality. The association has suggested tips on improving air quality.

Below cities are ranked based on  year-round particle pollution:

#1: Phoenix-Mesa-Scottsdale, AZ
#2: Bakersfield, CA
#3: Los Angeles-Long Beach-Riverside, CA
#3: Visalia-Porterville, CA
#5: Pittsburgh-New Castle, PA
#6: Fresno-Madera, CA
#7: Birmingham-Hoover-Cullman, AL
#8: Hanford-Corcoran, CA
#9: Cincinnati-Middletown-Wilmington, OH-KY-IN
#9: St. Louis-St. Charles-Farmington, MO-IL