Every year, the American Lung Association uses air-quality-index data from the EPA to rank the air in U.S. cities from most to least hazardous.

Bad Air

Highest in ozone (ranked in descending order):
Bakersfield, California
Los Angeles
Visalia, California
Fresno, California
Merced, California
Houston
Sacramento, California
Dallas–Fort Worth
New York City
Philadelphia

Highest in particulate matter (ranked in descending order):
Los Angeles
Bakersfield, California
Pittsburgh
Visalia, California
Fresno, California
Detroit
Hanford, California
Cleveland
Birmingham, Alabama
Atlanta

Good Air

Lowest in ozone*:
Colorado Springs
Daytona Beach, Florida
Des Moines
Honolulu
Lakeland, Florida
Palm Bay, Florida
Port St. Lucie, Florida
Salem, Oregon
Salinas, California
Spokane

Lowest in particulate matter (ranked in descending order):
Cheyenne, Wyoming
Santa Fe, New Mexico
Honolulu
Great Falls, Montana
Tucson
Anchorage
Farmington, New Mexico
Bismarck, North Dakota
Albuquerque, New Mexico
Rapid City, South Dakota

*A sampling of the most populous cities on the EPA’s list, unranked.