Most Polluted Cities
Click on a city below to learn more about its ranking
By Ozone
- Los Angeles-Long Beach-Riverside, CA
- Visalia-Porterville, CA
- Bakersfield-Delano, CA
- Fresno-Madera, CA
- Hanford-Corcoran, CA
- Sacramento--Arden-Arcade--Yuba City, CA-NV
- Houston-Baytown-Huntsville, TX
- Dallas-Fort Worth, TX
- Washington-Baltimore-Northern Virginia, DC-MD-VA-WV
- El Centro, CA
- Merced, CA
- San Diego-Carlsbad-San Marcos, CA
- Modesto, CA
- Birmingham-Hoover-Cullman, AL
- Cincinnati-Middletown-Wilmington, OH-KY-IN
- Las Vegas-Paradise-Pahrump, NV
- Louisville-Jefferson County-Elizabethtown-Scottsburg, KY-IN
- New York-Newark-Bridgeport, NY-NJ-CT-PA
- Charlotte-Gastonia-Salisbury, NC-SC
- Beaumont-Port Arthur, TX
- Oklahoma City-Shawnee, OK
- Philadelphia-Camden-Vineland, PA-NJ-DE-MD
- Phoenix-Mesa-Glendale, AZ
- Pittsburgh-New Castle, PA
- San Luis Obispo-Paso Robles, CA
By Year Round Particle Pollution
- Bakersfield-Delano, CA
- Fresno-Madera, CA
- Hanford-Corcoran, CA
- Los Angeles-Long Beach-Riverside, CA
- Modesto, CA
- Salt Lake City-Ogden-Clearfield, UT
- Pittsburgh-New Castle, PA
- Merced, CA
- Fairbanks, AK
- Logan, UT-ID
- Provo-Orem, UT
- Stockton, CA
- Las Cruces, NM
- Eugene-Springfield, OR
- Visalia-Porterville, CA
- Chicago-Naperville-Michigan City, IL-IN-WI
- Seattle-Tacoma-Olympia, WA
- Green Bay, WI
- Harrisburg-Carlisle-Lebanon, PA
- Indianapolis-Anderson-Columbus, IN
- Phoenix-Mesa-Glendale, AZ
- Allentown-Bethlehem-Easton, PA-NJ
- San Diego-Carlsbad-San Marcos, CA
- Portland-Vancouver-Hillsboro, OR-WA
- South Bend-Elkhart-Mishawaka, IN-MI
By Short-Term Particle Pollution
- Bakersfield-Delano, CA
- Merced, CA
- Fresno-Madera, CA
- Los Angeles-Long Beach-Riverside, CA
- Hanford-Corcoran, CA
- Modesto, CA
- Visalia-Porterville, CA
- Pittsburgh-New Castle, PA
- El Centro, CA
- Cincinnati-Middletown-Wilmington, OH-KY-IN
- Philadelphia-Camden-Vineland, PA-NJ-DE-MD
- St. Louis-St. Charles-Farmington, MO-IL
- Louisville-Jefferson County-Elizabethtown-Scottsburg, KY-IN
- Allentown-Bethlehem-Easton, PA-NJ
- Macon-Warner Robins-Fort Valley, GA
- Fairbanks, AK
- Canton-Massillon, OH
- Atlanta-Sandy Springs-Gainesville, GA-AL
- Phoenix-Mesa-Glendale, AZ
- Indianapolis-Anderson-Columbus, IN
- Cleveland-Akron-Elyria, OH
- Wheeling, WV-OH
- Steubenville-Weirton, OH-WV
- Birmingham-Hoover-Cullman, AL
- Dayton-Springfield-Greenville, OH
FACT: When inhaled, ozone irritates the lungs, resulting in something like a bad sunburn within the lungs.
