Best & Worst Cities for Ozone Pollution Make an Appointment Ask a Question Search Conditions This information has been reviewed and approved by the American Lung Association, 2019. Summary: Best and Worst Cities for Ozone Pollution Cleanest Ozone Cities Anchorage, AL Bangor, ME Bellingham, WA Bowling Green, KY Brownsville, TX Brunswick, GA Burlington, VT Casper, WY Cedar Rapids, IA Clarksville, TN Cleveland, MS Columbia, MO Crestview, FL Des Moines, IA Dothan, AL Eau Claire, WI Fairbanks, AK Fargo, ND Fayetteville, NC Fayetteville, AR Florence, SC Fort Smith, AR Gadsden, AL Greenville, NC Hickory, NC Thibodaux, LA Idaho Falls, ID Jackson, MS Most Ozone Polluted Cities Los Angeles, CA Visalia, CA Bakersfield, CA Fresno, CA Sacramento, CA San Diego, CA Phoenix, AZ San Jose, CA Houston, TX New York, NY Source: American Lung Association, "State of Air" 2019 Bad or Ground-Level Ozone is created when vehicle and other emissions mix with pollutants and are heated by the sun. Warmer weather increases ground-level ozone pollution. Protect Your Lungs from Ozone Pollution Watch local air quality advisories. Take medications exactly as prescribed. Stay indoors as much as possible and close windows. Use circulate setting on home thermostat to keep polluted air out. Exercise or be outside in the mornings when ozone levels are lowest. Stay indoors when pollution levels are high. Call your doctor if symptoms increase or if you need more medication. This information has been reviewed and approved by Anthony Gerber, MD (June 2019) More Information on Pollution Air Pollution & Asthma Indoor Air Pollution Wildfire Smoke Cardiology Programs Diabetes Program Adult Asthma Treatment Programs Pediatric Asthma Treatment Programs COPD Program Make an Appointment Find a Doctor Want to use this on your website? Fill out the content usage request form and then copy this code: You may use this infographic or our Best and Worst Cities for Ozone Pollution (pdf) with permission by completing our content usage request form.