Metro ranking · cleanest air
Metro Areas with the Cleanest Air The metropolitan areas where residents breathe Good air most often, ranked by share of Good days from EPA Air Quality System monitoring.
100.0% #1 Evanston, WY
50 Metros ranked
Metro figures aggregate the EPA monitors across each Core-Based Statistical Area. Only metros monitored at least
200 days are ranked, so the list reflects sustained clean air rather than a short monitoring window. See the
methodology for how metro AQI is computed.
Top 12 cleanest-air metros Share of monitored days rated Good (AQI 0–50)
1 Evanston, WY 100% 2 Mayaguez, PR 100% 3 Kahului-Wailuku-Lahaina, HI 99.7% 4 Steamboat Springs, CO 99.7% 5 Meridian, MS 99.6% 6 Clearlake, CA 99.5% 7 Show Low, AZ 99.5% 8 Sebastian-Vero Beach, FL 98.9% 9 Lake Havasu City-Kingman, AZ 98.6% 10 Urban Honolulu, HI 98.4% 11 Morehead City, NC 98.1% 12 Ca¤on City, CO 97.8% Good-day share · EPA Air Quality System
# Metro area Good days Median AQI Days monitored 1 Evanston, WY 100.0% 7 297 2 Mayaguez, PR 100.0% 11 341 3 Kahului-Wailuku-Lahaina, HI 99.7% 21 364 4 Steamboat Springs, CO 99.7% 12 365 5 Meridian, MS 99.6% 36 243 6 Clearlake, CA 99.5% 32 363 7 Show Low, AZ 99.5% 13 361 8 Sebastian-Vero Beach, FL 98.8% 35 348 9 Lake Havasu City-Kingman, AZ 98.6% 19 352 10 Urban Honolulu, HI 98.4% 31 366 11 Morehead City, NC 98.1% 35 364 12 Ca¤on City, CO 97.8% 13 362 13 Mount Vernon-Anacortes, WA 97.5% 26 366 14 Bremerton-Silverdale, WA 97.2% 19 351 15 Ithaca, NY 97.1% 35 350 16 Hilo, HI 97.0% 21 366 17 Taos, NM 97.0% 16 365 18 Watertown-Fort Drum, NY 97.0% 32 363 19 Rockland, ME 96.6% 33 355 20 Aberdeen, WA 96.5% 20 366 21 Summerville, GA 96.3% 39 240 22 La Crosse-Onalaska, WI-MN 96.1% 37 205 23 St. Marys, PA 95.8% 34 358 24 Concord, NH 95.8% 37 214 25 Kinston, NC 95.8% 34 308 26 Longview, WA 95.4% 22 366 27 Santa Rosa, CA 95.1% 19 366 28 Jefferson City, MO 95.0% 40 262 29 Ponce, PR 94.3% 3 336 30 Barnstable Town, MA 94.3% 36 353 31 Columbia, MO 94.2% 39 259 32 Vallejo-Fairfield, CA 94.0% 36 365 33 Pierre, SD 93.7% 8 363 34 Red Wing, MN 93.5% 38 248 35 Othello, WA 93.5% 18 351 36 Americus, GA 93.4% 38 244 37 Deming, NM 93.4% 17 365 38 Olympia-Tumwater, WA 93.4% 26 362 39 Arkadelphia, AR 93.3% 35 360 40 Centralia, WA 93.3% 22 360 41 Chambersburg-Waynesboro, PA 93.3% 35 327 42 Crestview-Fort Walton Beach-Destin, FL 93.2% 36 366 43 Shelton, WA 93.2% 21 366 44 Bellingham, WA 92.8% 33 361 45 Vineyard Haven, MA 92.7% 37 357 46 Fond du Lac, WI 92.7% 38 205 47 Havre, MT 92.6% 15 339 48 Lewiston-Auburn, ME 92.6% 31 366 49 Lubbock, TX 92.2% 23 358 50 Cape Coral-Fort Myers, FL 92.1% 37 340
Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS). Good-day share is the share of monitored days with AQI at or below 50; metros monitored 200+ days only.