Explore Air Quality by City
Your entry point to US city air quality data. Check AQI today, compare median AQI in 2021, and see unhealthy days per year for any city. Browse EPA-based Clean Air Scores, see how cities compare in our National Rankings, and learn about our data sources in the Methodology.
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| City | State | Score | Grade | PM2.5 (Ann.) | Trend | |
|---|---|---|---|---|---|---|
| Hawthorne | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Lakewood | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Bellflower | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Lynwood | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Redondo Beach | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Pico Rivera | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Florence-Graham | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Gardena | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Paramount | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Bell Gardens | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Bell | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Willowbrook | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Manhattan Beach | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Lawndale | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Westmont | CA | 38 | Grade F | 12.1 | Worsening β | View |
| West Whittier-Los Nietos | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Cudahy | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Lennox | CA | 38 | Grade F | 12.1 | Worsening β | View |
| West Carson | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Hermosa Beach | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Santa Fe Springs | CA | 38 | Grade F | 12.1 | Worsening β | View |
| El Segundo | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Artesia | CA | 38 | Grade F | 12.1 | Worsening β | View |
| Nampa | ID | 37.6 | Grade F | 9.7 | Worsening β | View |
| Boise | ID | 37.6 | Grade F | 9.7 | Worsening β | View |
| Meridian | ID | 37.6 | Grade F | 9.7 | Worsening β | View |
| Caldwell | ID | 37.6 | Grade F | 9.7 | Worsening β | View |
| Eagle | ID | 37.6 | Grade F | 9.7 | Worsening β | View |
| Kuna | ID | 37.6 | Grade F | 9.7 | Worsening β | View |
| Bend | OR | 37.3 | Grade F | 9.3 | Stable | View |
| Redmond | OR | 37.3 | Grade F | 9.3 | Stable | View |
| Hanford | CA | 37 | Grade F | 11.9 | Stable | View |
| Lemoore | CA | 37 | Grade F | 11.9 | Stable | View |
| Coalinga | CA | 37 | Grade F | 11.9 | Stable | View |
| Fresno | CA | 36.4 | Grade F | 12.1 | Worsening β | View |
| Selma | CA | 36.4 | Grade F | 12.1 | Worsening β | View |
| Visalia | CA | 34.8 | Grade F | 13 | Stable | View |
| Tulare | CA | 34.8 | Grade F | 13 | Stable | View |
| Porterville | CA | 34.8 | Grade F | 13 | Stable | View |
| Reedley | CA | 34.8 | Grade F | 13 | Stable | View |
| Dinuba | CA | 34.8 | Grade F | 13 | Stable | View |
| Ontario | CA | 30.7 | Grade F | 14.7 | Stable | View |
| Rancho Cucamonga | CA | 30.7 | Grade F | 14.7 | Stable | View |
| Pomona | CA | 30.7 | Grade F | 14.7 | Stable | View |
| Chino | CA | 30.7 | Grade F | 14.7 | Stable | View |
| Chino Hills | CA | 30.7 | Grade F | 14.7 | Stable | View |
| Upland | CA | 30.7 | Grade F | 14.7 | Stable | View |
| Eastvale | CA | 30.7 | Grade F | 14.7 | Stable | View |
| Diamond Bar | CA | 30.7 | Grade F | 14.7 | Stable | View |
| Glendora | CA | 30.7 | Grade F | 14.7 | Stable | View |