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 | |
|---|---|---|---|---|---|---|
| Leominster | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Fitchburg | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Marlborough | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Shrewsbury | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Milford | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Gardner | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Southbridge | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Holden | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Auburn | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Grafton | MA | 86.8 | Grade A | 5.4 | Improving β | View |
| Arroyo Grande | CA | 86.5 | Grade A | 5.5 | Improving β | View |
| Atlantic City | NJ | 86.4 | Grade A | 5.5 | Improving β | View |
| Pleasantville | NJ | 86.4 | Grade A | 5.5 | Improving β | View |
| Melbourne | FL | 86.1 | Grade A | 5.6 | Improving β | View |
| Aberdeen | SD | 86.1 | Grade A | 5.3 | Stable | View |
| Palm Bay | FL | 86.1 | Grade A | 5.6 | Improving β | View |
| Merritt Island | FL | 86.1 | Grade A | 5.6 | Improving β | View |
| Rockledge | FL | 86.1 | Grade A | 5.6 | Improving β | View |
| Sebastian | FL | 86.1 | Grade A | 5.6 | Improving β | View |
| West Melbourne | FL | 86.1 | Grade A | 5.6 | Improving β | View |
| Cocoa | FL | 86.1 | Grade A | 5.6 | Improving β | View |
| Bellingham | WA | 85.9 | Grade A | 5.6 | Worsening β | View |
| Pleasanton | CA | 85.8 | Grade A | 5.6 | Improving β | View |
| Fremont | CA | 85.8 | Grade A | 5.6 | Improving β | View |
| Hayward | CA | 85.8 | Grade A | 5.6 | Improving β | View |
| Livermore | CA | 85.8 | Grade A | 5.6 | Improving β | View |
| San Ramon | CA | 85.8 | Grade A | 5.6 | Improving β | View |
| Union City | CA | 85.8 | Grade A | 5.6 | Improving β | View |
| Castro Valley | CA | 85.8 | Grade A | 5.6 | Improving β | View |
| Dublin | CA | 85.8 | Grade A | 5.6 | Improving β | View |
| Newark | CA | 85.8 | Grade A | 5.6 | Improving β | View |
| Brockton | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Taunton | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Randolph | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Norwood | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Stoughton | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Easton | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Mansfield | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Middleborough | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Canton | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Rockland | MA | 85.7 | Grade A | 5.6 | Improving β | View |
| Millville | NJ | 85.5 | Grade A | 5.7 | Improving β | View |
| Vineland | NJ | 85.5 | Grade A | 5.7 | Improving β | View |
| South Vineland | NJ | 85.5 | Grade A | 5.7 | Improving β | View |
| Bridgeton | NJ | 85.5 | Grade A | 5.7 | Improving β | View |
| Seattle | WA | 85.4 | Grade A | 5.7 | Improving β | View |
| Bellevue | WA | 85.4 | Grade A | 5.7 | Improving β | View |
| Kirkland | WA | 85.4 | Grade A | 5.7 | Improving β | View |
| Redmond | WA | 85.4 | Grade A | 5.7 | Improving β | View |
| Shoreline | WA | 85.4 | Grade A | 5.7 | Improving β | View |