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 | |
|---|---|---|---|---|---|---|
| Harrisburg | PA | 76 | Grade B | 7.3 | Improving β | View |
| Hagerstown | PA | 76 | Grade B | 7.3 | Improving β | View |
| Florence | AL | 76 | Grade B | 7.3 | Stable | View |
| East Florence | AL | 76 | Grade B | 7.3 | Stable | View |
| Athens | AL | 76 | Grade B | 7.3 | Stable | View |
| Chambersburg | PA | 76 | Grade B | 7.3 | Improving β | View |
| Cedar Rapids | IA | 75.9 | Grade B | 7.3 | Stable | View |
| Clinton | IA | 75.9 | Grade B | 7.4 | Improving β | View |
| North Charleston | SC | 75.9 | Grade B | 7.4 | Stable | View |
| Charleston | SC | 75.9 | Grade B | 7.4 | Stable | View |
| Mount Pleasant | SC | 75.9 | Grade B | 7.4 | Stable | View |
| Waterloo | IA | 75.9 | Grade B | 7.3 | Stable | View |
| Summerville | SC | 75.9 | Grade B | 7.4 | Stable | View |
| Goose Creek | SC | 75.9 | Grade B | 7.4 | Stable | View |
| Marion | IA | 75.9 | Grade B | 7.3 | Stable | View |
| Hanahan | SC | 75.9 | Grade B | 7.4 | Stable | View |
| Milwaukee | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| West Allis | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| Wauwatosa | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| Greenfield | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| Franklin | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| Oak Creek | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| Caledonia | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| Mequon | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| South Milwaukee | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| Cudahy | WI | 75.8 | Grade B | 7.1 | Improving β | View |
| Chico | CA | 75.7 | Grade B | 6.9 | Stable | View |
| Longmont | CO | 75.7 | Grade B | 7.1 | Stable | View |
| Rockford | IL | 75.7 | Grade B | 7.4 | Improving β | View |
| Janesville | IL | 75.7 | Grade B | 7.4 | Improving β | View |
| DeKalb | IL | 75.7 | Grade B | 7.4 | Improving β | View |
| Beloit | IL | 75.7 | Grade B | 7.4 | Improving β | View |
| Paradise | CA | 75.7 | Grade B | 6.9 | Stable | View |
| Belvidere | IL | 75.7 | Grade B | 7.4 | Improving β | View |
| Freeport | IL | 75.7 | Grade B | 7.4 | Improving β | View |
| Loves Park | IL | 75.7 | Grade B | 7.4 | Improving β | View |
| Machesney Park | IL | 75.7 | Grade B | 7.4 | Improving β | View |
| Erie | CO | 75.7 | Grade B | 7.1 | Stable | View |
| Belle Glade | FL | 75.6 | Grade B | 7.3 | Improving β | View |
| Salt Lake City | UT | 75.6 | Grade B | 7 | Stable | View |
| The Acreage | FL | 75.6 | Grade B | 7.3 | Improving β | View |
| South Salt Lake | UT | 75.6 | Grade B | 7 | Stable | View |
| Immokalee | FL | 75.6 | Grade B | 7.3 | Improving β | View |
| Ferry Pass | FL | 75.5 | Grade B | 7.4 | Improving β | View |
| East Pensacola Heights | FL | 75.5 | Grade B | 7.4 | Improving β | View |
| Pensacola | FL | 75.5 | Grade B | 7.4 | Improving β | View |
| Navarre | FL | 75.5 | Grade B | 7.4 | Improving β | View |
| Cantonment | FL | 75.5 | Grade B | 7.4 | Improving β | View |
| Bellview | FL | 75.5 | Grade B | 7.4 | Improving β | View |
| Crestview | FL | 75.5 | Grade B | 7.4 | Improving β | View |