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Understand its air.
Explore historical PM2.5 patterns, available local observations, and the context behind each city’s score. 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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Local observations and historical context for major cities.
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| City | State | Score | Grade | PM2.5 (Ann.) | Trend | |
|---|---|---|---|---|---|---|
| Harrisburg | PA | 76 | Grade B | 7.3 | Improving ↓ | View |
| Hagerstown | PA | 76 | Grade B | 7.3 | Improving ↓ | 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 ↓ | View |
| Cedar Rapids | IA | 75.9 | Grade B | 7.3 | Stable | View |
| Clinton | IA | 75.9 | Grade B | 7.4 | Improving ↓ | 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 ↓ | View |
| West Allis | WI | 75.8 | Grade B | 7.1 | Improving ↓ | View |
| Wauwatosa | WI | 75.8 | Grade B | 7.1 | Improving ↓ | View |
| Greenfield | WI | 75.8 | Grade B | 7.1 | Improving ↓ | View |
| Franklin | WI | 75.8 | Grade B | 7.1 | Improving ↓ | View |
| Oak Creek | WI | 75.8 | Grade B | 7.1 | Improving ↓ | View |
| Caledonia | WI | 75.8 | Grade B | 7.1 | Improving ↓ | View |
| Mequon | WI | 75.8 | Grade B | 7.1 | Improving ↓ | View |
| South Milwaukee | WI | 75.8 | Grade B | 7.1 | Improving ↓ | View |
| Cudahy | WI | 75.8 | Grade B | 7.1 | Improving ↓ | 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 ↓ | View |
| Janesville | IL | 75.7 | Grade B | 7.4 | Improving ↓ | View |
| DeKalb | IL | 75.7 | Grade B | 7.4 | Improving ↓ | View |
| Beloit | IL | 75.7 | Grade B | 7.4 | Improving ↓ | View |
| Paradise | CA | 75.7 | Grade B | 6.9 | Stable | View |
| Belvidere | IL | 75.7 | Grade B | 7.4 | Improving ↓ | View |
| Freeport | IL | 75.7 | Grade B | 7.4 | Improving ↓ | View |
| Loves Park | IL | 75.7 | Grade B | 7.4 | Improving ↓ | View |
| Machesney Park | IL | 75.7 | Grade B | 7.4 | Improving ↓ | View |
| Erie | CO | 75.7 | Grade B | 7.1 | Stable | View |
| Belle Glade | FL | 75.6 | Grade B | 7.3 | Improving ↓ | View |
| Salt Lake City | UT | 75.6 | Grade B | 7 | Stable | View |
| The Acreage | FL | 75.6 | Grade B | 7.3 | Improving ↓ | View |
| South Salt Lake | UT | 75.6 | Grade B | 7 | Stable | View |
| Immokalee | FL | 75.6 | Grade B | 7.3 | Improving ↓ | View |
| Ferry Pass | FL | 75.5 | Grade B | 7.4 | Improving ↓ | View |
| East Pensacola Heights | FL | 75.5 | Grade B | 7.4 | Improving ↓ | View |
| Pensacola | FL | 75.5 | Grade B | 7.4 | Improving ↓ | View |
| Navarre | FL | 75.5 | Grade B | 7.4 | Improving ↓ | View |
| Cantonment | FL | 75.5 | Grade B | 7.4 | Improving ↓ | View |
| Bellview | FL | 75.5 | Grade B | 7.4 | Improving ↓ | View |
| Crestview | FL | 75.5 | Grade B | 7.4 | Improving ↓ | View |