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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 | |
|---|---|---|---|---|---|---|
| Newark | DE | 77.1 | Grade B | 7.1 | Stable | View |
| Iowa City | IA | 77.1 | Grade B | 7.1 | Improving ↓ | View |
| Michigan City | IN | 77.1 | Grade B | 7.1 | Improving ↓ | View |
| LaPorte | IN | 77.1 | Grade B | 7.1 | Improving ↓ | View |
| La Porte | IN | 77.1 | Grade B | 7.1 | Improving ↓ | View |
| Coralville | IA | 77.1 | Grade B | 7.1 | Improving ↓ | View |
| Middletown | DE | 77.1 | Grade B | 7.1 | Stable | View |
| Bear | DE | 77.1 | Grade B | 7.1 | Stable | View |
| Mesa | AZ | 77 | Grade B | 7 | Worsening ↑ | View |
| Simi Valley | CA | 77 | Grade B | 7.1 | Stable | View |
| Galveston | TX | 77 | Grade B | 7.1 | Improving ↓ | View |
| Chandler | AZ | 77 | Grade B | 7 | Worsening ↑ | View |
| Gilbert | AZ | 77 | Grade B | 7 | Worsening ↑ | View |
| Santa Clarita | CA | 77 | Grade B | 7.1 | Stable | View |
| Valencia | CA | 77 | Grade B | 7.1 | Stable | View |
| Woodland Hills | CA | 77 | Grade B | 7.1 | Stable | View |
| Northridge | CA | 77 | Grade B | 7.1 | Stable | View |
| Canoga Park | CA | 77 | Grade B | 7.1 | Stable | View |
| North Hills | CA | 77 | Grade B | 7.1 | Stable | View |
| Texas City | TX | 77 | Grade B | 7.1 | Improving ↓ | View |
| West Hills | CA | 77 | Grade B | 7.1 | Stable | View |
| Chatsworth | CA | 77 | Grade B | 7.1 | Stable | View |
| Moorpark | CA | 77 | Grade B | 7.1 | Stable | View |
| Santa Paula | CA | 77 | Grade B | 7.1 | Stable | View |
| Lake Jackson | TX | 77 | Grade B | 7.1 | Improving ↓ | View |
| Fountain Hills | AZ | 77 | Grade B | 7 | Worsening ↑ | View |
| Calabasas | CA | 77 | Grade B | 7.1 | Stable | View |
| Angleton | TX | 77 | Grade B | 7.1 | Improving ↓ | View |
| Castaic | CA | 77 | Grade B | 7.1 | Stable | View |
| Stevenson Ranch | CA | 77 | Grade B | 7.1 | Stable | View |
| Northbrook | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Evanston | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Glenview | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Buffalo Grove | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Wheeling | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Highland Park | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| North Chicago | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Wilmette | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Vernon Hills | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Libertyville | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Lake Forest | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Deerfield | IL | 76.9 | Grade B | 7.2 | Improving ↓ | View |
| Cockeysville | MD | 76.8 | Grade B | 7.2 | Stable | View |
| Towson | MD | 76.8 | Grade B | 7.2 | Stable | View |
| Owings Mills | MD | 76.8 | Grade B | 7.2 | Stable | View |
| Eldersburg | MD | 76.8 | Grade B | 7.2 | Stable | View |
| Reisterstown | MD | 76.8 | Grade B | 7.2 | Stable | View |
| Hunt Valley | MD | 76.8 | Grade B | 7.2 | Stable | View |
| Westminster | MD | 76.8 | Grade B | 7.2 | Stable | View |
| Hollister | CA | 76.7 | Grade B | 7.2 | Worsening ↑ | View |