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 | |
|---|---|---|---|---|---|---|
| Gaithersburg | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Rockville | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Bethesda | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Bowie | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Aspen Hill | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Wheaton | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| North Bethesda | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Odenton | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Olney | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Suitland-Silver Hill | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Chillum | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| College Park | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Montgomery Village | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Crofton | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Laurel | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| South Laurel | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Suitland | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| North Potomac | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Scaggsville | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Greenbelt | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Fairland | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Landover | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Langley Park | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Greater Upper Marlboro | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Hyattsville | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Ballenger Creek | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Lanham-Seabrook | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Calverton | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Takoma Park | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Shaw | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| White Oak | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Seabrook | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| Redland | MD | 88.9 | Grade A | 4.5 | Improving β | View |
| San Rafael | CA | 88.8 | Grade A | 5 | Improving β | View |
| Grand Junction | CO | 88.8 | Grade A | 4.9 | Stable | View |
| Santa Rosa | CA | 88.8 | Grade A | 5 | Improving β | View |
| Petaluma | CA | 88.8 | Grade A | 5 | Improving β | View |
| Novato | CA | 88.8 | Grade A | 5 | Improving β | View |
| Rohnert Park | CA | 88.8 | Grade A | 5 | Improving β | View |
| Windsor | CA | 88.8 | Grade A | 5 | Improving β | View |
| Clifton | CO | 88.8 | Grade A | 4.9 | Stable | View |
| Atascadero | CA | 88.7 | Grade A | 4.9 | Worsening β | View |
| Paso Robles | CA | 88.7 | Grade A | 4.9 | Worsening β | View |
| Fall River | MA | 88.6 | Grade A | 5.1 | Improving β | View |
| Weymouth | MA | 88.6 | Grade A | 5.1 | Improving β | View |
| New Bedford | MA | 88.6 | Grade A | 5.1 | Improving β | View |
| Quincy | MA | 88.6 | Grade A | 5.1 | Improving β | View |
| Barnstable | MA | 88.6 | Grade A | 5.1 | Improving β | View |
| Braintree | MA | 88.6 | Grade A | 5.1 | Improving β | View |
| Milton | MA | 88.6 | Grade A | 5.1 | Improving β | View |