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 | |
|---|---|---|---|---|---|---|
| Horizon City | TX | 49.5 | Grade D | 10.7 | Worsening β | View |
| Anaheim | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Santa Ana | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Irvine | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Huntington Beach | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Garden Grove | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Orange | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Fullerton | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Costa Mesa | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| West Covina | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Mission Viejo | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Westminster | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Whittier | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Newport Beach | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Buena Park | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Lake Forest | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Tustin | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Yorba Linda | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Laguna Niguel | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| San Clemente | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| La Habra | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| South Whittier | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Fountain Valley | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Hacienda Heights | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Placentia | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Aliso Viejo | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Cerritos | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| La Mirada | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Rancho Santa Margarita | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Cypress | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Rowland Heights | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Brea | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| La Puente | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Stanton | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| San Juan Capistrano | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Dana Point | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Laguna Hills | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| North Tustin | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Laguna Beach | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Ladera Ranch | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Valinda | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| West Puente Valley | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| South San Jose Hills | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Laguna Woods | CA | 49.4 | Grade D | 10.9 | Worsening β | View |
| Stockton | CA | 49 | Grade D | 10.2 | Worsening β | View |
| Houston | TX | 49 | Grade D | 11.2 | Worsening β | View |
| Alief | TX | 49 | Grade D | 11.2 | Worsening β | View |
| Sugar Land | TX | 49 | Grade D | 11.2 | Worsening β | View |
| Missouri City | TX | 49 | Grade D | 11.2 | Worsening β | View |
| Atascocita | TX | 49 | Grade D | 11.2 | Worsening β | View |