Clean Air Days by County
The share of monitored days rated good, meaning an Air Quality Index at or below 50.
See Clean Air Days on the interactive map →
Highest counties
| County | Clean Air Days |
|---|---|
| Kenai Peninsula Borough, Alaska | 100.0% |
| North Slope Borough, Alaska | 100.0% |
| Los Alamos County, New Mexico | 100.0% |
| Socorro County, New Mexico | 100.0% |
| Columbiana County, Ohio | 100.0% |
| Lawrence County, Pennsylvania | 100.0% |
| Karnes County, Texas | 100.0% |
| Wilson County, Texas | 100.0% |
| Carroll County, Virginia | 100.0% |
| Hopewell city, Virginia | 100.0% |
| Carbon County, Wyoming | 100.0% |
| Uinta County, Wyoming | 100.0% |
Lowest counties
| County | Clean Air Days |
|---|---|
| Maricopa County, Arizona | 9.0% |
| Los Angeles County, California | 10.4% |
| San Bernardino County, California | 10.9% |
| Riverside County, California | 11.7% |
| San Diego County, California | 12.8% |
| Harris County, Texas | 13.7% |
| Colusa County, California | 18.6% |
| Fresno County, California | 19.4% |
| Tulare County, California | 20.8% |
| Kern County, California | 20.8% |
| Pinal County, Arizona | 21.0% |
| El Paso County, Texas | 22.1% |