Air Pollution, Fine Particulate Matter by County
Average daily density of fine particulate matter (PM2.5) in micrograms per cubic metre. Fine particles penetrate deep into the lungs.
See Air Pollution, Fine Particulate Matter on the interactive map →
Highest counties
| County | Air Pollution, Fine Particulate Matter |
|---|---|
| San Bernardino County, California | 15.6 |
| Fairbanks North Star Borough, Alaska | 15.5 |
| Allegheny County, Pennsylvania | 14.1 |
| San Diego County, California | 13.8 |
| Los Angeles County, California | 13.4 |
| Kern County, California | 12.9 |
| Tulare County, California | 12.9 |
| Riverside County, California | 12.7 |
| Wayne County, Michigan | 12.7 |
| Marion County, Indiana | 12.6 |
| Kings County, California | 12.3 |
| Plumas County, California | 12.2 |
Lowest counties
| County | Air Pollution, Fine Particulate Matter |
|---|---|
| Gallatin County, Montana | 0.9 |
| Converse County, Wyoming | 2.2 |
| Campbell County, Wyoming | 2.4 |
| Apache County, Arizona | 2.5 |
| Custer County, South Dakota | 2.6 |
| Sublette County, Wyoming | 2.8 |
| Park County, Wyoming | 2.9 |
| Niobrara County, Wyoming | 2.9 |
| Santa Fe County, New Mexico | 2.9 |
| Kauai County, Hawaii | 2.9 |
| Hot Springs County, Wyoming | 3.0 |
| Teton County, Idaho | 3.0 |