Table 6a: Top 25 Cleanest Counties for Long-term Particle Pollution (Annual PM2.5)1
| Rank2
| County,State
| Design Value3
|
| 1 |
Elbert, CO |
4.5
|
| 2 |
Billings, ND |
4.7
|
| 3 |
Laramie, WY |
4.9
|
| 4 |
Santa Fe, NM |
5.0
|
| 4 |
Maui, HI |
5.0
|
| 4 |
Lake, CA |
5.0
|
| 7 |
Honolulu, HI |
5.3
|
| 8 |
San Miguel, CO |
5.6
|
| 9 |
La Plata, CO |
5.7
|
| 10 |
Burke, ND |
5.9
|
| 11 |
Cascade, MT |
6.0
|
| 11 |
Anchorage, AK |
6.0
|
| 11 |
Scotts Bluff, NE |
6.0
|
| 14 |
Columbia, OR |
6.1
|
| 15 |
Inyo, CA |
6.2
|
| 16 |
Meade, SD |
6.3
|
| 16 |
Grant, NM |
6.3
|
| 16 |
Mercer, ND |
6.3
|
| 19 |
Matanuska-Susitna, AK |
6.4
|
| 20 |
Benton, WA |
6.5
|
| 20 |
Campbell, WY |
6.5
|
| 20 |
Hancock, ME |
6.5
|
| 23 |
San Juan, NM |
6.6
|
| 23 |
Bernalillo, NM |
6.6
|
| 23 |
Sanders, MT |
6.6
|
| 23 |
Vilas, WI |
6.6 |
(1) This list represents counties with the lowest levels of monitored long term PM 2.5 air pollution.
(2) Counties are ranked by design value.
(3) The Design Value is the calculated concentration of a pollutant based on the form of the national ambient air quality standard, and is used by EPA to determine if a county meetst he standard. The source for the Design Values is EPA, communication from the Office of Air Quality Planning & Standards, Mark Schmidt, February 1, 2005.
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