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Table 6a: Top 25 Cleanest Counties for Long-term Particle Pollution (Annual PM2.5) 1
| Rank
| County, State
| Design Value
|
| 1
| Elbert, CO
| 4.3
|
| 2
| Maui, HI
| 4.8
|
| 3
| Santa Fe, NM
| 4.9
|
| 3
| Honolulu, HI
| 4.9
|
| 3
| Sandoval, NM
| 4.9
|
| 6
| Laramie, WY
| 5.1
|
| 7
| La Plata, CO
| 5.3
|
| 8
| Burke, ND
| 5.6
|
| 9
| Vilas, WI
| 5.8
|
| 10
| Grant, NM
| 6
|
| 10
| Cascade, MT
| 6
|
| 10
| Matanuska-Susitna, AK
| 6
|
| 10
| Mercer, ND
| 6
|
| 14
| Scotts Bluff, NE
| 6.1
|
| 14
| Juneau, AK
| 6.1
|
| 14
| Hancock, ME
| 6.1
|
| 17
| Campbell, WY
| 6.3
|
| 18
| San Juan, NM
| 6.4
|
| 18
| Anchorage, AK
| 6.4
|
| 18
| Bernalillo, NM
| 6.4
|
| 18
| Essex, NY
| 6.4
|
| 22
| Columbia, OR
| 6.5
|
| 22
| Gunnison, CO
| 6.5
|
| 22
| Sanders, MT
| 6.5
|
| 25
| Burleigh, ND
| 6.6 |
(1) This list represents counties with the lowest levels of monitored long term PM2.5 air pollution.
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