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Table 6a: Top 25 Cleanest Counties for Long-term Particle Pollution (Annual PM2.5)1
|
2007 Rank2 |
County |
State |
Design Value3 |
|
1
|
CONVERSE
|
WY
|
3.6
|
|
2
|
ELBERT
|
CO
|
4.4
|
|
3
|
LAKE
|
CA
|
4.6
|
|
4
|
BILLINGS
|
ND
|
4.7
|
|
4
|
LARAMIE
|
WY
|
4.7
|
|
6
|
SAN MIGUEL
|
CO
|
4.8
|
|
6
|
SANTA FE
|
NM
|
4.8
|
|
8
|
INYO
|
CA
|
4.9
|
|
8
|
MAUI
|
HI
|
4.9
|
|
10
|
MC KENZIE
|
ND
|
5.1
|
|
11
|
HONOLULU
|
HI
|
5.2
|
|
12
|
JACKSON
|
SD
|
5.5
|
|
13
|
CASS
|
MN
|
5.6
|
|
14
|
SCOTTS BLUFF
|
NE
|
5.7
|
|
15
|
BURKE
|
ND
|
5.9
|
|
15
|
GRANT
|
NM
|
5.9
|
|
17
|
CASCADE
|
MT
|
6
|
|
17
|
ASHLAND
|
WI
|
6
|
|
19
|
ESSEX
|
NY
|
6.1
|
|
19
|
MERCER
|
ND
|
6.1
|
|
19
|
SAN JUAN
|
NM
|
6.1
|
|
22
|
COCONINO
|
AZ
|
6.2
|
|
22
|
PIMA
|
AZ
|
6.2
|
|
22
|
HANCOCK
|
ME
|
6.2
|
|
25 |
CAMPBELL |
WY |
6.3 |
(1) This list represents counties with the lowest levels of monitored long-term PM2.5 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 NAAQS. EPA uses the design value to determine if a county meets the health-based standard. The source for the Design Values is EPA, communication from the Office of Air Quality Planning & Standards, Mark Schmidt, October 30, 2006.
Tables continued... |
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