Regulations last checked for updates: Feb 07, 2026

Title 40 - Protection of Environment last revised: Dec 22, 2026
All TitlesTitle 40Chapter IPart 81Subpart C - Subpart C—Section 107 Attainment Status Designations
View all text of Subpart C [§ 81.300 - § 81.356]
§ 81.313 - Idaho.

Idaho—1971 Sulfur Dioxide NAAQS

[Primary and Secondary]

Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards
Eastern Idaho Intrastate AQCR 61:
PocatelloX
Remainder of AQCR 61X
Eastern Washington-Northern Idaho Interstate AQCR 62 (Idaho Portion):
Silver Valley (Shoshone County)X
Remainder of AQCR 62 (Idaho Portion)X
Idaho Intrastate AQCR 63X
Metropolitan Boise Intrastate AQCR 64X

Idaho—2010 Sulfur Dioxide NAAQS

[Primary]

Designated area 1 Designation
Date 2 Type
Entire StateAttainment/Unclassifiable.

1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

2 This date is April 9, 2018, unless otherwise noted.

Idaho—Carbon Monoxide

Designated Area Designation Classification
Date 1 Type Date 1 Type
Boise—Northern Ada County Area:
The Boise-Ada County nonattainment area is described as follows: Beginning at a point in the center of the channel of the Boise River which the section line between sections fifteen (15) and sixteen (16), Township three (3) north, range four (4) east crosses said river; thence down the center of the channel of the Boise River to a point opposite the mouth of Mores Creek. Thence in a straight line north forty four (44) degrees and 36 minutes west until the said line intersects the north line of Township five (5) north (12 Ter. Ses. 67); thence west to the northwest corner of Township five (5) north, range one (1) west; thence southerly to the northwest corner of Township three (3) north, range one (1) west; thence east to the northwest corner of Section four (4) township three (3) north, range one (1) west; thence south to the southeast corner of section thirty-two (32), township two (2) north, range one (1) west; thence, west to the northwest corner township one (1) north, range one (1) west; thence southerly to the southwest corner of township one (1) north, range one (1) west; thence east to the southwest corner of section thirty-three (33), township one (1) north, range four (4) east; thence in a northerly direction along the north and south centerline of township one (1), two (2) and three (3) north, range four (4) east, Boise Meridian, to a point in the center of the channel of the Boise River where the section line between section fifteen (15) and sixteen (16) township three (3) north, range four (4) east, Boise Meridian crosses said Boise River, the point of beginning12/27/2002Attainment.
AQCR 61 Eastern Idaho IntrastateUnclassifiable/Attainment
Bannock County
Bear Lake County
Bingham County
Bonneville County
Butte County
Caribou County
Clark County
Franklin County
Fremont County
Jefferson County
Madison County
Oneida County
Power County
Teton County
AQCR 62 Eastern Washington N Idaho InterstateUnclassifiable/Attainment
Benewah County
Kootenai County
Latah County
Nez Perce County
Shoshone County
AQCR 63 Idaho IntrastateUnclassifiable/Attainment
Adams County
Blaine County
Boise County
Bonner County
Boundary County
Camas County
Cassia County
Clearwater County
Custer County
Elmore County
Gem County
Gooding County
Idaho County
Jerome County
Lemhi County
Lewis County
Lincoln County
Minidoka County
Owyhee County
Payette County
Twin Falls County
Valley County
Washington County
AQCR 64 Metropolitan Boise Intrastate (Remainder of)Unclassifiable/Attainment
Ada County (part)
Remainder of County
Canyon County

1 This date is November 15, 1990, unless otherwise noted.

Idaho—Ozone (1-Hour Standard) 2

Designated area Designation Classification
Date 1 Type Date 1 Type
AQCR 61 Eastern Idaho IntrastateUnclassifiable/Attainment
Bannock County
Bear Lake County
Bingham County
Bonneville County
Butte County
Caribou County
Clark County
Franklin County
Fremont County
Jefferson County
Madison County
Oneida County
Power County
Teton County
AQCR 62 E Washington-N Idaho InterstateUnclassifiable/Attainment
Benewah County
Kootenai County
Latah County
Nez Perce County
Shoshone County
AQCR 63 Idaho IntrastateUnclassifiable/Attainment
Adams County
Blaine County
Boise County
Bonner County
Boundary County
Camas County
Cassia County
Clearwater County
Custer County
Elmore County
Gem County
Gooding County
Idaho County
Jerome County
Lemhi County
Lewis County
Lincoln County
Minidoka County
Owyhee County
Payette County
Twin Falls County
Valley County
Washington County
AQCR 64 Metropolitan Boise InterstateUnclassifiable/Attainment
Ada County
Canyon County

1 This date is October 18, 2000, unless otherwise noted.

2 The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in Idaho.

Idaho PM-10

Designated area Designation Classification
Date Type Date Type
Eastern Idaho IntraState AQCR 61:08/14/2006Attainment.
Power-Bannock Counties, part of: (Pocatello)
State Lands-Portneuf Valley Area:
T.5S, R.34E Sections 25-36
T.5S, R.35E Section 31
T.6S, R.34E Sections 1-36
T.6S, R.35E Sections 5-9, 16-21, 28-33, plus the west 1/2 of sections 10, 15, 22, 27, 34
T.7S, R.34E Sections 1-4, 10-14, and 24
T.7S, R.35E Sections 4-9, 16-21, 28-33, plus the west 1/2 of sections 3, 10, 15, 22, 27, 34
T.8S, R.35E Section 4 plus the west 1/2 of section 3
Power-Bannock Counties, part of: (Pocatello)11/15/1990Nonattainment11/15/1990Moderate
Fort Hall Indian Reservation:
T.5S, R.34E Sections 15-23
T.5S, R.33E Sections 13-36
T.6S, R.33E Sections 1-36
T.7S, R.33E Sections 4, 5, 6
T.7S, R.34E Section 8
Pocatello: 336 square mile area from Schiller at the northwest to Inkom at southeast, excluding the Portneuf Valley and Fort Hall nonattainment areas11/15/1990Unclassifiable
Soda Springs: 96 square mile area encompassing Soda Springs, Conda and the industrial area in between11/15/1990Unclassifiable
Remainder of AQCR 6111/15/1990Unclassifiable
Eastern Washington-Northern Idaho Interstate AQCR 62 (Idaho portion):
Shoshone County: Pinehurst Expansion Area Northwest quarter of the Northwest quarter, Section 8, Township 48 North, Range 2 East; Southwest quarter of the Northwest quarter, Section 8, Township 48, North, Range 2 East; Northwest quarter of the Southwest quarter, Section 8, Township 48 North, Range 2 East; Southwest quarter, Section 8, Township 48 North, Range 2 East; Southwest quarter of the Southwest quarter, Section 48 North, Range 2 East, Boise Base (known as “Pinehurst expansion area”)10/11/2018Attainment
City of Pinehurst10/11/2018Attainment
Idaho Intrastate AQCR 63:
Bonner County: Sandpoint Area: Section 1-3, 9-12, 15, 16, 21, 22, 27, 28 of range 2 west and Township 57 north; and the western 3/4 of Sections 14, 23 and 26 of the same Township and range coordinates06/3/2013Attainment
Remainder of AQCR 6311/15/1990Unclassifiable
Metropolitan Boise the Intrastate AQCR 64:
Ada County: Boise—Northern Boundary—Beginning at a point in the center of the channel of the Boise River, where the line between sections 15 and 16 in Township 3 north (T3N), range 4 east (R4E), crosses said Boise river; thence, west down the center of the channel of the Boise River to a point opposite the mouth of More's Creek; thence, in a straight line north 44 degrees and 38 minutes west until the said line intersects the north line T5N (12 Ter. Ses. 67); thence west to the northwest corner T5N, R1W Western Boundary—Thence, south to the northwest corner of T3N, R1W; thence east to the northwest corner of section 4 of T3N, R1W; thence south to the southeast corner of section 32 of T2N, R1W; thence, west to the northwest corner of T1N, R1W; thence, south to the southwest corner of section 32 of T2N, R1W; thence, west to the northwest corner of T1N, R1W; thence south to the southwest corner of T1N, R1W Southern Boundary—Thence, east to the southwest corner of section 33 of T1N, R4E Eastern Boundary—Thence, north along the north and south center line of Townships T1N, R4E, T2N, R4E, and T3N, R4E, Boise Meridian to the beginning point in the center of the channel of the Boise River.12/26/2003Attainment
Remainder of AQCR 6411/15/1990Unclassifiable.

Idaho—1997 Annual PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 61 Eastern Idaho Intrastate:
Bannock CountyUnclassifiable/Attainment
Bear Lake CountyUnclassifiable/Attainment
Bingham CountyUnclassifiable/Attainment
Bonneville CountyUnclassifiable/Attainment
Butte CountyUnclassifiable/Attainment
Caribou CountyUnclassifiable/Attainment
Clark CountyUnclassifiable/Attainment
Franklin CountyUnclassifiable/Attainment
Fremont CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Madison CountyUnclassifiable/Attainment
Oneida CountyUnclassifiable/Attainment
Power CountyUnclassifiable/Attainment
Teton CountyUnclassifiable/Attainment
AQCR 62 E Washington-N Idaho Interstate:
Benewah CountyUnclassifiable/Attainment
Kootenai CountyUnclassifiable/Attainment
Latah CountyUnclassifiable/Attainment
Nez Perce CountyUnclassifiable/Attainment
Shoshone CountyUnclassifiable/Attainment
AQCR 63 Idaho Intrastate:
Adams CountyUnclassifiable/Attainment
Blaine CountyUnclassifiable/Attainment
Boise CountyUnclassifiable/Attainment
Bonner CountyUnclassifiable/Attainment
Boundary CountyUnclassifiable/Attainment
Camas CountyUnclassifiable/Attainment
Cassia CountyUnclassifiable/Attainment
Clearwater CountyUnclassifiable/Attainment
Custer CountyUnclassifiable/Attainment
Elmore CountyUnclassifiable/Attainment
Gem CountyUnclassifiable/Attainment
Gooding CountyUnclassifiable/Attainment
Idaho CountyUnclassifiable/Attainment
Jerome CountyUnclassifiable/Attainment
Lemhi CountyUnclassifiable/Attainment
Lewis CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Minidoka CountyUnclassifiable/Attainment
Owyhee CountyUnclassifiable/Attainment
Payette CountyUnclassifiable/Attainment
Twin Falls CountyUnclassifiable/Attainment
Valley CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
AQCR 64 Metropolitan Boise Interstate:
Ada CountyUnclassifiable/Attainment
Canyon CountyUnclassifiable/Attainment

a Includes Indian Country located in each county or area, except as otherwise specified.

1 This date is 90 days after January 5, 2005, unless otherwise noted.

Idaho—2012 Annual PM2.5 NAAQS

[Primary]

Designated area 1 Designation Classification
Date 2 Type Date 2 Type
West Silver Valley, ID:
Shoshone County (part)11/16/2021Attainment
That portion of Shoshone County, which is described as follows: T50N, R02E, Sections 14, 15, 22-27, 29-36; T49N, R01E, Sections 2, 11-14, 23-26, 35, 36 and Sections 10,15, 22, 27, 34 east of Kootenai County boundary; T49N, R02E, Sections 1-36; T49N, R03E, Sections 7, 13-36; T49N, R04E, Sections 19, 30, 31; T48N, R01E, Sections 1, 2, 11-14, 22-27, 34-36 and Sections 3, 10, 15 east of Kootenai County boundary; T48N, R02E, Sections 1-36; T48N, R03E, Sections 2-10, 16-20, 30, 31; T48N, R03E, Section 1, NWNW, SWNW, NWSW, SWSW; T48N, R03E, Section 11, NW 1/4, NE 1/4, NWSW, NESW, NWSE, NESE; T48N, R03E, Section 12, NWNW, SWNW, NWSW; T47N, R01E, Sections 1-3, 10-15, 22-27; T47N, R02E, Sections 1-23, 28-30; T47N, R03E, Sections 5-8, 17, and 18
AQCR 61 Eastern Idaho Intrastate:
Bannock CountyUnclassifiable/Attainment
Bear Lake CountyUnclassifiable/Attainment
Bingham CountyUnclassifiable/Attainment
Bonneville CountyUnclassifiable/Attainment
Butte CountyUnclassifiable/Attainment
Caribou CountyUnclassifiable/Attainment
Clark CountyUnclassifiable/Attainment
Franklin CountyUnclassifiable/Attainment
Fremont CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Madison CountyUnclassifiable/Attainment
Oneida CountyUnclassifiable/Attainment
Power CountyUnclassifiable/Attainment
Teton CountyUnclassifiable/Attainment
AQCR 62 E Washington-N Idaho Interstate:
Benewah CountyUnclassifiable/Attainment
Kootenai CountyUnclassifiable/Attainment
Latah CountyUnclassifiable/Attainment
Nez Perce CountyUnclassifiable/Attainment
Shoshone County (remainder)Unclassifiable/Attainment
AQCR 63 Idaho Intrastate:
Adams CountyUnclassifiable/Attainment
Blaine CountyUnclassifiable/Attainment
Boise CountyUnclassifiable/Attainment
Bonner CountyUnclassifiable/Attainment
Boundary CountyUnclassifiable/Attainment
Camas CountyUnclassifiable/Attainment
Cassia CountyUnclassifiable/Attainment
Clearwater CountyUnclassifiable/Attainment
Custer CountyUnclassifiable/Attainment
Elmore CountyUnclassifiable/Attainment
Gem CountyUnclassifiable/Attainment
Gooding CountyUnclassifiable/Attainment
Idaho CountyUnclassifiable/Attainment
Jerome CountyUnclassifiable/Attainment
Lemhi CountyUnclassifiable/Attainment
Lewis CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Minidoka CountyUnclassifiable/Attainment
Owyhee CountyUnclassifiable/Attainment
Payette CountyUnclassifiable/Attainment
Twin Falls CountyUnclassifiable/Attainment
Valley CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
AQCR 64 Metropolitan Boise Interstate:
Ada CountyUnclassifiable/Attainment
Canyon CountyUnclassifiable/Attainment

1 Includes areas of Indian country located in each county or area, except as otherwise specified.

2 This date is April 15, 2015, unless otherwise noted.

Idaho—1997 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
Logan, UT-ID:
Franklin County (part)Unclassifiable/Attainment.
Begin in the bottom left corner (southwest) of the nonattainment area boundary, southwest corner of the PLSS-Boise Meridian, Township 16 South, Range 37 East, Section 25. The boundary then proceeds north to the northwest corner of Township 15 South, Range 37 East, Section 25; then the boundary proceeds east to the southeast corner of Township 15 South, Range 38 East, Section 19; then north to the Franklin County boundary at the northwest corner of Township 13 South, Range 38 East, Section 20. From this point the boundary proceeds east 3.5 sections along the northern border of the county boundary where it then turns south 2 sections, and then proceeds east 5 more sections, and then north 2 sections more. At this point, the boundary leaves the county boundary and proceeds east at the southeast corner of Township 13 South, Range 39 East, Section 14; then the boundary heads north 2 sections to northwest corner of Township 13 South, Range 39 East, Section 12; then the boundary proceeds east 2 sections to the northeast corner of Township 13 South, Range 40 East, Section 7. The boundary then proceeds south 2 sections to the northwest corner of Township 13 South, Range 40 East, Section 20; the boundary then proceeds east 6 sections to the northeast corner of Township 13 South, Range 41 East, Section 19. The boundary then proceeds south 20 sections to the southeast corner of Township 16 South, Range 41 East, Section 30. Finally, the boundary is completed as it proceeds west 20 sections along the southern Idaho state boundary to the southwest corner of the Township 16 South, Range 37 East, Section 25.
Rest of State: AQCR 61 Eastern Idaho Intrastate:
Bannock CountyUnclassifiable/Attainment.
Bear Lake CountyUnclassifiable/Attainment.
Bingham CountyUnclassifiable/Attainment.
Bonneville CountyUnclassifiable/Attainment.
Butte CountyUnclassifiable/Attainment.
Caribou CountyUnclassifiable/Attainment.
Clark CountyUnclassifiable/Attainment.
Franklin County (remainder)Unclassifiable/Attainment.
Fremont CountyUnclassifiable/Attainment.
Jefferson CountyUnclassifiable/Attainment.
Madison CountyUnclassifiable/Attainment.
Oneida CountyUnclassifiable/Attainment.
Power CountyUnclassifiable/Attainment.
Teton CountyUnclassifiable/Attainment.
AQCR 62 E Washington-N Idaho Interstate:
Benewah CountyUnclassifiable/Attainment.
Kootenai CountyUnclassifiable/Attainment.
Latah CountyUnclassifiable/Attainment.
Nez Perce CountyUnclassifiable/Attainment.
Shoshone CountyUnclassifiable/Attainment.
AQCR 63 Idaho Intrastate:
Adams CountyUnclassifiable/Attainment.
Blaine CountyUnclassifiable/Attainment.
Boise CountyUnclassifiable/Attainment.
Bonner CountyUnclassifiable/Attainment.
Boundary CountyUnclassifiable/Attainment.
Camas CountyUnclassifiable/Attainment.
Cassia CountyUnclassifiable/Attainment.
Clearwater CountyUnclassifiable/Attainment.
Custer CountyUnclassifiable/Attainment.
Elmore CountyUnclassifiable/Attainment.
Gem CountyUnclassifiable/Attainment.
Gooding CountyUnclassifiable/Attainment.
Idaho CountyUnclassifiable/Attainment.
Jerome CountyUnclassifiable/Attainment.
Lemhi CountyUnclassifiable/Attainment.
Lewis CountyUnclassifiable/Attainment.
Lincoln CountyUnclassifiable/Attainment.
Minidoka CountyUnclassifiable/Attainment.
Owyhee CountyUnclassifiable/Attainment.
Payette CountyUnclassifiable/Attainment.
Twin Falls CountyUnclassifiable/Attainment.
Valley CountyUnclassifiable/Attainment.
Washington CountyUnclassifiable/Attainment.
AQCR 64 Metropolitan Boise Interstate:
Ada CountyUnclassifiable/Attainment.
Canyon CountyUnclassifiable/Attainment.

a Includes Indian Country located in each county or area, except as otherwise specified.

1 This date is 90 days after January 5, 2005, unless otherwise noted.

Idaho—2006 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date 2 Type
Logan, UT-ID:
Franklin County (part)5/21/2021Attainment
Begin in the bottom left corner (southwest) of the nonattainment area boundary, southwest corner of the PLSS-Boise Meridian, Township 16 South, Range 37 East, Section 25. The boundary then proceeds north to the northwest corner of Township 15 South, Range 37 East, Section 25; then the boundary proceeds east to the southeast corner of Township 15 South, Range 38 East, Section 19; then north to the Franklin County boundary at the northwest corner of Township 13 South, Range 38 East, Section 20. From this point the boundary proceeds east 3.5 sections along the northern border of the county boundary where it then turns south 2 sections, and then proceeds east 5 more sections, and then north 2 sections more. At this point, the boundary leaves the county boundary and proceeds east at the southeast corner of Township 13 South, Range 39 East, Section 14; then the boundary heads north 2 sections to northwest corner of Township 13 South, Range 39 east, Section 12; then the boundary proceeds east 2 sections to the northeast corner of Township 13 South, Range 40 East, Section 7. The boundary then proceeds south 2 sections to the northwest corner of Township 13 South, Range 40 East, Section 20; the boundary then proceeds east 6 sections to the northeast corner of Township 13 South, Range 41 East, Section 19. The boundary then proceeds south 20 sections to the southeast corner of Township 16 South, Range 41 East, Section 30. Finally, the boundary is completed as it proceeds west 20 sections along the southern Idaho state boundary to the southwest corner of the Township 16 South, Range 37 East, Section 25
Rest of State: AQCR 61 Eastern Idaho Intrastate:
Bannock CountyUnclassifiable/Attainment.
Bear Lake CountyUnclassifiable/Attainment.
Bingham CountyUnclassifiable/Attainment.
Bonneville CountyUnclassifiable/Attainment.
Butte CountyUnclassifiable/Attainment.
Caribou CountyUnclassifiable/Attainment.
Clark CountyUnclassifiable/Attainment.
Franklin County (remainder)Unclassifiable/Attainment.
Fremont CountyUnclassifiable/Attainment.
Jefferson CountyUnclassifiable/Attainment.
Madison CountyUnclassifiable/Attainment.
Oneida CountyUnclassifiable/Attainment.
Power CountyUnclassifiable/Attainment.
Teton CountyUnclassifiable/Attainment.
AQCR 62 E Washington-N Idaho Interstate:
Benewah CountyUnclassifiable/Attainment.
Kootenai CountyUnclassifiable/Attainment.
Latah CountyUnclassifiable/Attainment.
Nez Perce CountyUnclassifiable/Attainment.
Shoshone CountyUnclassifiable/Attainment.
AQCR 63 Idaho Intrastate:
Adams CountyUnclassifiable/Attainment.
Blaine CountyUnclassifiable/Attainment.
Boise CountyUnclassifiable/Attainment.
Bonner CountyUnclassifiable/Attainment.
Boundary CountyUnclassifiable/Attainment.
Camas CountyUnclassifiable/Attainment.
Cassia CountyUnclassifiable/Attainment.
Clearwater CountyUnclassifiable/Attainment.
Custer CountyUnclassifiable/Attainment.
Elmore CountyUnclassifiable/Attainment.
Gem CountyUnclassifiable/Attainment.
Gooding CountyUnclassifiable/Attainment.
Idaho CountyUnclassifiable/Attainment.
Jerome CountyUnclassifiable/Attainment.
Lemhi CountyUnclassifiable/Attainment.
Lewis CountyUnclassifiable/Attainment.
Lincoln CountyUnclassifiable/Attainment.
Minidoka CountyUnclassifiable/Attainment.
Owyhee CountyUnclassifiable/Attainment.
Payette CountyUnclassifiable/Attainment.
Twin Falls CountyUnclassifiable/Attainment.
Valley CountyUnclassifiable/Attainment.
Washington CountyUnclassifiable/Attainment.
AQCR 64 Metropolitan Boise Interstate:
Ada CountyUnclassifiable/Attainment.
Canyon CountyUnclassifiable/Attainment.

a Includes Indian Country located in each county or area, except as otherwise specified.

1 This date is 30 days after November 13, 2009, unless otherwise noted.

2 This date is July 2, 2014, unless otherwise noted.

Idaho—NO2 (1971 Annual Standard)

Designated area Does not meet primary standards Cannot be classified or better than national standards
Eastern Idaho Intrastate AQCR 61X
Eastern Washington-Northern Idaho Interstate AQCR 62 (Idaho Portion)X
Idaho Intrastate AQCR 63X
Metropolitan Boise Intrastate AQCR 64X

Idaho—NO2

[2010 1-Hour standard]

Designated area Designation a
Date 1 Type
State of IdahoUnclassifiable/Attainment.

a Includes Indian Country located in each county or area, except as otherwise specified.

1 This date is 90 days after October 31, 2011, unless otherwise noted.

Idaho—1997 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area Designation a Category/classification
Date 1 Type Date 1 Type
AQCR 61 Eastern Idaho IntrastateUnclassifiable/Attainment
Bannock County
Bear Lake County
Bingham County
Bonneville County
Butte County
Caribou County
Clark County
Franklin County
Fremont County
Jefferson County
Madison County
Oneida County
Power County
Teton County
AQCR 62 E Washington-N Idaho InterstateUnclassifiable/Attainment
Benewah County
Kootenai County
Latah County
Nez Perce County
Shoshone County
AQCR 63 Idaho IntrastateUnclassifiable/Attainment
Adams County
Blaine County
Boise County
Bonner County
Boundary County
Camas County
Cassia County
Clearwater County
Custer County
Elmore County
Gem County
Gooding County
Idaho County
Jerome County
Lemhi County
Lewis County
Lincoln County
Minidoka County
Owyhee County
Payette County
Twin Falls County
Valley County
Washington County
AQCR 64 Metropolitan Boise InterstateUnclassifiable/Attainment
Ada County
Canyon County

a Includes Indian Country located in each county or area, except as otherwise specified.

1 This date is June 15, 2004, unless otherwise noted.

Idaho—2008 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area 2 Designation Classification
Date 1 Type Date 1 Type
Statewide and Any Areas of Indian CountryUnclassifiable/Attainment

1 This date is July 20, 2012, unless otherwise noted.

Idaho—2015 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area 1 Designation Classification
Date 2 Type Date Type
StatewideAttainment/Unclassifiable

1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

2 This date is January 16, 2018, unless otherwise noted.

Idaho—2008 Lead NAAQS

Designated area Designation for the 2008 NAAQS a
Date 1 Type
Whole StateUnclassifiable/Attainment.

a Includes Indian Country located in each county or area, except as otherwise specified.

1 December 31, 2011 unless otherwise noted.

[54 FR 27344, June 29, 1989] Editorial Note:For Federal Register citations affecting § 81.313, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.
authority: 42 U.S.C. 7401,
source: 36 FR 22421, Nov. 25, 1971, unless otherwise noted.
cite as: 40 CFR 81.313
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