Regulations last checked for updates: Feb 10, 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]
§ 81.335 - North Dakota.

North Dakota—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
Metropolitan Fargo-Moorhead (Minn), AQCR 130X
Rest of State, AQCR 172X

North Dakota—2010 Sulfur Dioxide NAAQS

[Primary]

Designated area 1 Designation
Date 2 Type
McLean County/Eastern Mercer County, ND9/12/2016Attainment/Unclassifiable.
McLean County
Mercer County (part)
Area east of CR-37/ND 31, east/north of ND 200 ALT, west of the eastern border of Mercer County/Missouri River, south of the Knife River National Historic Site.
Central Mercer County, ND9/12/2016Attainment/Unclassifiable.
Mercer County (part)
Area west of ND 49/61st Ave SW, north of Co. Rd 15/17th St. SW, east of Co. Rd 13, south and east of the town Zap, south of 8th St. SW/ND 200
Rest of State:Attainment/Unclassifiable.
Adams County
Barnes County
Benson County
Billings County
Bottineau County
Bowman County
Burke County
Burleigh County
Cass County
Cavalier County
Dickey County
Divide County
Dunn County
Eddy County
Emmons County
Foster County
Golden Valley County
Grand Forks County
Grant County
Griggs County
Hettinger County
Kidder County
LaMoure County
Logan County
McHenry County
McIntosh County
McKenzie County
Mercer County (part) (remainder)
Morton County
Mountrail County
Nelson County
Oliver County
Pembina County
Pierce County
Ramsey County
Ransom County
Renville County
Richland County
Rolette County
Sargent County
Sheridan County
Sioux County
Slope County
Stark County
Steele County
Stutsman County
Towner County
Traill County
Walsh County
Ward County
Wells County
Williams County4/30/2021

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.

North Dakota—Carbon Monoxide

Designated Area Designation Classification
Date 1 Type Date 1 Type
AQCR 130 Metropolitan Fargo-Moorhead Intrastate
Cass CountyUnclassifiable/Attainment
Rest of StateUnclassifiable/Attainment
Adams County
Barnes County
Benson County
Billings County
Bottineau County
Bowman County
Burke County
Burleigh County
Cavalier County
Dickey County
Divide County
Dunn County
Eddy County
Emmons County
Foster County
Golden Valley County
Grand Forks County
Grant County
Griggs County
Hettinger County
Kidder County
La Moure County
Logan County
McHenry County
McIntosh County
McKenzie County
McLean County
Mercer County
Morton County
Mountrail County
Nelson County
Oliver County
Pembina County
Pierce County
Ramsey County
Ransom County
Renville County
Richland County
Rolette County
Sargent County
Sheridan County
Sioux County
Slope County
Stark County
Steele County
Stutsman County
Towner County
Traill County
Walsh County
Ward County
Wells County
Williams County

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

North Dakota—Ozone (1-Hour Standard) 2

Designated area Designation Classification
Date 1 Type Date 1 Type
AQCR 130 Metropolitan Fargo-Moorhead Interstate.
Cass CountyUnclassifiable/Attainment
Rest of State, AQCR 172Unclassifiable/Attainment
Adams County
Barnes County
Benson County
Billings County
Bottineau County
Bowman County
Burke County
Burleigh County
Cavalier County
Dickey County
Divide County
Dunn County
Eddy County
Emmons County
Foster County
Golden Valley County
Grand Forks County
Grant County
Griggs County
Hettinger County
Kidder County
La Moure County
Logan County
McHenry County
McIntosh County
McKenzie County
McLean County
Mercer County
Morton County
Mountrail County
Nelson County
Oliver County
Pembina County
Pierce County
Ramsey County
Ransom County
Renville County
Richland County
Rolette County
Sargent County
Sheridan County
Sioux County
Slope County
Stark County
Steele County
Stutsman County
Towner County
Traill County
Walsh County
Ward County
Wells County
Williams 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 North Dakota.

North Dakota—PM-10

Designated Area Designation Classification
Date Type Date Type
Metropolitan Fargo-Moorhead (Minn.), AQCR 13011/15/1990Unclassifiable
Rest of State, AQCR 172 111/15/1990Unclassifiable

1 Denotes a single area designation for PSD baseline area purposes.

North Dakota—1997 Annual PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 130 Metropolitan Fargo-Moorhead Interstate:
Cass CountyUnclassifiable/Attainment.
Rest of State, AQCR 172:
Adams CountyUnclassifiable/Attainment.
Barnes CountyUnclassifiable/Attainment.
Benson CountyUnclassifiable/Attainment.
Billings CountyUnclassifiable/Attainment.
Bottineau CountyUnclassifiable/Attainment.
Bowman CountyUnclassifiable/Attainment.
Burke CountyUnclassifiable/Attainment.
Burleigh CountyUnclassifiable/Attainment.
Cavalier CountyUnclassifiable/Attainment.
Dickey CountyUnclassifiable/Attainment.
Divide CountyUnclassifiable/Attainment.
Dunn CountyUnclassifiable/Attainment.
Eddy CountyUnclassifiable/Attainment.
Emmons CountyUnclassifiable/Attainment.
Foster CountyUnclassifiable/Attainment.
Golden Valley CountyUnclassifiable/Attainment.
Grand Forks CountyUnclassifiable/Attainment.
Grant CountyUnclassifiable/Attainment.
Griggs CountyUnclassifiable/Attainment.
Hettinger CountyUnclassifiable/Attainment.
Kidder CountyUnclassifiable/Attainment.
LaMoure CountyUnclassifiable/Attainment.
Logan CountyUnclassifiable/Attainment.
McHenry CountyUnclassifiable/Attainment.
McIntosh CountyUnclassifiable/Attainment.
McKenzie CountyUnclassifiable/Attainment.
McLean CountyUnclassifiable/Attainment.
Mercer CountyUnclassifiable/Attainment.
Morton CountyUnclassifiable/Attainment.
Mountrail CountyUnclassifiable/Attainment.
Nelson CountyUnclassifiable/Attainment.
Oliver CountyUnclassifiable/Attainment.
Pembina CountyUnclassifiable/Attainment.
Pierce CountyUnclassifiable/Attainment.
Ramsey CountyUnclassifiable/Attainment.
Ransom CountyUnclassifiable/Attainment.
Renville CountyUnclassifiable/Attainment.
Richland CountyUnclassifiable/Attainment.
Rolette CountyUnclassifiable/Attainment.
Sargent CountyUnclassifiable/Attainment.
Sheridan CountyUnclassifiable/Attainment.
Sioux CountyUnclassifiable/Attainment.
Slope CountyUnclassifiable/Attainment.
Stark CountyUnclassifiable/Attainment.
Steele CountyUnclassifiable/Attainment.
Stutsman CountyUnclassifiable/Attainment.
Towner CountyUnclassifiable/Attainment.
Traill CountyUnclassifiable/Attainment.
Walsh CountyUnclassifiable/Attainment.
Ward CountyUnclassifiable/Attainment.
Wells CountyUnclassifiable/Attainment.
Williams 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.

North Dakota—2012 Annual PM2.5 NAAQS

[Primary]

Designated area 1 Designation Classification
Date 2 Type Date 2 Type
AQCR 130 Metropolitan Fargo-Moorhead Interstate:
Cass CountyUnclassifiable/Attainment
Rest of State, AQCR 172:
Adams CountyUnclassifiable/Attainment
Barnes CountyUnclassifiable/Attainment
Benson CountyUnclassifiable/Attainment
Billings CountyUnclassifiable/Attainment
Bottineau CountyUnclassifiable/Attainment
Bowman CountyUnclassifiable/Attainment
Burke CountyUnclassifiable/Attainment
Burleigh CountyUnclassifiable/Attainment
Cavalier CountyUnclassifiable/Attainment
Dickey CountyUnclassifiable/Attainment
Divide CountyUnclassifiable/Attainment
Dunn CountyUnclassifiable/Attainment
Eddy CountyUnclassifiable/Attainment
Emmons CountyUnclassifiable/Attainment
Foster CountyUnclassifiable/Attainment
Golden Valley CountyUnclassifiable/Attainment
Grand Forks CountyUnclassifiable/Attainment
Grant CountyUnclassifiable/Attainment
Griggs CountyUnclassifiable/Attainment
Hettinger CountyUnclassifiable/Attainment
Kidder CountyUnclassifiable/Attainment
LaMoure CountyUnclassifiable/Attainment
Logan CountyUnclassifiable/Attainment
McHenry CountyUnclassifiable/Attainment
McIntosh CountyUnclassifiable/Attainment
McKenzie CountyUnclassifiable/Attainment
McLean CountyUnclassifiable/Attainment
Mercer CountyUnclassifiable/Attainment
Morton CountyUnclassifiable/Attainment
Mountrail CountyUnclassifiable/Attainment
Nelson CountyUnclassifiable/Attainment
Oliver CountyUnclassifiable/Attainment
Pembina CountyUnclassifiable/Attainment
Pierce CountyUnclassifiable/Attainment
Ramsey CountyUnclassifiable/Attainment
Ransom CountyUnclassifiable/Attainment
Renville CountyUnclassifiable/Attainment
Richland CountyUnclassifiable/Attainment
Rolette CountyUnclassifiable/Attainment
Sargent CountyUnclassifiable/Attainment
Sheridan CountyUnclassifiable/Attainment
Sioux CountyUnclassifiable/Attainment
Slope CountyUnclassifiable/Attainment
Stark CountyUnclassifiable/Attainment
Steele CountyUnclassifiable/Attainment
Stutsman CountyUnclassifiable/Attainment
Towner CountyUnclassifiable/Attainment
Traill CountyUnclassifiable/Attainment
Walsh CountyUnclassifiable/Attainment
Ward CountyUnclassifiable/Attainment
Wells CountyUnclassifiable/Attainment
Williams 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.

North Dakota—1997 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 130 Metropolitan Fargo-Moorhead Interstate:
Cass CountyUnclassifiable/Attainment.
Rest of State, AQCR 172:
Adams CountyUnclassifiable/Attainment.
Barnes CountyUnclassifiable/Attainment.
Benson CountyUnclassifiable/Attainment.
Billings CountyUnclassifiable/Attainment.
Bottineau CountyUnclassifiable/Attainment.
Bowman CountyUnclassifiable/Attainment.
Burke CountyUnclassifiable/Attainment.
Burleigh CountyUnclassifiable/Attainment.
Cavalier CountyUnclassifiable/Attainment.
Dickey CountyUnclassifiable/Attainment.
Divide CountyUnclassifiable/Attainment.
Dunn CountyUnclassifiable/Attainment.
Eddy CountyUnclassifiable/Attainment.
Emmons CountyUnclassifiable/Attainment.
Foster CountyUnclassifiable/Attainment.
Golden Valley CountyUnclassifiable/Attainment.
Grand Forks CountyUnclassifiable/Attainment.
Grant CountyUnclassifiable/Attainment.
Griggs CountyUnclassifiable/Attainment.
Hettinger CountyUnclassifiable/Attainment.
Kidder CountyUnclassifiable/Attainment.
LaMoure CountyUnclassifiable/Attainment.
Logan CountyUnclassifiable/Attainment.
McHenry CountyUnclassifiable/Attainment.
McIntosh CountyUnclassifiable/Attainment.
McKenzie CountyUnclassifiable/Attainment.
McLean CountyUnclassifiable/Attainment.
Mercer CountyUnclassifiable/Attainment.
Morton CountyUnclassifiable/Attainment.
Mountrail CountyUnclassifiable/Attainment.
Nelson CountyUnclassifiable/Attainment.
Oliver CountyUnclassifiable/Attainment.
Pembina CountyUnclassifiable/Attainment.
Pierce CountyUnclassifiable/Attainment.
Ramsey CountyUnclassifiable/Attainment.
Ransom CountyUnclassifiable/Attainment.
Renville CountyUnclassifiable/Attainment.
Richland CountyUnclassifiable/Attainment.
Rolette CountyUnclassifiable/Attainment.
Sargent CountyUnclassifiable/Attainment.
Sheridan CountyUnclassifiable/Attainment.
Sioux CountyUnclassifiable/Attainment.
Slope CountyUnclassifiable/Attainment.
Stark CountyUnclassifiable/Attainment.
Steele CountyUnclassifiable/Attainment.
Stutsman CountyUnclassifiable/Attainment.
Towner CountyUnclassifiable/Attainment.
Traill CountyUnclassifiable/Attainment.
Walsh CountyUnclassifiable/Attainment.
Ward CountyUnclassifiable/Attainment.
Wells CountyUnclassifiable/Attainment.
Williams 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.

North Dakota—2006 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 130 Metropolitan Fargo-Moorhead Interstate:
Cass CountyUnclassifiable/Attainment.
Rest of State, AQCR 172:
Adams CountyUnclassifiable/Attainment.
Barnes CountyUnclassifiable/Attainment.
Benson CountyUnclassifiable/Attainment.
Billings CountyUnclassifiable/Attainment.
Bottineau CountyUnclassifiable/Attainment.
Bowman CountyUnclassifiable/Attainment.
Burke CountyUnclassifiable/Attainment.
Burleigh CountyUnclassifiable/Attainment.
Cavalier CountyUnclassifiable/Attainment.
Dickey CountyUnclassifiable/Attainment.
Divide CountyUnclassifiable/Attainment.
Dunn CountyUnclassifiable/Attainment.
Eddy CountyUnclassifiable/Attainment.
Emmons CountyUnclassifiable/Attainment.
Foster CountyUnclassifiable/Attainment.
Golden Valley CountyUnclassifiable/Attainment.
Grand Forks CountyUnclassifiable/Attainment.
Grant CountyUnclassifiable/Attainment.
Griggs CountyUnclassifiable/Attainment.
Hettinger CountyUnclassifiable/Attainment.
Kidder CountyUnclassifiable/Attainment.
LaMoure CountyUnclassifiable/Attainment.
Logan CountyUnclassifiable/Attainment.
McHenry CountyUnclassifiable/Attainment.
McIntosh CountyUnclassifiable/Attainment.
McKenzie CountyUnclassifiable/Attainment.
McLean CountyUnclassifiable/Attainment.
Mercer CountyUnclassifiable/Attainment.
Morton CountyUnclassifiable/Attainment.
Mountrail CountyUnclassifiable/Attainment.
Nelson CountyUnclassifiable/Attainment.
Oliver CountyUnclassifiable/Attainment.
Pembina CountyUnclassifiable/Attainment.
Pierce CountyUnclassifiable/Attainment.
Ramsey CountyUnclassifiable/Attainment.
Ransom CountyUnclassifiable/Attainment.
Renville CountyUnclassifiable/Attainment.
Richland CountyUnclassifiable/Attainment.
Rolette CountyUnclassifiable/Attainment.
Sargent CountyUnclassifiable/Attainment.
Sheridan CountyUnclassifiable/Attainment.
Sioux CountyUnclassifiable/Attainment.
Slope CountyUnclassifiable/Attainment.
Stark CountyUnclassifiable/Attainment.
Steele CountyUnclassifiable/Attainment.
Stutsman CountyUnclassifiable/Attainment.
Towner CountyUnclassifiable/Attainment.
Traill CountyUnclassifiable/Attainment.
Walsh CountyUnclassifiable/Attainment.
Ward CountyUnclassifiable/Attainment.
Wells CountyUnclassifiable/Attainment.
Williams 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.

North Dakota—NO2 (1971 Annual Standard)

Designated area Does not meet primary standards Cannot be classified or better than national standards
Metropolitan Fargo-Moorhead (Minn), AQCR 130X
Rest of State, AQCR 172X

North Dakota—NO2 (2010 1-Hour Standard)

Designated area Designation a
Date 1 Type
State of North DakotaUnclassifiable/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.

North Dakota—1997 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area Designation a Category/classification
Date 1 Type Date 1 Type
AQCR 130 Metropolitan Fargo-Moorhead Interstate:
Cass CountyUnclassifiable/Attainment
Rest of State, AQCR 172Unclassifiable/Attainment
Adams County
Barnes County
Benson County
Billings County
Bottineau County
Bowman County
Burke County
Burleigh County
Cavalier County
Dickey County
Divide County
Dunn County
Eddy County
Emmons County
Foster County
Golden Valley County
Grand Forks County
Grant County
Griggs County
Hettinger County
Kidder County
LaMoure County
Logan County
McHenry County
McIntosh County
McKenzie County
McLean County
Mercer County
Morton County
Mountrail County
Nelson County
Oliver County
Pembina County
Pierce County
Ramsey County
Ransom County
Renville County
Richland County
Rolette County
Sargent County
Sheridan County
Sioux County
Slope County
Stark County
Steele County
Stutsman County
Towner County
Traill County
Walsh County
Ward County
Wells County
Williams 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.

North Dakota—2008 8-Hour Ozone NAAQS

[Primary and Secondary]

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

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

North Dakota—2015 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area 1 Designation Classification
Date 2 Type Date Type
StatewideAttainment/Unclassifiable
Adams County
Barnes County
Benson County
Billings County
Bottineau County
Bowman County
Burke County
Burleigh County
Cass County
Cavalier County
Dickey County
Divide County
Dunn County
Eddy County
Emmons County
Foster County
Golden Valley County
Grand Forks County
Grant County
Griggs County
Hettinger County
Kidder County
LaMoure County
Logan County
McHenry County
McIntosh County
McKenzie County
McLean County
Mercer County
Morton County
Mountrail County
Nelson County
Oliver County
Pembina County
Pierce County
Ramsey County
Ransom County
Renville County
Richland County
Rolette County
Sargent County
Sheridan County
Sioux County
Slope County
Stark County
Steele County
Stutsman County
Towner County
Traill County
Walsh County
Ward County
Wells County
Williams County

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.

North Dakota—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.

[55 FR 23933, June 13, 1990] Editorial Note:For Federal Register citations affecting § 81.335, 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 81.335
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