Regulations last checked for updates: Feb 09, 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]
§ 81.337 - Oklahoma.

Oklahoma—TSP

Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards
AQCR 017X
AQCR 022X
AQCR 184X
AQCR 185X
AQCR 186:
Tulsa CountyX
Portions of Muskogee CountyX
Portions of Mayes CountyX
Remainder of AQCRX
AQCR 187X
AQCR 188X
AQCR 189:
Portion of Comanche CountyX
Remainder of AQCRX

Oklahoma—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
AQCR 017X
AQCR 184X
AQCR 185X
AQCR 186X
AQCR 187X
AQCR 188X
AQCR 189X

Oklahoma—2010 Sulfur Dioxide NAAQS

[Primary]

Designated area 1 Designation
Date 2 Type
Adair CountyAttainment/Unclassifiable.
Alfalfa CountyAttainment/Unclassifiable.
Atoka CountyAttainment/Unclassifiable.
Beaver CountyAttainment/Unclassifiable.
Beckham CountyAttainment/Unclassifiable.
Blaine CountyAttainment/Unclassifiable.
Bryan CountyAttainment/Unclassifiable.
Caddo CountyAttainment/Unclassifiable.
Canadian CountyAttainment/Unclassifiable.
Carter CountyAttainment/Unclassifiable.
Cherokee CountyAttainment/Unclassifiable.
Choctaw County9/12/2016Attainment/Unclassifiable.
Cimarron CountyAttainment/Unclassifiable.
Cleveland CountyAttainment/Unclassifiable.
Coal CountyAttainment/Unclassifiable.
Comanche CountyAttainment/Unclassifiable.
Cotton CountyAttainment/Unclassifiable.
Craig CountyAttainment/Unclassifiable.
Creek CountyAttainment/Unclassifiable.
Custer CountyAttainment/Unclassifiable.
Delaware CountyAttainment/Unclassifiable.
Dewey CountyAttainment/Unclassifiable.
Ellis CountyAttainment/Unclassifiable.
Garfield County4/30/2021Attainment/Unclassifiable.
Garvin CountyAttainment/Unclassifiable.
Grady CountyAttainment/Unclassifiable.
Grant CountyAttainment/Unclassifiable.
Greer CountyAttainment/Unclassifiable.
Harmon CountyAttainment/Unclassifiable.
Harper CountyAttainment/Unclassifiable.
Haskell CountyAttainment/Unclassifiable.
Hughes CountyAttainment/Unclassifiable.
Jackson CountyAttainment/Unclassifiable.
Jefferson CountyAttainment/Unclassifiable.
Johnston CountyAttainment/Unclassifiable.
Kay CountyAttainment/Unclassifiable.
Kingfisher CountyAttainment/Unclassifiable.
Kiowa CountyAttainment/Unclassifiable.
Latimer CountyAttainment/Unclassifiable.
Le Flore CountyAttainment/Unclassifiable.
Lincoln CountyAttainment/Unclassifiable.
Logan CountyAttainment/Unclassifiable.
Love CountyAttainment/Unclassifiable.
McClain CountyAttainment/Unclassifiable.
McCurtain CountyAttainment/Unclassifiable.
McIntosh CountyAttainment/Unclassifiable.
Major CountyAttainment/Unclassifiable.
Marshall CountyAttainment/Unclassifiable.
Mayes County4/30/2021Attainment/Unclassifiable.
Murray CountyAttainment/Unclassifiable.
Muskogee County4/30/2021Attainment/Unclassifiable.
Noble County9/12/2016Attainment/Unclassifiable.
Nowata CountyAttainment/Unclassifiable.
Okfuskee CountyAttainment/Unclassifiable.
Oklahoma CountyAttainment/Unclassifiable.
Okmulgee CountyAttainment/Unclassifiable.
Osage CountyAttainment/Unclassifiable.
Ottawa CountyAttainment/Unclassifiable.
Pawnee CountyAttainment/Unclassifiable.
Payne CountyAttainment/Unclassifiable.
Pittsburg CountyAttainment/Unclassifiable.
Pontotoc CountyAttainment/Unclassifiable.
Pottawatomie CountyAttainment/Unclassifiable.
Pushmataha CountyAttainment/Unclassifiable.
Roger Mills CountyAttainment/Unclassifiable.
Rogers CountyAttainment/Unclassifiable.
Seminole CountyAttainment/Unclassifiable.
Sequoyah CountyAttainment/Unclassifiable.
Stephens CountyAttainment/Unclassifiable.
Texas CountyAttainment/Unclassifiable.
Tillman CountyAttainment/Unclassifiable.
Tulsa CountyAttainment/Unclassifiable.
Wagoner CountyAttainment/Unclassifiable.
Washington CountyAttainment/Unclassifiable.
Washita CountyAttainment/Unclassifiable.
Woods CountyAttainment/Unclassifiable.
Woodward CountyAttainment/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.

Oklahoma—Carbon Monoxide

Designated Area Designation Classification
Date 1 Type Date 1 Type
AQCR 017 Metropolitan Fort Smith InterstateUnclassifiable/Attainment
Adair County
Cherokee County
Le Flore County
Sequoyah County
AQCR 022 Shreveport-Texarkana-Tyler InterstateUnclassifiable/Attainment
McCurtain County
AQCR 184 Central Oklahoma IntrastateUnclassifiable/Attainment
Canadian County
Cleveland County
Grady County
Kingfisher County
Lincoln County
Logan County
McClain County
Oklahoma County
Pottawatomie County
AQCR 185 North Central Oklahoma IntrastateUnclassifiable/Attainment
Garfield County
Grant County
Kay County
Noble County
Payne County
AQCR 186 Northeastern Oklahoma IntrastateUnclassifiable/Attainment
Craig County
Creek County
Delaware County
Mayes County
Muskogee County
Nowata County
Okmulgee County
Osage County
Ottawa County
Pawnee County
Rogers County
Tulsa County
Wagoner County
Washington County
AQCR 187 Northwestern Oklahoma IntrastateUnclassifiable/Attainment
Alfalfa County
Beaver County
Blaine County
Cimarron County
Custer County
Dewey County
Ellis County
Harper County
Major County
Roger Mills County
Texas County
Woods County
Woodward County
AQCR 188 Southeastern Oklahoma IntrastateUnclassifiable/Attainment
Atoka County
Bryan County
Carter County
Choctaw County
Coal County
Garvin County
Haskell County
Hughes County
Johnston County
Latimer County
Love County
Marshall County
McIntosh County
Murray County
Okfuskee County
Pittsburg County
Pontotoc County
Pushmataha County
Seminole County
AQCR 189 Southwestern Oklahoma IntrastateUnclassifiable/Attainment
Beckham County
Caddo County
Comanche County
Cotton County
Greer County
Harmon County
Jackson County
Jefferson County
Kiowa County
Stephens County
Tillman County
Washita County

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

Oklahoma—Ozone (1-Hour Standard) 2

Designated area Designation Classification
Date 1 Type Date 1 Type
AQCR 017 Metropolitan Fort Smith InterstateUnclassifiable/Attainment
Adair County
Cherokee County
Le Flore County
Sequoyah County
AQCR 022 Shreveport-Texarkana-Tyler IntrastateUnclassifiable/Attainment
McCurtain County
AQCR 184 Central Oklahoma Intrastate (part)
Cleveland CountyUnclassifiable/Attainment
Oklahoma CountyUnclassifiable/Attainment
AQCR 184 Central Oklahoma Intrastate (Remainder of)Unclassifiable/Attainment
Canadian County
Grady County
Kingfisher County
Lincoln County
Logan County
McClain County
Pottawatomie County
AQCR 185 North Central Oklahoma IntrastateUnclassifiable/Attainment
Garfield County
Grant County
Kay County
Noble County
Payne County
AQCR 186 Northeastern Oklahoma IntrastateUnclassifiable/Attainment
Craig County
Creek County
Delaware County
Mayes County
Muskogee County
Nowata County
Okmulgee County
Osage County
Ottawa County
Pawnee County
Rogers County
Tulsa County
Wagoner County
Washington County
AQCR 187 Northwestern Oklahoma IntrastateUnclassifiable/Attainment
Alfalfa County
Beaver County
Blaine County
Cimarron County
Custer County
Dewey County
Ellis County
Harper County
Major County
Roger Mills County
Texas County
Woods County
Woodward County
AQCR 188 Southeastern Oklahoma IntrastateUnclassifiable/Attainment
Atoka County
Bryan County
Carter County
Choctaw County
Coal County
Garvin County
Haskell County
Hughes County
Johnston County
Latimer County
Love County
Marshall County
McIntosh County
Murray County
Okfuskee County
Pittsburg County
Pontotoc County
Pushmataha County
Seminole County
AQCR 189 Southwestern Oklahoma IntrastateUnclassifiable/Attainment
Beckham County
Caddo County
Comanche County
Cotton County
Greer County
Harmon County
Jackson County
Jefferson County
Kiowa County
Stephens County
Tillman County
Washita 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 Oklahoma.

Oklahoma—1997 Annual PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 017 Metropolitan Fort Smith Interstate:
Adair CountyUnclassifiable/Attainment
Cherokee CountyUnclassifiable/Attainment
Le Flore CountyUnclassifiable/Attainment
Sequoyah CountyUnclassifiable/Attainment
AQCR 022 Shreveport-Texarkana-Tyler Intrastate:
McCurtain CountyUnclassifiable/Attainment
AQCR 184 Central Oklahoma Intrastate (part):
Cleveland CountyUnclassifiable/Attainment
Oklahoma CountyUnclassifiable/Attainment
AQCR 184 Central Oklahoma Intrastate (remainder of):
Canadian CountyUnclassifiable/Attainment
Grady CountyUnclassifiable/Attainment
Kingfisher CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Logan CountyUnclassifiable/Attainment
McClain CountyUnclassifiable/Attainment
Pottawatomie CountyUnclassifiable/Attainment
AQCR 185 North Central Oklahoma Intrastate:
Garfield CountyUnclassifiable/Attainment
Grant CountyUnclassifiable/Attainment
Kay CountyUnclassifiable/Attainment
Noble CountyUnclassifiable/Attainment
Payne CountyUnclassifiable/Attainment
AQCR 186 Northeastern Oklahoma Intrastate:
Craig CountyUnclassifiable/Attainment
Creek CountyUnclassifiable/Attainment
Delaware CountyUnclassifiable/Attainment
Mayes CountyUnclassifiable/Attainment
Muskogee CountyUnclassifiable/Attainment
Nowata CountyUnclassifiable/Attainment
Okmulgee CountyUnclassifiable/Attainment
Osage CountyUnclassifiable/Attainment
Ottawa CountyUnclassifiable/Attainment
Pawnee CountyUnclassifiable/Attainment
Rogers CountyUnclassifiable/Attainment
Tulsa CountyUnclassifiable/Attainment
Wagoner CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
AQCR 187 Northwestern Oklahoma Intrastate:
Alfalfa CountyUnclassifiable/Attainment
Beaver CountyUnclassifiable/Attainment
Blaine CountyUnclassifiable/Attainment
Cimarron CountyUnclassifiable/Attainment
Custer CountyUnclassifiable/Attainment
Dewey CountyUnclassifiable/Attainment
Ellis CountyUnclassifiable/Attainment
Harper CountyUnclassifiable/Attainment
Major CountyUnclassifiable/Attainment
Roger Mills CountyUnclassifiable/Attainment
Texas CountyUnclassifiable/Attainment
Woods CountyUnclassifiable/Attainment
Woodward CountyUnclassifiable/Attainment
AQCR 188 Southeastern Oklahoma Intrastate:
Atoka CountyUnclassifiable/Attainment
Bryan CountyUnclassifiable/Attainment
Carter CountyUnclassifiable/Attainment
Choctaw CountyUnclassifiable/Attainment
Coal CountyUnclassifiable/Attainment
Garvin CountyUnclassifiable/Attainment
Haskell CountyUnclassifiable/Attainment
Hughes CountyUnclassifiable/Attainment
Johnston CountyUnclassifiable/Attainment
Latimer CountyUnclassifiable/Attainment
Love CountyUnclassifiable/Attainment
McIntosh CountyUnclassifiable/Attainment
Marshall CountyUnclassifiable/Attainment
Murray CountyUnclassifiable/Attainment
Okfuskee CountyUnclassifiable/Attainment
Pittsburg CountyUnclassifiable/Attainment
Pontotoc CountyUnclassifiable/Attainment
Pushmataha CountyUnclassifiable/Attainment
Seminole CountyUnclassifiable/Attainment
AQCR 189 Southwestern Oklahoma Intrastate:
Beckham CountyUnclassifiable/Attainment
Caddo CountyUnclassifiable/Attainment
Comanche CountyUnclassifiable/Attainment
Cotton CountyUnclassifiable/Attainment
Greer CountyUnclassifiable/Attainment
Harmon CountyUnclassifiable/Attainment
Jackson CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Kiowa CountyUnclassifiable/Attainment
Stephens CountyUnclassifiable/Attainment
Tillman CountyUnclassifiable/Attainment
Washita 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.

Oklahoma—2012 Annual PM2.5 NAAQS

[Primary]

Designated area 1 Designation Classification
Date 2 Type Date 2 Type
AQCR 017 Metropolitan Fort Smith Interstate:
Adair CountyUnclassifiable/Attainment
Cherokee CountyUnclassifiable/Attainment
Le Flore CountyUnclassifiable/Attainment
Sequoyah CountyUnclassifiable/Attainment
AQCR 022 Shreveport-Texarkana-Tyler Intrastate:
McCurtain CountyUnclassifiable/Attainment
AQCR 184 Central Oklahoma Intrastate:
Canadian CountyUnclassifiable/Attainment
Cleveland CountyUnclassifiable/Attainment
Grady CountyUnclassifiable/Attainment
Kingfisher CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Logan CountyUnclassifiable/Attainment
McClain CountyUnclassifiable/Attainment
Oklahoma CountyUnclassifiable/Attainment
Pottawatomie CountyUnclassifiable/Attainment
AQCR 185 North Central Oklahoma Intrastate:
Garfield CountyUnclassifiable/Attainment
Grant CountyUnclassifiable/Attainment
Kay CountyUnclassifiable/Attainment
Noble CountyUnclassifiable/Attainment
Payne CountyUnclassifiable/Attainment
AQCR 186 Northeastern Oklahoma Intrastate:
Craig CountyUnclassifiable/Attainment
Creek CountyUnclassifiable/Attainment
Delaware CountyUnclassifiable/Attainment
Mayes CountyUnclassifiable/Attainment
Muskogee CountyUnclassifiable/Attainment
Nowata CountyUnclassifiable/Attainment
Okmulgee CountyUnclassifiable/Attainment
Osage CountyUnclassifiable/Attainment
Ottawa CountyUnclassifiable/Attainment
Pawnee CountyUnclassifiable/Attainment
Rogers CountyUnclassifiable/Attainment
Tulsa CountyUnclassifiable/Attainment
Wagoner CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
AQCR 187 Northwestern Oklahoma Intrastate:
Alfalfa CountyUnclassifiable/Attainment
Beaver CountyUnclassifiable/Attainment
Blaine CountyUnclassifiable/Attainment
Cimarron CountyUnclassifiable/Attainment
Custer CountyUnclassifiable/Attainment
Dewey CountyUnclassifiable/Attainment
Ellis CountyUnclassifiable/Attainment
Harper CountyUnclassifiable/Attainment
Major CountyUnclassifiable/Attainment
Roger Mills CountyUnclassifiable/Attainment
Texas CountyUnclassifiable/Attainment
Woods CountyUnclassifiable/Attainment
Woodward CountyUnclassifiable/Attainment
AQCR 188 Southeastern Oklahoma Intrastate:
Atoka CountyUnclassifiable/Attainment
Bryan CountyUnclassifiable/Attainment
Carter CountyUnclassifiable/Attainment
Choctaw CountyUnclassifiable/Attainment
Coal CountyUnclassifiable/Attainment
Garvin CountyUnclassifiable/Attainment
Haskell CountyUnclassifiable/Attainment
Hughes CountyUnclassifiable/Attainment
Johnston CountyUnclassifiable/Attainment
Latimer CountyUnclassifiable/Attainment
Love CountyUnclassifiable/Attainment
McIntosh CountyUnclassifiable/Attainment
Marshall CountyUnclassifiable/Attainment
Murray CountyUnclassifiable/Attainment
Okfuskee CountyUnclassifiable/Attainment
Pittsburg CountyUnclassifiable/Attainment
Pontotoc CountyUnclassifiable/Attainment
Pushmataha CountyUnclassifiable/Attainment
Seminole CountyUnclassifiable/Attainment
AQCR 189 Southwestern Oklahoma Intrastate:
Beckham CountyUnclassifiable/Attainment
Caddo CountyUnclassifiable/Attainment
Comanche CountyUnclassifiable/Attainment
Cotton CountyUnclassifiable/Attainment
Greer CountyUnclassifiable/Attainment
Harmon CountyUnclassifiable/Attainment
Jackson CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Kiowa CountyUnclassifiable/Attainment
Stephens CountyUnclassifiable/Attainment
Tillman CountyUnclassifiable/Attainment
Washita 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.

Oklahoma—1997 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 017 Metropolitan Fort Smith Interstate:
Adair CountyUnclassifiable/Attainment.
Cherokee CountyUnclassifiable/Attainment.
Le Flore CountyUnclassifiable/Attainment.
Sequoyah CountyUnclassifiable/Attainment.
AQCR 022 Shreveport-Texarkana-Tyler Intrastate:
McCurtain CountyUnclassifiable/Attainment.
AQCR 184 Central Oklahoma Intrastate:
Canadian CountyUnclassifiable/Attainment.
Cleveland CountyUnclassifiable/Attainment.
Grady CountyUnclassifiable/Attainment.
Kingfisher CountyUnclassifiable/Attainment.
Lincoln CountyUnclassifiable/Attainment.
Logan CountyUnclassifiable/Attainment.
McClain CountyUnclassifiable/Attainment.
Oklahoma CountyUnclassifiable/Attainment.
Pottawatomie CountyUnclassifiable/Attainment.
AQCR 185 North Central Oklahoma Intrastate:
Garfield CountyUnclassifiable/Attainment.
Grant CountyUnclassifiable/Attainment.
Kay CountyUnclassifiable/Attainment.
Noble CountyUnclassifiable/Attainment.
Payne CountyUnclassifiable/Attainment.
AQCR 186 Northeastern Oklahoma Intrastate:
Craig CountyUnclassifiable/Attainment.
Creek CountyUnclassifiable/Attainment.
Delaware CountyUnclassifiable/Attainment.
Mayes CountyUnclassifiable/Attainment.
Muskogee CountyUnclassifiable/Attainment.
Nowata CountyUnclassifiable/Attainment.
Okmulgee CountyUnclassifiable/Attainment.
Osage CountyUnclassifiable/Attainment.
Ottawa CountyUnclassifiable/Attainment.
Pawnee CountyUnclassifiable/Attainment.
Rogers CountyUnclassifiable/Attainment.
Tulsa CountyUnclassifiable/Attainment.
Wagoner CountyUnclassifiable/Attainment.
Washington CountyUnclassifiable/Attainment.
AQCR 187 Northwestern Oklahoma Intrastate:
Alfalfa CountyUnclassifiable/Attainment.
Beaver CountyUnclassifiable/Attainment.
Blaine CountyUnclassifiable/Attainment.
Cimarron CountyUnclassifiable/Attainment.
Custer CountyUnclassifiable/Attainment.
Dewey CountyUnclassifiable/Attainment.
Ellis CountyUnclassifiable/Attainment.
Harper CountyUnclassifiable/Attainment.
Major CountyUnclassifiable/Attainment.
Roger Mills CountyUnclassifiable/Attainment.
Texas CountyUnclassifiable/Attainment.
Woods CountyUnclassifiable/Attainment.
Woodward CountyUnclassifiable/Attainment.
AQCR 188 Southeastern Oklahoma Intrastate:
Atoka CountyUnclassifiable/Attainment.
Bryan CountyUnclassifiable/Attainment.
Carter CountyUnclassifiable/Attainment.
Choctaw CountyUnclassifiable/Attainment.
Coal CountyUnclassifiable/Attainment.
Garvin CountyUnclassifiable/Attainment.
Haskell CountyUnclassifiable/Attainment.
Hughes CountyUnclassifiable/Attainment.
Johnston CountyUnclassifiable/Attainment.
Latimer CountyUnclassifiable/Attainment.
Love CountyUnclassifiable/Attainment.
McIntosh CountyUnclassifiable/Attainment.
Marshall CountyUnclassifiable/Attainment.
Murray CountyUnclassifiable/Attainment.
Okfuskee CountyUnclassifiable/Attainment.
Pittsburg CountyUnclassifiable/Attainment.
Pontotoc CountyUnclassifiable/Attainment.
Pushmataha CountyUnclassifiable/Attainment.
Seminole CountyUnclassifiable/Attainment.
AQCR 189 Southwestern Oklahoma Intrastate:
Beckham CountyUnclassifiable/Attainment.
Caddo CountyUnclassifiable/Attainment.
Comanche CountyUnclassifiable/Attainment.
Cotton CountyUnclassifiable/Attainment.
Greer CountyUnclassifiable/Attainment.
Harmon CountyUnclassifiable/Attainment.
Jackson CountyUnclassifiable/Attainment.
Jefferson CountyUnclassifiable/Attainment.
Kiowa CountyUnclassifiable/Attainment.
Stephens CountyUnclassifiable/Attainment.
Tillman CountyUnclassifiable/Attainment.
Washita 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.

Oklahoma—2006 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 017 Metropolitan Fort Smith Interstate:
Adair CountyUnclassifiable/Attainment.
Cherokee CountyUnclassifiable/Attainment.
Le Flore CountyUnclassifiable/Attainment.
Sequoyah CountyUnclassifiable/Attainment.
AQCR 022 Shreveport-Texarkana-Tyler Intrastate:
McCurtain CountyUnclassifiable/Attainment.
AQCR 184 Central Oklahoma Intrastate:
Canadian CountyUnclassifiable/Attainment.
Cleveland CountyUnclassifiable/Attainment.
Grady CountyUnclassifiable/Attainment.
Kingfisher CountyUnclassifiable/Attainment.
Lincoln CountyUnclassifiable/Attainment.
Logan CountyUnclassifiable/Attainment.
McClain CountyUnclassifiable/Attainment.
Oklahoma CountyUnclassifiable/Attainment.
Pottawatomie CountyUnclassifiable/Attainment.
AQCR 185 North Central Oklahoma Intrastate:
Garfield CountyUnclassifiable/Attainment.
Grant CountyUnclassifiable/Attainment.
Kay CountyUnclassifiable/Attainment.
Noble CountyUnclassifiable/Attainment.
Payne CountyUnclassifiable/Attainment.
AQCR 186 Northeastern Oklahoma Intrastate:
Craig CountyUnclassifiable/Attainment.
Creek CountyUnclassifiable/Attainment.
Delaware CountyUnclassifiable/Attainment.
Mayes CountyUnclassifiable/Attainment.
Muskogee CountyUnclassifiable/Attainment.
Nowata CountyUnclassifiable/Attainment.
Okmulgee CountyUnclassifiable/Attainment.
Osage CountyUnclassifiable/Attainment.
Ottawa CountyUnclassifiable/Attainment.
Pawnee CountyUnclassifiable/Attainment.
Rogers CountyUnclassifiable/Attainment.
Tulsa CountyUnclassifiable/Attainment.
Wagoner CountyUnclassifiable/Attainment.
Washington CountyUnclassifiable/Attainment.
AQCR 187 Northwestern Oklahoma Intrastate:
Alfalfa CountyUnclassifiable/Attainment.
Beaver CountyUnclassifiable/Attainment.
Blaine CountyUnclassifiable/Attainment.
Cimarron CountyUnclassifiable/Attainment.
Custer CountyUnclassifiable/Attainment.
Dewey CountyUnclassifiable/Attainment.
Ellis CountyUnclassifiable/Attainment.
Harper CountyUnclassifiable/Attainment.
Major CountyUnclassifiable/Attainment.
Roger Mills CountyUnclassifiable/Attainment.
Texas CountyUnclassifiable/Attainment.
Woods CountyUnclassifiable/Attainment.
Woodward CountyUnclassifiable/Attainment.
AQCR 188 Southeastern Oklahoma Intrastate:
Atoka CountyUnclassifiable/Attainment.
Bryan CountyUnclassifiable/Attainment.
Carter CountyUnclassifiable/Attainment.
Choctaw CountyUnclassifiable/Attainment.
Coal CountyUnclassifiable/Attainment.
Garvin CountyUnclassifiable/Attainment.
Haskell CountyUnclassifiable/Attainment.
Hughes CountyUnclassifiable/Attainment.
Johnston CountyUnclassifiable/Attainment.
Latimer CountyUnclassifiable/Attainment.
Love CountyUnclassifiable/Attainment.
McIntosh CountyUnclassifiable/Attainment.
Marshall CountyUnclassifiable/Attainment.
Murray CountyUnclassifiable/Attainment.
Okfuskee CountyUnclassifiable/Attainment.
Pittsburg CountyUnclassifiable/Attainment.
Pontotoc CountyUnclassifiable/Attainment.
Pushmataha CountyUnclassifiable/Attainment.
Seminole CountyUnclassifiable/Attainment.
AQCR 189 Southwestern Oklahoma Intrastate:
Beckham CountyUnclassifiable/Attainment.
Caddo CountyUnclassifiable/Attainment.
Comanche CountyUnclassifiable/Attainment.
Cotton CountyUnclassifiable/Attainment.
Greer CountyUnclassifiable/Attainment.
Harmon CountyUnclassifiable/Attainment.
Jackson CountyUnclassifiable/Attainment.
Jefferson CountyUnclassifiable/Attainment.
Kiowa CountyUnclassifiable/Attainment.
Stephens CountyUnclassifiable/Attainment.
Tillman CountyUnclassifiable/Attainment.
Washita 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.

Oklahoma—NO2 (1971 Annual Standard)

Designated area Does not meet primary standards Cannot be classified or better than national standards
AQCR 017X
AQCR 184X
AQCR 185X
AQCR 186X
AQCR 187X
AQCR 188X
AQCR 189X

Oklahoma—NO2 (2010 1-Hour Standard)

Designated area Designation a
Date 1 Type
Adair CountyUnclassifiable/Attainment.
Alfalfa CountyUnclassifiable/Attainment.
Atoka CountyUnclassifiable/Attainment.
Beaver CountyUnclassifiable/Attainment.
Beckham CountyUnclassifiable/Attainment.
Blaine CountyUnclassifiable/Attainment.
Bryan CountyUnclassifiable/Attainment.
Caddo CountyUnclassifiable/Attainment.
Canadian CountyUnclassifiable/Attainment.
Carter CountyUnclassifiable/Attainment.
Cherokee CountyUnclassifiable/Attainment.
Choctaw CountyUnclassifiable/Attainment.
Cimarron CountyUnclassifiable/Attainment.
Cleveland CountyUnclassifiable/Attainment.
Coal CountyUnclassifiable/Attainment.
Comanche CountyUnclassifiable/Attainment.
Cotton CountyUnclassifiable/Attainment.
Craig CountyUnclassifiable/Attainment.
Creek CountyUnclassifiable/Attainment.
Custer CountyUnclassifiable/Attainment.
Delaware CountyUnclassifiable/Attainment.
Dewey CountyUnclassifiable/Attainment.
Ellis CountyUnclassifiable/Attainment.
Garfield CountyUnclassifiable/Attainment.
Garvin CountyUnclassifiable/Attainment.
Grady CountyUnclassifiable/Attainment.
Grant CountyUnclassifiable/Attainment.
Greer CountyUnclassifiable/Attainment.
Harmon CountyUnclassifiable/Attainment.
Harper CountyUnclassifiable/Attainment.
Haskell CountyUnclassifiable/Attainment.
Hughes CountyUnclassifiable/Attainment.
Jackson CountyUnclassifiable/Attainment.
Jefferson CountyUnclassifiable/Attainment.
Johnston CountyUnclassifiable/Attainment.
Kay CountyUnclassifiable/Attainment.
Kingfisher CountyUnclassifiable/Attainment.
Kiowa CountyUnclassifiable/Attainment.
Latimer CountyUnclassifiable/Attainment.
Le Flore CountyUnclassifiable/Attainment.
Lincoln CountyUnclassifiable/Attainment.
Logan CountyUnclassifiable/Attainment.
Love CountyUnclassifiable/Attainment.
Major CountyUnclassifiable/Attainment.
Marshall CountyUnclassifiable/Attainment.
Mayes CountyUnclassifiable/Attainment.
McClain CountyUnclassifiable/Attainment.
McCurtain CountyUnclassifiable/Attainment.
McIntosh CountyUnclassifiable/Attainment.
Murray CountyUnclassifiable/Attainment.
Muskogee CountyUnclassifiable/Attainment.
Noble CountyUnclassifiable/Attainment.
Nowata CountyUnclassifiable/Attainment.
Okfuskee CountyUnclassifiable/Attainment.
Oklahoma CountyUnclassifiable/Attainment.
Okmulgee CountyUnclassifiable/Attainment.
Osage CountyUnclassifiable/Attainment.
Ottawa CountyUnclassifiable/Attainment.
Pawnee CountyUnclassifiable/Attainment.
Payne CountyUnclassifiable/Attainment.
Pittsburg CountyUnclassifiable/Attainment.
Pontotoc CountyUnclassifiable/Attainment.
Pottawatomie CountyUnclassifiable/Attainment.
Pushmataha CountyUnclassifiable/Attainment.
Roger Mills CountyUnclassifiable/Attainment.
Rogers CountyUnclassifiable/Attainment.
Seminole CountyUnclassifiable/Attainment.
Sequoyah CountyUnclassifiable/Attainment.
Stephens CountyUnclassifiable/Attainment.
Texas CountyUnclassifiable/Attainment.
Tillman CountyUnclassifiable/Attainment.
Tulsa CountyUnclassifiable/Attainment.
Wagoner CountyUnclassifiable/Attainment.
Washington CountyUnclassifiable/Attainment.
Washita CountyUnclassifiable/Attainment.
Woods CountyUnclassifiable/Attainment.
Woodward CountyUnclassifiable/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.

Oklahoma—1997 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area Designation a Category/classification
Date 1 Type Date 1 Type
AQCR 017 Metropolitan Fort Smith InterstateUnclassifiable/Attainment
Adair County
Cherokee County
Le Flore County
Sequoyah County
AQCR 022 Shreveport-Texarkana-Tyler Intrastate: McCurtain CountyUnclassifiable/Attainment
AQCR 184 Central Oklahoma Intrastate (part):
Cleveland CountyUnclassifiable/Attainment
Oklahoma CountyUnclassifiable/Attainment
AQCR 184 Central Oklahoma Intrastate (remainder of)Unclassifiable/Attainment
Canadian County
Grady County
Kingfisher County
Lincoln County
Logan County
McClain County
Pottawatomie County
AQCR 185 North Central Oklahoma IntrastateUnclassifiable/Attainment
Garfield County
Grant County
Kay County
Noble County
Payne County
AQCR 186 Northeastern Oklahoma IntrastateUnclassifiable/Attainment
Craig County
Creek County
Delaware County
Mayes County
Muskogee County
Nowata County
Okmulgee County
Osage County
Ottawa County
Pawnee County
Rogers County
Tulsa County
Wagoner County
Washington County
AQCR 187 Northwestern Oklahoma IntrastateUnclassifiable/Attainment
Alfalfa County
Beaver County
Blaine County
Cimarron County
Custer County
Dewey County
Ellis County
Harper County
Major County
Roger Mills County
Texas County
Woods County
Woodward County
AQCR 188 Southeastern Oklahoma IntrastateUnclassifiable/Attainment
Atoka County
Bryan County
Carter County
Choctaw County
Coal County
Garvin County
Haskell County
Hughes County
Johnston County
Latimer County
Love County
Marshall County
McIntosh County
Murray County
Okfuskee County
Pittsburg County
Pontotoc County
Pushmataha County
Seminole County
AQCR 189 Southwestern Oklahoma IntrastateUnclassifiable/Attainment
Beckham County
Caddo County
Comanche County
Cotton County
Greer County
Harmon County
Jackson County
Jefferson County
Kiowa County
Stephens County
Tillman County
Washita 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.

Oklahoma—2008 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area 1 Designation Classification
Date 2 Type Date 2 Type
Adair CountyUnclassifiable/Attainment
Alfalfa CountyUnclassifiable/Attainment
Atoka CountyUnclassifiable/Attainment
Beaver CountyUnclassifiable/Attainment
Beckham CountyUnclassifiable/Attainment
Blaine CountyUnclassifiable/Attainment
Bryan CountyUnclassifiable/Attainment
Caddo CountyUnclassifiable/Attainment
Canadian CountyUnclassifiable/Attainment
Carter CountyUnclassifiable/Attainment
Cherokee CountyUnclassifiable/Attainment
Choctaw CountyUnclassifiable/Attainment
Cimarron CountyUnclassifiable/Attainment
Cleveland CountyUnclassifiable/Attainment
Coal CountyUnclassifiable/Attainment
Comanche CountyUnclassifiable/Attainment
Cotton CountyUnclassifiable/Attainment
Craig CountyUnclassifiable/Attainment
Creek CountyUnclassifiable/Attainment
Custer CountyUnclassifiable/Attainment
Delaware CountyUnclassifiable/Attainment
Dewey CountyUnclassifiable/Attainment
Ellis CountyUnclassifiable/Attainment
Garfield CountyUnclassifiable/Attainment
Garvin CountyUnclassifiable/Attainment
Grady CountyUnclassifiable/Attainment
Grant CountyUnclassifiable/Attainment
Greer CountyUnclassifiable/Attainment
Harmon CountyUnclassifiable/Attainment
Harper CountyUnclassifiable/Attainment
Haskell CountyUnclassifiable/Attainment
Hughes CountyUnclassifiable/Attainment
Jackson CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Johnston CountyUnclassifiable/Attainment
Kay CountyUnclassifiable/Attainment
Kingfisher CountyUnclassifiable/Attainment
Kiowa CountyUnclassifiable/Attainment
Latimer CountyUnclassifiable/Attainment
Le Flore CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Logan CountyUnclassifiable/Attainment
Love CountyUnclassifiable/Attainment
Major CountyUnclassifiable/Attainment
Marshall CountyUnclassifiable/Attainment
Mayes CountyUnclassifiable/Attainment
McClain CountyUnclassifiable/Attainment
McCurtain CountyUnclassifiable/Attainment
McIntosh CountyUnclassifiable/Attainment
Murray CountyUnclassifiable/Attainment
Muskogee CountyUnclassifiable/Attainment
Noble CountyUnclassifiable/Attainment
Nowata CountyUnclassifiable/Attainment
Okfuskee CountyUnclassifiable/Attainment
Oklahoma CountyUnclassifiable/Attainment
Okmulgee CountyUnclassifiable/Attainment
Osage CountyUnclassifiable/Attainment
Ottawa CountyUnclassifiable/Attainment
Pawnee CountyUnclassifiable/Attainment
Payne CountyUnclassifiable/Attainment
Pittsburg CountyUnclassifiable/Attainment
Pontotoc CountyUnclassifiable/Attainment
Pottawatomie CountyUnclassifiable/Attainment
Pushmataha CountyUnclassifiable/Attainment
Roger Mills CountyUnclassifiable/Attainment
Rogers CountyUnclassifiable/Attainment
Seminole CountyUnclassifiable/Attainment
Sequoyah CountyUnclassifiable/Attainment
Stephens CountyUnclassifiable/Attainment
Texas CountyUnclassifiable/Attainment
Tillman CountyUnclassifiable/Attainment
Tulsa CountyUnclassifiable/Attainment
Wagoner CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
Washita CountyUnclassifiable/Attainment
Woods CountyUnclassifiable/Attainment
Woodward CountyUnclassifiable/Attainment

1 Includes any Indian country in each county or area, unless otherwise specified.

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

Oklahoma—2015 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area 1 Designation Classification
Date 2 Type Date 2 Type
Adair County1/16/2018Attainment/Unclassifiable
Alfalfa County1/16/2018Attainment/Unclassifiable
Atoka County1/16/2018Attainment/Unclassifiable
Beaver County1/16/2018Attainment/Unclassifiable
Beckham County1/16/2018Attainment/Unclassifiable
Blaine County1/16/2018Attainment/Unclassifiable
Bryan CountyAttainment/Unclassifiable
Caddo County1/16/2018Attainment/Unclassifiable
Canadian County1/16/2018Attainment/Unclassifiable
Carter County1/16/2018Attainment/Unclassifiable
Cherokee County1/16/2018Attainment/Unclassifiable
Choctaw County1/16/2018Attainment/Unclassifiable
Cimarron County1/16/2018Attainment/Unclassifiable
Cleveland County1/16/2018Attainment/Unclassifiable
Coal County1/16/2018Attainment/Unclassifiable
Comanche County1/16/2018Attainment/Unclassifiable
Cotton County1/16/2018Attainment/Unclassifiable
Craig County1/16/2018Attainment/Unclassifiable
Creek County1/16/2018Attainment/Unclassifiable
Custer County1/16/2018Attainment/Unclassifiable
Delaware County1/16/2018Attainment/Unclassifiable
Dewey County1/16/2018Attainment/Unclassifiable
Ellis County1/16/2018Attainment/Unclassifiable
Garfield County1/16/2018Attainment/Unclassifiable
Garvin County1/16/2018Attainment/Unclassifiable
Grady County1/16/2018Attainment/Unclassifiable
Grant County1/16/2018Attainment/Unclassifiable
Greer County1/16/2018Attainment/Unclassifiable
Harmon County1/16/2018Attainment/Unclassifiable
Harper County1/16/2018Attainment/Unclassifiable
Haskell County1/16/2018Attainment/Unclassifiable
Hughes County1/16/2018Attainment/Unclassifiable
Jackson County1/16/2018Attainment/Unclassifiable
Jefferson County1/16/2018Attainment/Unclassifiable
Johnston County1/16/2018Attainment/Unclassifiable
Kay County1/16/2018Attainment/Unclassifiable
Kingfisher County1/16/2018Attainment/Unclassifiable
Kiowa County1/16/2018Attainment/Unclassifiable
Latimer County1/16/2018Attainment/Unclassifiable
Le Flore County1/16/2018Attainment/Unclassifiable
Lincoln County1/16/2018Attainment/Unclassifiable
Logan County1/16/2018Attainment/Unclassifiable
Love County1/16/2018Attainment/Unclassifiable
McClain County1/16/2018Attainment/Unclassifiable
McCurtain County1/16/2018Attainment/Unclassifiable
McIntosh County1/16/2018Attainment/Unclassifiable
Major County1/16/2018Attainment/Unclassifiable
Marshall County1/16/2018Attainment/Unclassifiable
Mayes County1/16/2018Attainment/Unclassifiable
Murray County1/16/2018Attainment/Unclassifiable
Muskogee County1/16/2018Attainment/Unclassifiable
Noble County1/16/2018Attainment/Unclassifiable
Nowata County1/16/2018Attainment/Unclassifiable
Okfuskee County1/16/2018Attainment/Unclassifiable
Oklahoma County1/16/2018Attainment/Unclassifiable
Okmulgee County1/16/2018Attainment/Unclassifiable
Osage County1/16/2018Attainment/Unclassifiable
Ottawa County1/16/2018Attainment/Unclassifiable
Pawnee County1/16/2018Attainment/Unclassifiable
Payne County1/16/2018Attainment/Unclassifiable
Pittsburg County1/16/2018Attainment/Unclassifiable
Pontotoc County1/16/2018Attainment/Unclassifiable
Pottawatomie County1/16/2018Attainment/Unclassifiable
Pushmataha County1/16/2018Attainment/Unclassifiable
Roger Mills County1/16/2018Attainment/Unclassifiable
Rogers County1/16/2018Attainment/Unclassifiable
Seminole County1/16/2018Attainment/Unclassifiable
Sequoyah County1/16/2018Attainment/Unclassifiable
Stephens County1/16/2018Attainment/Unclassifiable
Texas County1/16/2018Attainment/Unclassifiable
Tillman County1/16/2018Attainment/Unclassifiable
Tulsa County1/16/2018Attainment/Unclassifiable
Wagoner County1/16/2018Attainment/Unclassifiable
Washington County1/16/2018Attainment/Unclassifiable
Washita County1/16/2018Attainment/Unclassifiable
Woods County1/16/2018Attainment/Unclassifiable
Woodward County1/16/2018Attainment/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 August 3, 2018, unless otherwise noted.

Oklahoma—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.

[43 FR 8964, Mar. 3, 1978] Editorial Note:For Federal Register citations affecting § 81.337, 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 81.337
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