Regulations last checked for updates: Dec 18, 2025

Title 40 - Protection of Environment last revised: Dec 11, 2025
All TitlesTitle 40Chapter IPart 81Subpart C - Subpart C—Section 107 Attainment Status Designations
View all text of Subpart C [§ 81.300 - § 81.356]
§ 81.304 - Arkansas.

Arkansas—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 016X
AQCR 017X
AQCR 018X
AQCR 019X
AQCR 020X
AQCR 021X
AQCR 022X

Arkansas—2010 Sulfur Dioxide NAAQS

[Primary]

Designated area 1 Designation
Date 2 Type
Arkansas CountyAttainment/Unclassifiable.
Ashley CountyAttainment/Unclassifiable.
Baxter CountyAttainment/Unclassifiable.
Benton CountyAttainment/Unclassifiable.
Boone CountyAttainment/Unclassifiable.
Bradley CountyAttainment/Unclassifiable.
Calhoun CountyAttainment/Unclassifiable.
Carroll CountyAttainment/Unclassifiable.
Chicot CountyAttainment/Unclassifiable.
Clark CountyAttainment/Unclassifiable.
Clay CountyAttainment/Unclassifiable.
Cleburne CountyAttainment/Unclassifiable.
Cleveland CountyAttainment/Unclassifiable.
Columbia CountyAttainment/Unclassifiable.
Conway CountyAttainment/Unclassifiable.
Craighead CountyAttainment/Unclassifiable.
Crawford CountyAttainment/Unclassifiable.
Crittenden CountyAttainment/Unclassifiable.
Cross CountyAttainment/Unclassifiable.
Dallas CountyAttainment/Unclassifiable.
Desha CountyAttainment/Unclassifiable.
Drew CountyAttainment/Unclassifiable.
Faulkner CountyAttainment/Unclassifiable.
Franklin CountyAttainment/Unclassifiable.
Fulton CountyAttainment/Unclassifiable.
Garland CountyAttainment/Unclassifiable.
Grant CountyAttainment/Unclassifiable.
Greene CountyAttainment/Unclassifiable.
Hempstead CountyAttainment/Unclassifiable.
Hot Spring CountyAttainment/Unclassifiable.
Howard CountyAttainment/Unclassifiable.
Independence County4/12/2019Attainment/Unclassifiable.
Izard CountyAttainment/Unclassifiable.
Jackson CountyAttainment/Unclassifiable.
Jefferson County9/12/2016Attainment/Unclassifiable.
Johnson CountyAttainment/Unclassifiable.
Lafayette CountyAttainment/Unclassifiable.
Lawrence CountyAttainment/Unclassifiable.
Lee CountyAttainment/Unclassifiable.
Lincoln CountyAttainment/Unclassifiable.
Little River CountyAttainment/Unclassifiable.
Logan CountyAttainment/Unclassifiable.
Lonoke CountyAttainment/Unclassifiable.
Madison CountyAttainment/Unclassifiable.
Marion CountyAttainment/Unclassifiable.
Miller CountyAttainment/Unclassifiable.
Mississippi CountyAttainment/Unclassifiable.
Monroe CountyAttainment/Unclassifiable.
Montgomery CountyAttainment/Unclassifiable.
Nevada CountyAttainment/Unclassifiable.
Newton CountyAttainment/Unclassifiable.
Ouachita CountyAttainment/Unclassifiable.
Perry CountyAttainment/Unclassifiable.
Phillips CountyAttainment/Unclassifiable.
Pike CountyAttainment/Unclassifiable.
Poinsett CountyAttainment/Unclassifiable.
Polk CountyAttainment/Unclassifiable.
Pope CountyAttainment/Unclassifiable.
Prairie CountyAttainment/Unclassifiable.
Pulaski CountyAttainment/Unclassifiable.
Randolph CountyAttainment/Unclassifiable.
St. Francis CountyAttainment/Unclassifiable.
Saline CountyAttainment/Unclassifiable.
Scott CountyAttainment/Unclassifiable.
Searcy CountyAttainment/Unclassifiable.
Sebastian CountyAttainment/Unclassifiable.
Sevier CountyAttainment/Unclassifiable.
Sharp CountyAttainment/Unclassifiable.
Stone CountyAttainment/Unclassifiable.
Union CountyAttainment/Unclassifiable.
Van Buren CountyAttainment/Unclassifiable.
Washington CountyAttainment/Unclassifiable.
White CountyAttainment/Unclassifiable.
Woodruff CountyAttainment/Unclassifiable.
Yell 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.

Arkansas—Carbon Monoxide

Designated Area Designation Classification
Date 1 Type Date 1 Type
AQCR 016 Central Arkansas IntrastateUnclassifiable/Attainment
Chicot County
Clark County
Cleveland County
Conway County
Dallas County
Desha County
Drew County
Faulkner County
Garland County
Grant County
Hot Spring County
Jefferson County
Lincoln County
Lonoke County
Perry County
Pope County
Pulaski County
Saline County
Yell County
AQCR 017 Metropolitan Fort Smith InterstateUnclassifiable/Attainment
Benton County
Crawford County
Sebastian County
Washington County
AQCR 018 Metropolitan Memphis InterstateUnclassifiable/Attainment
Crittenden County
AQCR 019 Monroe (Louisiana)-El Dorado InterstateUnclassifiable/Attainment
Ashley County
Bradley County
Calhoun County
Nevada County
Ouachita County
Union County
AQCR 020 Northeast Arkansas IntrastateUnclassifiable/Attainment
Arkansas County
Clay County
Craighead County
Cross County
Greene County
Independence County
Jackson County
Lawrence County
Lee County
Mississippi County
Monroe County
Phillips County
Poinsett County
Prairie County
Randolph County
Sharp County
St. Francis County
White County
Woodruff County
AQCR 021 Northwest Arkansas IntrastateUnclassifiable/Attainment
Baxter County
Boone County
Carroll County
Cleburne County
Franklin County
Fulton County
Izard County
Johnson County
Logan County
Madison County
Marion County
Montgomery County
Newton County
Pike County
Polk County
Scott County
Searcy County
Stone County
Van Buren County
AQCR 022 Shreveport-Texarkana-Tyler InterstateUnclassifiable/Attainment
Columbia County
Hempstead County
Howard County
Lafayette County
Little River County
Miller County
Sevier County

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

Arkansas—Ozone (1-Hour Standard) 2

Designated area Designation Classification
Date 1 Type Date 1 Type
AQCR 016 Central Arkansas Intrastate (part) Pulaski CountyUnclassifiable/Attainment
AQCR 016 Central Arkansas Intrastate (Remainder of)Unclassifiable/Attainment
Chicot County
Clark County
Cleveland County
Conway County
Dallas County
Desha County
Drew County
Faulkner County
Garland County
Grant County
Hot Spring County
Jefferson County
Lincoln County
Lonoke County
Perry County
Pope County
Saline County
Yell County
AQCR 017 Metropolitan Fort Smith InterstateUnclassifiable/Attainment
Benton County
Crawford County
Sebastian County
Washington County
AQCR 018 Metropolitan Memphis InterstateUnclassifiable/Attainment
Crittenden County
AQCR 019 Monroe-El Dorado InterstateUnclassifiable/Attainment
Ashley County
Bradley County
Calhoun County
Nevada County
Ouachita County
Union County
AQCR 020 Northeast Arkansas IntrastateUnclassifiable/Attainment
Arkansas County
Clay County
Craighead County
Cross County
Greene County
Independence County
Jackson County
Lawrence County
Lee County
Mississippi County
Monroe County
Phillips County
Poinsett County
Prairie County
Randolph County
Sharp County
St. Francis County
White County
Woodruff County
AQCR 021 Northwest Arkansas IntrastateUnclassifiable/Attainment
Baxter County
Boone County
Carroll County
Cleburne County
Franklin County
Fulton County
Izard County
Johnson County
Logan County
Madison County
Marion County
Montgomery County
Newton County
Pike County
Polk County
Scott County
Searcy County
Stone County
Van Buren County
AQCR 022 Shreveport-Texarkana-Tyler InterstateUnclassifiable/Attainment
Columbia County
Hempstead County
Howard County
Lafayette County
Little River County
Miller County
Sevier 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 Arkansas.

Arkansas—PM-10

Designated area Designation Classification
Date Type Date Type
AQCR 016 Central Arkansas IntrastateUnclassifiableUnclassifiable.
AQCR 017 Metropolitan Fort Smith InterstateUnclassifiableUnclassifiable.
AQCR 018 Metropolitan Memphis IntrastateUnclassifiableUnclassifiable.
AQCR 019 Monroe (Louisiana)-El Dorado InterstateUnclassifiableUnclassifiable.
AQCR 020 Northeast Arkansas IntrastateUnclassifiableUnclassifiable.
AQCR 021 Northwest Arkansas IntrastateUnclassifiableUnclassifiable.
AQCR 022 Shreveport-Texarkana-Tyler InterstateUnclassifiableUnclassifiable.

Arkansas—1997 Annual PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 016 Central Arkansas Intrastate:
Chicot CountyUnclassifiable/Attainment
Clark CountyUnclassifiable/Attainment
Cleveland CountyUnclassifiable/Attainment
Conway CountyUnclassifiable/Attainment
Dallas CountyUnclassifiable/Attainment
Desha CountyUnclassifiable/Attainment
Drew CountyUnclassifiable/Attainment
Faulkner CountyUnclassifiable/Attainment
Garland CountyUnclassifiable/Attainment
Grant CountyUnclassifiable/Attainment
Hot Spring CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Lonoke CountyUnclassifiable/Attainment
Perry CountyUnclassifiable/Attainment
Pope CountyUnclassifiable/Attainment
Pulaski CountyUnclassifiable/Attainment
Saline CountyUnclassifiable/Attainment
Yell CountyUnclassifiable/Attainment
AQCR 017 Metropolitan Fort Smith Interstate:
Benton CountyUnclassifiable/Attainment
Crawford CountyUnclassifiable/Attainment
Sebastian CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
AQCR 019 Monroe-El Dorado Interstate:
Ashley CountyUnclassifiable/Attainment
Bradley CountyUnclassifiable/Attainment
Calhoun CountyUnclassifiable/Attainment
Nevada CountyUnclassifiable/Attainment
Ouachita CountyUnclassifiable/Attainment
Union CountyUnclassifiable/Attainment
AQCR 020 Northeast Arkansas Intrastate:
Arkansas CountyUnclassifiable/Attainment
Clay CountyUnclassifiable/Attainment
Craighead CountyUnclassifiable/Attainment
Cross CountyUnclassifiable/Attainment
Greene CountyUnclassifiable/Attainment
Independence CountyUnclassifiable/Attainment
Jackson CountyUnclassifiable/Attainment
Lawrence CountyUnclassifiable/Attainment
Lee CountyUnclassifiable/Attainment
Mississippi CountyUnclassifiable/Attainment
Monroe CountyUnclassifiable/Attainment
Phillips CountyUnclassifiable/Attainment
Poinsett CountyUnclassifiable/Attainment
Prairie CountyUnclassifiable/Attainment
Randolph CountyUnclassifiable/Attainment
St. Francis CountyUnclassifiable/Attainment
Sharp CountyUnclassifiable/Attainment
White CountyUnclassifiable/Attainment
Woodruff CountyUnclassifiable/Attainment
AQCR 021 Northwest Arkansas Intrastate:
Baxter CountyUnclassifiable/Attainment
Boone CountyUnclassifiable/Attainment
Carroll CountyUnclassifiable/Attainment
Cleburne CountyUnclassifiable/Attainment
Franklin CountyUnclassifiable/Attainment
Fulton CountyUnclassifiable/Attainment
Izard CountyUnclassifiable/Attainment
Johnson CountyUnclassifiable/Attainment
Logan CountyUnclassifiable/Attainment
Madison CountyUnclassifiable/Attainment
Marion CountyUnclassifiable/Attainment
Montgomery CountyUnclassifiable/Attainment
Newton CountyUnclassifiable/Attainment
Pike CountyUnclassifiable/Attainment
Polk CountyUnclassifiable/Attainment
Scott CountyUnclassifiable/Attainment
Searcy CountyUnclassifiable/Attainment
Stone CountyUnclassifiable/Attainment
Van Buren CountyUnclassifiable/Attainment
AQCR 022 Shreveport-Texarkana-Tyler Interstate:
Columbia CountyUnclassifiable/Attainment
Hempstead CountyUnclassifiable/Attainment
Howard CountyUnclassifiable/Attainment
Lafayette CountyUnclassifiable/Attainment
Little River CountyUnclassifiable/Attainment
Miller CountyUnclassifiable/Attainment
Sevier CountyUnclassifiable/Attainment
Memphis, TN-AR: (AQCR 018 Metropolitan Memphis Interstate):
Crittenden 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.

Arkansas—2012 Annual PM2.5 NAAQS

[Primary]

Designated area 1 Designation Classification
Date 2 Type Date 2 Type
AQCR 016 Central Arkansas Intrastate:
Chicot CountyUnclassifiable/Attainment
Clark CountyUnclassifiable/Attainment
Cleveland CountyUnclassifiable/Attainment
Conway CountyUnclassifiable/Attainment
Dallas CountyUnclassifiable/Attainment
Desha CountyUnclassifiable/Attainment
Drew CountyUnclassifiable/Attainment
Faulkner CountyUnclassifiable/Attainment
Garland CountyUnclassifiable/Attainment
Grant CountyUnclassifiable/Attainment
Hot Spring CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Lonoke CountyUnclassifiable/Attainment
Perry CountyUnclassifiable/Attainment
Pope CountyUnclassifiable/Attainment
Pulaski CountyUnclassifiable/Attainment
Saline CountyUnclassifiable/Attainment
Yell CountyUnclassifiable/Attainment
AQCR 017 Metropolitan Fort Smith Interstate:
Benton CountyUnclassifiable/Attainment
Crawford CountyUnclassifiable/Attainment
Sebastian CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
AQCR 018 Metropolitan Memphis Interstate: Crittenden CountyUnclassifiable/Attainment
AQCR 019 Monroe-El Dorado Interstate:
Ashley CountyUnclassifiable/Attainment
Bradley CountyUnclassifiable/Attainment
Calhoun CountyUnclassifiable/Attainment
Nevada CountyUnclassifiable/Attainment
Ouachita CountyUnclassifiable/Attainment
Union CountyUnclassifiable/Attainment
AQCR 020 Northeast Arkansas Intrastate:
Arkansas CountyUnclassifiable/Attainment
Clay CountyUnclassifiable/Attainment
Craighead CountyUnclassifiable/Attainment
Cross CountyUnclassifiable/Attainment
Greene CountyUnclassifiable/Attainment
Independence CountyUnclassifiable/Attainment
Jackson CountyUnclassifiable/Attainment
Lawrence CountyUnclassifiable/Attainment
Lee CountyUnclassifiable/Attainment
Mississippi CountyUnclassifiable/Attainment
Monroe CountyUnclassifiable/Attainment
Phillips CountyUnclassifiable/Attainment
Poinsett CountyUnclassifiable/Attainment
Prairie CountyUnclassifiable/Attainment
Randolph CountyUnclassifiable/Attainment
St. Francis CountyUnclassifiable/Attainment
Sharp CountyUnclassifiable/Attainment
White CountyUnclassifiable/Attainment
Woodruff CountyUnclassifiable/Attainment
AQCR 021 Northwest Arkansas Intrastate:
Baxter CountyUnclassifiable/Attainment
Boone CountyUnclassifiable/Attainment
Carroll CountyUnclassifiable/Attainment
Cleburne CountyUnclassifiable/Attainment
Franklin CountyUnclassifiable/Attainment
Fulton CountyUnclassifiable/Attainment
Izard CountyUnclassifiable/Attainment
Johnson CountyUnclassifiable/Attainment
Logan CountyUnclassifiable/Attainment
Madison CountyUnclassifiable/Attainment
Marion CountyUnclassifiable/Attainment
Montgomery CountyUnclassifiable/Attainment
Newton CountyUnclassifiable/Attainment
Pike CountyUnclassifiable/Attainment
Polk CountyUnclassifiable/Attainment
Scott CountyUnclassifiable/Attainment
Searcy CountyUnclassifiable/Attainment
Stone CountyUnclassifiable/Attainment
Van Buren CountyUnclassifiable/Attainment
AQCR 022 Shreveport-Texarkana-Tyler Interstate:
Columbia CountyUnclassifiable/Attainment
Hempstead CountyUnclassifiable/Attainment
Howard CountyUnclassifiable/Attainment
Lafayette CountyUnclassifiable/Attainment
Little River CountyUnclassifiable/Attainment
Miller CountyUnclassifiable/Attainment
Sevier 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.

Arkansas—1997 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 016 Central Arkansas Intrastate:
Chicot CountyUnclassifiable/Attainment
Clark CountyUnclassifiable/Attainment
Cleveland CountyUnclassifiable/Attainment
Conway CountyUnclassifiable/Attainment
Dallas CountyUnclassifiable/Attainment
Desha CountyUnclassifiable/Attainment
Drew CountyUnclassifiable/Attainment
Faulkner CountyUnclassifiable/Attainment
Garland CountyUnclassifiable/Attainment
Grant CountyUnclassifiable/Attainment
Hot Spring CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Lonoke CountyUnclassifiable/Attainment
Perry CountyUnclassifiable/Attainment
Pope CountyUnclassifiable/Attainment
Pulaski CountyUnclassifiable/Attainment
Saline CountyUnclassifiable/Attainment
Yell CountyUnclassifiable/Attainment
AQCR 017 Metropolitan Fort Smith Interstate:
Benton CountyUnclassifiable/Attainment
Crawford CountyUnclassifiable/Attainment
Sebastian CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
AQCR 019 Monroe-El Dorado Interstate:
Ashley CountyUnclassifiable/Attainment
Bradley CountyUnclassifiable/Attainment
Calhoun CountyUnclassifiable/Attainment
Nevada CountyUnclassifiable/Attainment
Ouachita CountyUnclassifiable/Attainment
Union CountyUnclassifiable/Attainment
AQCR 020 Northeast Arkansas Intrastate:
Arkansas CountyUnclassifiable/Attainment
Clay CountyUnclassifiable/Attainment
Craighead CountyUnclassifiable/Attainment
Cross CountyUnclassifiable/Attainment
Greene CountyUnclassifiable/Attainment
Independence CountyUnclassifiable/Attainment
Jackson CountyUnclassifiable/Attainment
Lawrence CountyUnclassifiable/Attainment
Lee CountyUnclassifiable/Attainment
Mississippi CountyUnclassifiable/Attainment
Monroe CountyUnclassifiable/Attainment
Phillips CountyUnclassifiable/Attainment
Poinsett CountyUnclassifiable/Attainment
Prairie CountyUnclassifiable/Attainment
Randolph CountyUnclassifiable/Attainment
St. Francis CountyUnclassifiable/Attainment
Sharp CountyUnclassifiable/Attainment
White CountyUnclassifiable/Attainment
Woodruff CountyUnclassifiable/Attainment
AQCR 021 Northwest Arkansas Intrastate:
Baxter CountyUnclassifiable/Attainment
Boone CountyUnclassifiable/Attainment
Carroll CountyUnclassifiable/Attainment
Cleburne CountyUnclassifiable/Attainment
Franklin CountyUnclassifiable/Attainment
Fulton CountyUnclassifiable/Attainment
Izard CountyUnclassifiable/Attainment
Johnson CountyUnclassifiable/Attainment
Logan CountyUnclassifiable/Attainment
Madison CountyUnclassifiable/Attainment
Marion CountyUnclassifiable/Attainment
Montgomery CountyUnclassifiable/Attainment
Newton CountyUnclassifiable/Attainment
Pike CountyUnclassifiable/Attainment
Polk CountyUnclassifiable/Attainment
Scott CountyUnclassifiable/Attainment
Searcy CountyUnclassifiable/Attainment
Stone CountyUnclassifiable/Attainment
Van Buren CountyUnclassifiable/Attainment
AQCR 022 Shreveport-Texarkana-Tyler Interstate:
Columbia CountyUnclassifiable/Attainment
Hempstead CountyUnclassifiable/Attainment
Howard CountyUnclassifiable/Attainment
Lafayette CountyUnclassifiable/Attainment
Little River CountyUnclassifiable/Attainment
Miller CountyUnclassifiable/Attainment
Sevier CountyUnclassifiable/Attainment
Memphis, TN-AR: (AQCR 018 Metropolitan Memphis Interstate):
Crittenden 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.

Arkansas—2006 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
AQCR 016 Central Arkansas Intrastate:
Chicot CountyUnclassifiable/Attainment
Clark CountyUnclassifiable/Attainment
Cleveland CountyUnclassifiable/Attainment
Conway CountyUnclassifiable/Attainment
Dallas CountyUnclassifiable/Attainment
Desha CountyUnclassifiable/Attainment
Drew CountyUnclassifiable/Attainment
Faulkner CountyUnclassifiable/Attainment
Garland CountyUnclassifiable/Attainment
Grant CountyUnclassifiable/Attainment
Hot Spring CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Lonoke CountyUnclassifiable/Attainment
Perry CountyUnclassifiable/Attainment
Pope CountyUnclassifiable/Attainment
Pulaski CountyUnclassifiable/Attainment
Saline CountyUnclassifiable/Attainment
Yell CountyUnclassifiable/Attainment
AQCR 017 Metropolitan Fort Smith Interstate:
Benton CountyUnclassifiable/Attainment
Crawford CountyUnclassifiable/Attainment
Sebastian CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
AQCR 019 Monroe-El Dorado Interstate:
Ashley CountyUnclassifiable/Attainment
Bradley CountyUnclassifiable/Attainment
Calhoun CountyUnclassifiable/Attainment
Nevada CountyUnclassifiable/Attainment
Ouachita CountyUnclassifiable/Attainment
Union CountyUnclassifiable/Attainment
AQCR 020 Northeast Arkansas Intrastate:
Arkansas CountyUnclassifiable/Attainment
Clay CountyUnclassifiable/Attainment
Craighead CountyUnclassifiable/Attainment
Cross CountyUnclassifiable/Attainment
Greene CountyUnclassifiable/Attainment
Independence CountyUnclassifiable/Attainment
Jackson CountyUnclassifiable/Attainment
Lawrence CountyUnclassifiable/Attainment
Lee CountyUnclassifiable/Attainment
Mississippi CountyUnclassifiable/Attainment
Monroe CountyUnclassifiable/Attainment
Phillips CountyUnclassifiable/Attainment
Poinsett CountyUnclassifiable/Attainment
Prairie CountyUnclassifiable/Attainment
Randolph CountyUnclassifiable/Attainment
St. Francis CountyUnclassifiable/Attainment
Sharp CountyUnclassifiable/Attainment
White CountyUnclassifiable/Attainment
Woodruff CountyUnclassifiable/Attainment
AQCR 021 Northwest Arkansas Intrastate:
Baxter CountyUnclassifiable/Attainment
Boone CountyUnclassifiable/Attainment
Carroll CountyUnclassifiable/Attainment
Cleburne CountyUnclassifiable/Attainment
Franklin CountyUnclassifiable/Attainment
Fulton CountyUnclassifiable/Attainment
Izard CountyUnclassifiable/Attainment
Johnson CountyUnclassifiable/Attainment
Logan CountyUnclassifiable/Attainment
Madison CountyUnclassifiable/Attainment
Marion CountyUnclassifiable/Attainment
Montgomery CountyUnclassifiable/Attainment
Newton CountyUnclassifiable/Attainment
Pike CountyUnclassifiable/Attainment
Polk CountyUnclassifiable/Attainment
Scott CountyUnclassifiable/Attainment
Searcy CountyUnclassifiable/Attainment
Stone CountyUnclassifiable/Attainment
Van Buren CountyUnclassifiable/Attainment
AQCR 022 Shreveport-Texarkana-Tyler Interstate:
Columbia CountyUnclassifiable/Attainment
Hempstead CountyUnclassifiable/Attainment
Howard CountyUnclassifiable/Attainment
Lafayette CountyUnclassifiable/Attainment
Little River CountyUnclassifiable/Attainment
Miller CountyUnclassifiable/Attainment
Sevier CountyUnclassifiable/Attainment
Memphis, TN-AR: (AQCR 018 Metropolitan Memphis Interstate):
Crittenden 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.

Arkansas—NO2 (1971 Annual Standard)

Designated area Does not meet primary standards Cannot be classified or better than national standards
AQCR 016X
AQCR 017X
AQCR 018X
AQCR 019X
AQCR 020X
AQCR 021X
AQCR 022X

Arkansas—NO2 (2010 1-Hour Standard)

Designated area Designation a
Date 1 Type
Ashley CountyUnclassifiable/Attainment.
Arkansas CountyUnclassifiable/Attainment.
Baxter CountyUnclassifiable/Attainment.
Benton CountyUnclassifiable/Attainment.
Boone CountyUnclassifiable/Attainment.
Bradley CountyUnclassifiable/Attainment.
Calhoun CountyUnclassifiable/Attainment.
Carroll CountyUnclassifiable/Attainment.
Chicot CountyUnclassifiable/Attainment.
Clark CountyUnclassifiable/Attainment.
Clay CountyUnclassifiable/Attainment.
Cleburne CountyUnclassifiable/Attainment.
Cleveland CountyUnclassifiable/Attainment.
Columbia CountyUnclassifiable/Attainment.
Conway CountyUnclassifiable/Attainment.
Craighead CountyUnclassifiable/Attainment.
Crawford CountyUnclassifiable/Attainment.
Crittenden CountyUnclassifiable/Attainment.
Cross CountyUnclassifiable/Attainment.
Dallas CountyUnclassifiable/Attainment.
Desha CountyUnclassifiable/Attainment.
Drew CountyUnclassifiable/Attainment.
Faulkner CountyUnclassifiable/Attainment.
Franklin CountyUnclassifiable/Attainment.
Fulton CountyUnclassifiable/Attainment.
Garland County.Unclassifiable/Attainment.
Grant CountyUnclassifiable/Attainment.
Greene CountyUnclassifiable/Attainment.
Hempstead CountyUnclassifiable/Attainment.
Hot Spring CountyUnclassifiable/Attainment.
Howard County.Unclassifiable/Attainment.
Independence CountyUnclassifiable/Attainment.
Izard CountUnclassifiable/Attainment.
Jackson CountyUnclassifiable/Attainment.
Jefferson County.Unclassifiable/Attainment.
Johnson CountyUnclassifiable/Attainment.
Lafayette CountyUnclassifiable/Attainment.
Lawrence CountyUnclassifiable/Attainment.
Lee CountyUnclassifiable/Attainment.
Lincoln CountyUnclassifiable/Attainment.
Little River CountyUnclassifiable/Attainment.
Logan CountyUnclassifiable/Attainment.
Lonoke CountyUnclassifiable/Attainment.
Madison CountyUnclassifiable/Attainment.
Marion CountyUnclassifiable/Attainment.
Miller CountyUnclassifiable/Attainment.
Mississippi CountyUnclassifiable/Attainment.
Monroe CountyUnclassifiable/Attainment.
Montgomery CountyUnclassifiable/Attainment.
Nevada CountyUnclassifiable/Attainment.
Newton CountyUnclassifiable/Attainment.
Ouachita CountyUnclassifiable/Attainment.
Perry CountyUnclassifiable/Attainment.
Phillips CountyUnclassifiable/Attainment.
Pike CountyUnclassifiable/Attainment.
Poinsett CountyUnclassifiable/Attainment.
Polk CountyUnclassifiable/Attainment.
Pope CountyUnclassifiable/Attainment.
Prairie CountyUnclassifiable/Attainment.
Pulaski CountyUnclassifiable/Attainment.
Randolph CountyUnclassifiable/Attainment.
St. Francis CountyUnclassifiable/Attainment.
Saline CountyUnclassifiable/Attainment.
Scott CountyUnclassifiable/Attainment.
Searcy CountyUnclassifiable/Attainment.
Sebastian CountyUnclassifiable/Attainment
Sevier CountyUnclassifiable/Attainment.
Sharp CountyUnclassifiable/Attainment.
Stone CountyUnclassifiable/Attainment.
Union CountyUnclassifiable/Attainment.
Van Buren CountyUnclassifiable/Attainment.
Washington CountyUnclassifiable/Attainment.
White CountyUnclassifiable/Attainment.
Woodruff CountyUnclassifiable/Attainment.
Yell 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.

Arkansas—1997 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area Designation a Category/classification
Date 1 Type Date 1 Type
Memphis TN-AR: (AQCR Metropolitan Memphis Interstate) Crittenden CountyAttainment( 2)
AQCR 016 Central Arkansas Intrastate (part)Unclassifiable/Attainment
Pulaski County
AQCR 016 Central Arkansas Intrastate (remainder of)Unclassifiable/Attainment
Chicot County
Clark County
Cleveland County
Conway County
Dallas County
Desha County
Drew County
Faulkner County
Garland County
Grant County
Hot Spring County
Jefferson County
Lincoln County
Lonoke County
Perry County
Pope County
Saline County
Yell County
AQCR 017 Metropolitan Fort Smith InterstateUnclassifiable/Attainment
Benton County
Crawford County
Sebastian County
Washington County
AQCR 019 Monroe-El Dorado InterstateUnclassifiable/Attainment
Ashley County
Bradley County
Calhoun County
Nevada County
Ouachita County
Union County
AQCR 020 Northeast Arkansas IntrastateUnclassifiable/Attainment
Arkansas County
Clay County
Craighead County
Cross County
Greene County
Independence County
Jackson County
Lawrence County
Lee County
Mississippi County
Monroe County
Phillips County
Poinsett County
Prairie County
Randolph County
St. Francis County
Sharp County
White County
Woodruff County
AQCR 021 Northwest Arkansas IntrastateUnclassifiable/Attainment
Baxter County
Boone County
Carroll County
Cleburne County
Franklin County
Fulton County
Izard County
Johnson County
Logan County
Madison County
Marion County
Montgomery County
Newton County
Pike County
Polk County
Scott County
Searcy County
Stone County
Van Buren County
AQCR 022 Shreveport-Texarkana-Tyler Interstate.Unclassifiable/Attainment
Columbia County
Hempstead County
Howard County
Lafayette County
Little River County
Miller County
Sevier 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.

2 Effective April 23, 2010.

Arkansas—2008 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area Designation Classification
Date 1 Type Date 1 Type
Memphis, TN-MS-AR 2 Crittenden County4/25/2016Attainment
Rest of State: 3
Ashley CountyUnclassifiable/Attainment
Arkansas CountyUnclassifiable/Attainment
Baxter CountyUnclassifiable/Attainment
Benton CountyUnclassifiable/Attainment
Boone CountyUnclassifiable/Attainment
Bradley CountyUnclassifiable/Attainment
Calhoun CountyUnclassifiable/Attainment
Carroll CountyUnclassifiable/Attainment
Chicot CountyUnclassifiable/Attainment
Clark CountyUnclassifiable/Attainment
Clay CountyUnclassifiable/Attainment
Cleburne CountyUnclassifiable/Attainment
Cleveland CountyUnclassifiable/Attainment
Columbia CountyUnclassifiable/Attainment
Conway CountyUnclassifiable/Attainment
Craighead CountyUnclassifiable/Attainment
Crawford CountyUnclassifiable/Attainment
Cross CountyUnclassifiable/Attainment
Dallas CountyUnclassifiable/Attainment
Desha CountyUnclassifiable/Attainment
Drew CountyUnclassifiable/Attainment
Faulkner CountyUnclassifiable/Attainment
Franklin CountyUnclassifiable/Attainment
Fulton CountyUnclassifiable/Attainment
Garland CountyUnclassifiable/Attainment
Grant CountyUnclassifiable/Attainment
Greene CountyUnclassifiable/Attainment
Hempstead CountyUnclassifiable/Attainment
Hot Spring CountyUnclassifiable/Attainment
Howard CountyUnclassifiable/Attainment
Independence CountyUnclassifiable/Attainment
Izard CountyUnclassifiable/Attainment
Jackson CountyUnclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Johnson CountyUnclassifiable/Attainment
Lafayette CountyUnclassifiable/Attainment
Lawrence CountyUnclassifiable/Attainment
Lee CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Little River CountyUnclassifiable/Attainment
Logan CountyUnclassifiable/Attainment
Lonoke CountyUnclassifiable/Attainment
Madison CountyUnclassifiable/Attainment
Marion CountyUnclassifiable/Attainment
Miller CountyUnclassifiable/Attainment
Mississippi CountyUnclassifiable/Attainment
Monroe CountyUnclassifiable/Attainment
Montgomery CountyUnclassifiable/Attainment
Nevada CountyUnclassifiable/Attainment
Newton CountyUnclassifiable/Attainment
Ouachita CountyUnclassifiable/Attainment
Perry CountyUnclassifiable/Attainment
Phillips CountyUnclassifiable/Attainment
Pike CountyUnclassifiable/Attainment
Poinsett CountyUnclassifiable/Attainment
Polk CountyUnclassifiable/Attainment
Pope CountyUnclassifiable/Attainment
Prairie CountyUnclassifiable/Attainment
Pulaski CountyUnclassifiable/Attainment
Randolph CountyUnclassifiable/Attainment
St. Francis CountyUnclassifiable/Attainment
Saline CountyUnclassifiable/Attainment
Scott CountyUnclassifiable/Attainment
Searcy CountyUnclassifiable/Attainment
Sebastian CountyUnclassifiable/Attainment
Sevier CountyUnclassifiable/Attainment
Sharp CountyUnclassifiable/Attainment
Stone CountyUnclassifiable/Attainment
Union CountyUnclassifiable/Attainment
Van Buren CountyUnclassifiable/Attainment
Washington CountyUnclassifiable/Attainment
White CountyUnclassifiable/Attainment
Woodruff CountyUnclassifiable/Attainment
Yell CountyUnclassifiable/Attainment

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

2 Excludes Indian country located in each area, unless otherwise noted.

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

Arkansas—2015 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area 1 Designation Classification
Date 2 Type Date Type
Arkansas CountyAttainment/Unclassifiable
Ashley CountyAttainment/Unclassifiable
Baxter CountyAttainment/Unclassifiable
Benton CountyAttainment/Unclassifiable
Boone CountyAttainment/Unclassifiable
Bradley CountyAttainment/Unclassifiable
Calhoun CountyAttainment/Unclassifiable
Carroll CountyAttainment/Unclassifiable
Chicot CountyAttainment/Unclassifiable
Clark CountyAttainment/Unclassifiable
Clay CountyAttainment/Unclassifiable
Cleburne CountyAttainment/Unclassifiable
Cleveland CountyAttainment/Unclassifiable
Columbia CountyAttainment/Unclassifiable
Conway CountyAttainment/Unclassifiable
Craighead CountyAttainment/Unclassifiable
Crawford CountyAttainment/Unclassifiable
Crittenden CountyAttainment/Unclassifiable
Cross CountyAttainment/Unclassifiable
Dallas CountyAttainment/Unclassifiable
Desha CountyAttainment/Unclassifiable
Drew CountyAttainment/Unclassifiable
Faulkner CountyAttainment/Unclassifiable
Franklin CountyAttainment/Unclassifiable
Fulton CountyAttainment/Unclassifiable
Garland CountyAttainment/Unclassifiable
Grant CountyAttainment/Unclassifiable
Greene CountyAttainment/Unclassifiable
Hempstead CountyAttainment/Unclassifiable
Hot Spring CountyAttainment/Unclassifiable
Howard CountyAttainment/Unclassifiable
Independence CountyAttainment/Unclassifiable
Izard CountyAttainment/Unclassifiable
Jackson CountyAttainment/Unclassifiable
Jefferson CountyAttainment/Unclassifiable
Johnson CountyAttainment/Unclassifiable
Lafayette CountyAttainment/Unclassifiable
Lawrence CountyAttainment/Unclassifiable
Lee CountyAttainment/Unclassifiable
Lincoln CountyAttainment/Unclassifiable
Little River CountyAttainment/Unclassifiable
Logan CountyAttainment/Unclassifiable
Lonoke CountyAttainment/Unclassifiable
Madison CountyAttainment/Unclassifiable
Marion CountyAttainment/Unclassifiable
Miller CountyAttainment/Unclassifiable
Mississippi CountyAttainment/Unclassifiable
Monroe CountyAttainment/Unclassifiable
Montgomery CountyAttainment/Unclassifiable
Nevada CountyAttainment/Unclassifiable
Newton CountyAttainment/Unclassifiable
Ouachita CountyAttainment/Unclassifiable
Perry CountyAttainment/Unclassifiable
Phillips CountyAttainment/Unclassifiable
Pike CountyAttainment/Unclassifiable
Poinsett CountyAttainment/Unclassifiable
Polk CountyAttainment/Unclassifiable
Pope CountyAttainment/Unclassifiable
Prairie CountyAttainment/Unclassifiable
Pulaski CountyAttainment/Unclassifiable
Randolph CountyAttainment/Unclassifiable
St. Francis CountyAttainment/Unclassifiable
Saline CountyAttainment/Unclassifiable
Scott CountyAttainment/Unclassifiable
Searcy CountyAttainment/Unclassifiable
Sebastian CountyAttainment/Unclassifiable
Sevier CountyAttainment/Unclassifiable
Sharp CountyAttainment/Unclassifiable
Stone CountyAttainment/Unclassifiable
Union CountyAttainment/Unclassifiable
Van Buren CountyAttainment/Unclassifiable
Washington CountyAttainment/Unclassifiable
White CountyAttainment/Unclassifiable
Woodruff CountyAttainment/Unclassifiable
Yell 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 January 16, 2018, unless otherwise noted.

Arkansas—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 § 81.304, 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 81.304
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