1. Regulations
  2. title 40
  3. chapter I-i19
  4. part 81
  5. subpart C
  6. § 81.304

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 1Designation Date 2Type 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 County4/12/19Attainment/Unclassifiable. Izard CountyAttainment/Unclassifiable. Jackson CountyAttainment/Unclassifiable. Jefferson County9/12/16Attainment/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 1Type Date 1Type 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 1Type Date 1Type 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 aClassification Date 1Type 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 1Designation Classification Date 2Type Date 2Type 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 aClassification Date 1Type 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 aClassification Date 1Type 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 aDate 1Type 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 aCategory/classification Date 1Type Date 1Type 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 1Type Date 1Type Memphis, TN-MS-AR 2 Crittenden County4/25/2016Attainment Rest of State: 3Ashley 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 1Designation Classification Date 2Type 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 aDate 1Type 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