1. Regulations
  2. title 40
  3. chapter I-i19
  4. part 81
  5. subpart C
  6. § 81.316

View all text of Subpart C [§ 81.300 - § 81.356]

§ 81.316 - Iowa.

Iowa—TSP

Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards Central portion of WaterlooX Cedar Falls TownshipX East Waterloo TownshipX Remainder of Black Hawk CountyX Mason City—A portion of Cerro Gordo County contained entirely within sections 27, 28, 29, 32, 33, 34 and 35 of T97N R20W and sections 2, 3, 4 and 5 of T96N R20WX Mason City—two separate portions of Cerro Gordo County contained entirely within sections 13, 24 and 25 of T97N R21W; sections 18, 19, 20, 21, 30, 31 and 35 of T97N R20W; and sections 1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 15, 16 and 17 of T96N R20WX Falls TownshipX Lake TownshipX Lincoln TownshipX Remainder of Cerro Gordo CountyX An area around downtown ClintonX Comanche TownshipX Remainder of Clinton CountyX Burlington TownshipX Remainder of Des Moines CountyX Iowa City TownshipX Remainder of Johnson CountyX An area in and near KeokukX Jackson TownshipX Jefferson TownshipX Madison TownshipX Remainder of Lee CountyX Cedar Rapids—a portion of Linn County contained entirely within T 82 N., R 7 W.; and T 83 N., R 7 WX Bertram TownshipX Clinton TownshipX College TownshipX Fairfax TownshipX Marion TownshipX Monroe TownshipX Putnam TownshipX Remainder of Linn CountyX The central portion of MarshalltownX Remainder of Marshall CountyX The central and southern portions of MuscatineX Fruitland TownshipX Sweetland TownshipX Montpelier TownshipX Remainder of Muscatine CountyX An area of central Des Moines east of U.S. Highway 65 & 69 (E. 14th Street)X Portions of Polk County contained entirely within T 78 N. R 23 W.; T 78 N. R 24 W.; T 78 N. R 25 W.; T 80 R 24 W.; T 79 N. R 23 W.; T 79 N. R 24 W.; and T 79 R 25 WX Clay TownshipX Douglas TownshipX Jefferson TownshipX Remainder of Polk CountyX The western portion of Council Bluffs and Carter LakeX Lake TownshipX Lewis TownshipX Remainder of Pottawatomie CountyX Portions of Buffalo, Davenport, Bettendorf and RiverdaleX Remainder of Scott CountyX Center TownshipX Remainder of Wapello CountyX The central portion Ft. DodgeX Otho TownshipX Remainder of Webster CountyX The central and southern portions of Sioux CityX Liberty TownshipX Woodbury TownshipX Remainder of Woodbury CountyX Remainder of StateX

1 EPA designation replaces State designation.

Iowa—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 Entire stateX

Iowa—2010 Sulfur Dioxide NAAQS

[Primary]

Designated area 1Designation Date 2Type Muscatine, IA10/4/13Nonattainment. Muscatine County (part) Sections 1-3, 10-15, 22-27, 34-36 of T77N, R3W (Lake Township) Sections 1-3, 10-15, 22-27, 34-36 of T76N, R3W (Seventy-six Township) T77N, R2W (Bloomington Township) T76N, R2W (Fruitland Township) All sections except 1, 12, 13, 24, 25, 36 of T77N, R1W (Sweetland Township) Linn County, IAUnclassifiable. Linn County Woodbury County, IA9/12/16Unclassifiable. Woodbury County Des Moines County, IA9/12/16Attainment/Unclassifiable. Des Moines County Louisa County, IAAttainment/Unclassifiable. Louisa County Pottawattamie County, IAAttainment/Unclassifiable. Pottawattamie County Wapello County, IA9/12/16Attainment/Unclassifiable. Wapello County Statewide:Attainment/Unclassifiable. Adair County Adams County Allamakee County Appanoose County Audubon County Benton County Black Hawk County Boone County Bremer County Buchanan County Buena Vista County Butler County Calhoun County Carroll County Cass County Cedar County Cerro Gordo County Cherokee County Chickasaw County Clarke County Clay County Clayton County Clinton County Crawford County Dallas County Davis County Decatur County Delaware County Dickinson County Dubuque County Emmet County Fayette County Floyd County Franklin County Fremont County Greene County Grundy County Guthrie County Hamilton County Hancock County Hardin County Harrison County Henry County Howard County Humboldt County Ida County Iowa County Jackson County Jasper County Jefferson County Johnson County Jones County Keokuk County Kossuth County Lee County Lucas County Lyon County Madison County Mahaska County Marion County Marshall County Mills County Mitchell County Monona County Monroe County Montgomery County Muscatine County (portion of Muscatine County not designated Nonattainment on 10/4/13) O'Brien County Osceola County Page County Palo Alto County Plymouth County Pocahontas County Polk County Poweshiek County Ringgold County Sac County Scott County Shelby County Sioux County Story County Tama County Taylor County Union County Van Buren County Warren County Washington County Wayne County Webster County Winnebago County Winneshiek County Worth County Wright County

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

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

Iowa—Carbon Monoxide

Designated Area Designation Classification Date 1Type Date 1Type StatewideUnclassifiable/Attainment Adair County Adams County Allamakee County Appanoose County Audubon County Benton County Black Hawk County Boone County Bremer County Buchanan County Buena Vista County Butler County Calhoun County Carroll County Cass County Cedar County Cerro Gordo County Cherokee County Chickasaw County Clarke County Clay County Clayton County Clinton County Crawford County Dallas County Davis County Decatur County Delaware County Des Moines County Dickinson County Dubuque County Emmet County Fayette County Floyd County Franklin County Fremont County Greene County Grundy County Guthrie County Hamilton County Hancock County Hardin County Harrison County Henry County Howard County Humboldt County Ida County Iowa County Jackson County Jasper County Jefferson County Johnson County Jones County Keokuk County Kossuth County Lee County Linn County Louisa County Lucas County Lyon County Madison County Mahaska County Marion County Marshall County Mills County Mitchell County Monona County Monroe County Montgomery County Muscatine County O'Brien County Osceola County Page County Palo Alto County Plymouth County Pocahontas County Polk County Pottawattamie County Poweshiek County Ringgold County Sac County Scott County Shelby County Sioux County Story County Tama County Taylor County Union County Van Buren County Wapello County Warren County Washington County Wayne County Webster County Winnebago County Winneshiek County Woodbury County Worth County Wright County

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

Iowa—Ozone (1-Hour Standard) 2

Designated area Designation Classification Date 1Type Date 1Type StatewideUnclassifiable/Attainment Adair County Adams County Allamakee County Appanoose County Audubon County Benton County Black Hawk County Boone County Bremer County Buchanan County Buena Vista County Butler County Calhoun County Carroll County Cass County Cedar County Cerro Gordo County Cherokee County Chickasaw County Clarke County Clay County Clayton County Clinton County Crawford County Dallas County Davis County Decatur County Delaware County Des Moines County Dickinson County Dubuque County Emmet County Fayette County Floyd County Franklin County Fremont County Greene County Grundy County Guthrie County Hamilton County Hancock County Hardin County Harrison County Henry County Howard County Humboldt County Ida County Iowa County Jackson County Jasper County Jefferson County Johnson County Jones County Keokuk County Kossuth County Lee County Linn County Louisa County Lucas County Lyon County Madison County Mahaska County Marion County Marshall County Mills County Mitchell County Monona County Monroe County Montgomery County Muscatine County O'Brien County Osceola County Page County Palo Alto County Plymouth County Pocahontas County Polk County Pottawattamie County Poweshiek County Ringgold County Sac County Scott County Shelby County Sioux County Story County Tama County Taylor County Union County Van Buren County Wapello County Warren County Washington County Wayne County Webster County Winnebago County Winneshiek County Woodbury County Worth County Wright 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 Iowa.

Iowa—1997 Annual PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation aClassification Date 1Type Date Type Statewide: Adair CountyUnclassifiable/Attainment. Adams CountyUnclassifiable/Attainment. Allamakee CountyUnclassifiable/Attainment. Appanoose CountyUnclassifiable/Attainment. Audubon CountyUnclassifiable/Attainment. Benton CountyUnclassifiable/Attainment. Black Hawk CountyUnclassifiable/Attainment. Boone CountyUnclassifiable/Attainment. Bremer CountyUnclassifiable/Attainment. Buchanan CountyUnclassifiable/Attainment. Buena Vista CountyUnclassifiable/Attainment. Butler CountyUnclassifiable/Attainment. Calhoun CountyUnclassifiable/Attainment. Carroll CountyUnclassifiable/Attainment. Cass CountyUnclassifiable/Attainment. Cedar CountyUnclassifiable/Attainment. Cerro Gordo CountyUnclassifiable/Attainment. Cherokee CountyUnclassifiable/Attainment. Chickasaw CountyUnclassifiable/Attainment. Clarke CountyUnclassifiable/Attainment. Clay CountyUnclassifiable/Attainment. Clayton CountyUnclassifiable/Attainment. Clinton CountyUnclassifiable/Attainment. Crawford CountyUnclassifiable/Attainment. Dallas CountyUnclassifiable/Attainment. Davis CountyUnclassifiable/Attainment. Decatur CountyUnclassifiable/Attainment. Delaware CountyUnclassifiable/Attainment. Des Moines CountyUnclassifiable/Attainment. Dickinson CountyUnclassifiable/Attainment. Dubuque CountyUnclassifiable/Attainment. Emmet CountyUnclassifiable/Attainment. Fayette CountyUnclassifiable/Attainment. Floyd CountyUnclassifiable/Attainment. Franklin CountyUnclassifiable/Attainment. Fremont CountyUnclassifiable/Attainment. Greene CountyUnclassifiable/Attainment. Grundy CountyUnclassifiable/Attainment. Guthrie CountyUnclassifiable/Attainment. Hamilton CountyUnclassifiable/Attainment. Hancock CountyUnclassifiable/Attainment. Hardin CountyUnclassifiable/Attainment. Harrison CountyUnclassifiable/Attainment. Henry CountyUnclassifiable/Attainment. Howard CountyUnclassifiable/Attainment. Humboldt CountyUnclassifiable/Attainment. Ida CountyUnclassifiable/Attainment. Iowa CountyUnclassifiable/Attainment. Jackson CountyUnclassifiable/Attainment. Jasper CountyUnclassifiable/Attainment. Jefferson CountyUnclassifiable/Attainment. Johnson CountyUnclassifiable/Attainment. Jones CountyUnclassifiable/Attainment. Keokuk CountyUnclassifiable/Attainment. Kossuth CountyUnclassifiable/Attainment. Lee CountyUnclassifiable/Attainment. Linn CountyUnclassifiable/Attainment. Louisa CountyUnclassifiable/Attainment. Lucas CountyUnclassifiable/Attainment. Lyon CountyUnclassifiable/Attainment. Madison CountyUnclassifiable/Attainment. Mahaska CountyUnclassifiable/Attainment. Marion CountyUnclassifiable/Attainment. Marshall CountyUnclassifiable/Attainment. Mills CountyUnclassifiable/Attainment. Mitchell CountyUnclassifiable/Attainment. Monona CountyUnclassifiable/Attainment. Monroe CountyUnclassifiable/Attainment. Montgomery CountyUnclassifiable/Attainment. Muscatine CountyUnclassifiable/Attainment. O'Brien CountyUnclassifiable/Attainment. Osceola CountyUnclassifiable/Attainment. Page CountyUnclassifiable/Attainment. Palo Alto CountyUnclassifiable/Attainment. Plymouth CountyUnclassifiable/Attainment. Pocahontas CountyUnclassifiable/Attainment. Polk CountyUnclassifiable/Attainment. Pottawattamie CountyUnclassifiable/Attainment. Poweshiek CountyUnclassifiable/Attainment. Ringgold CountyUnclassifiable/Attainment. Sac CountyUnclassifiable/Attainment. Scott CountyUnclassifiable/Attainment. Shelby CountyUnclassifiable/Attainment. Sioux CountyUnclassifiable/Attainment. Story CountyUnclassifiable/Attainment. Tama CountyUnclassifiable/Attainment. Taylor CountyUnclassifiable/Attainment. Union CountyUnclassifiable/Attainment. Van Buren CountyUnclassifiable/Attainment. Wapello CountyUnclassifiable/Attainment. Warren CountyUnclassifiable/Attainment. Washington CountyUnclassifiable/Attainment. Wayne CountyUnclassifiable/Attainment. Webster CountyUnclassifiable/Attainment. Winnebago CountyUnclassifiable/Attainment. Winneshiek CountyUnclassifiable/Attainment. Woodbury CountyUnclassifiable/Attainment. Worth CountyUnclassifiable/Attainment. Wright 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.

Iowa—2012 Annual PM2.5 NAAQS

[Primary]

Designated area 1Designation Classification Date 2Type Date 2Type Statewide: Adair CountyUnclassifiable/Attainment Adams CountyUnclassifiable/Attainment Allamakee CountyUnclassifiable/Attainment Appanoose CountyUnclassifiable/Attainment Audubon CountyUnclassifiable/Attainment Benton CountyUnclassifiable/Attainment Black Hawk CountyUnclassifiable/Attainment Boone CountyUnclassifiable/Attainment Bremer CountyUnclassifiable/Attainment Buchanan CountyUnclassifiable/Attainment Buena Vista CountyUnclassifiable/Attainment Butler CountyUnclassifiable/Attainment Calhoun CountyUnclassifiable/Attainment Carroll CountyUnclassifiable/Attainment Cass CountyUnclassifiable/Attainment Cedar CountyUnclassifiable/Attainment Cerro Gordo CountyUnclassifiable/Attainment Cherokee CountyUnclassifiable/Attainment Chickasaw CountyUnclassifiable/Attainment Clarke CountyUnclassifiable/Attainment Clay CountyUnclassifiable/Attainment Clayton CountyUnclassifiable/Attainment Clinton CountyUnclassifiable/Attainment Crawford CountyUnclassifiable/Attainment Dallas CountyUnclassifiable/Attainment Davis CountyUnclassifiable/Attainment Decatur CountyUnclassifiable/Attainment Delaware CountyUnclassifiable/Attainment Des Moines CountyUnclassifiable/Attainment Dickinson CountyUnclassifiable/Attainment Dubuque CountyUnclassifiable/Attainment Emmet CountyUnclassifiable/Attainment Fayette CountyUnclassifiable/Attainment Floyd CountyUnclassifiable/Attainment Franklin CountyUnclassifiable/Attainment Fremont CountyUnclassifiable/Attainment Greene CountyUnclassifiable/Attainment Grundy CountyUnclassifiable/Attainment Guthrie CountyUnclassifiable/Attainment Hamilton CountyUnclassifiable/Attainment Hancock CountyUnclassifiable/Attainment Hardin CountyUnclassifiable/Attainment Harrison CountyUnclassifiable/Attainment Henry CountyUnclassifiable/Attainment Howard CountyUnclassifiable/Attainment Humboldt CountyUnclassifiable/Attainment Ida CountyUnclassifiable/Attainment Iowa CountyUnclassifiable/Attainment Jackson CountyUnclassifiable/Attainment Jasper CountyUnclassifiable/Attainment Jefferson CountyUnclassifiable/Attainment Johnson CountyUnclassifiable/Attainment Jones CountyUnclassifiable/Attainment Keokuk CountyUnclassifiable/Attainment Kossuth CountyUnclassifiable/Attainment Lee CountyUnclassifiable/Attainment Linn CountyUnclassifiable/Attainment Louisa CountyUnclassifiable/Attainment Lucas CountyUnclassifiable/Attainment Lyon CountyUnclassifiable/Attainment Madison CountyUnclassifiable/Attainment Mahaska CountyUnclassifiable/Attainment Marion CountyUnclassifiable/Attainment Marshall CountyUnclassifiable/Attainment Mills CountyUnclassifiable/Attainment Mitchell CountyUnclassifiable/Attainment Monona CountyUnclassifiable/Attainment Monroe CountyUnclassifiable/Attainment Montgomery CountyUnclassifiable/Attainment Muscatine CountyUnclassifiable/Attainment O'Brien CountyUnclassifiable/Attainment Osceola CountyUnclassifiable/Attainment Page CountyUnclassifiable/Attainment Palo Alto CountyUnclassifiable/Attainment Plymouth CountyUnclassifiable/Attainment Pocahontas CountyUnclassifiable/Attainment Polk CountyUnclassifiable/Attainment Pottawattamie CountyUnclassifiable/Attainment Poweshiek CountyUnclassifiable/Attainment Ringgold CountyUnclassifiable/Attainment Sac CountyUnclassifiable/Attainment Scott CountyUnclassifiable/Attainment Shelby CountyUnclassifiable/Attainment Sioux CountyUnclassifiable/Attainment Story CountyUnclassifiable/Attainment Tama CountyUnclassifiable/Attainment Taylor CountyUnclassifiable/Attainment Union CountyUnclassifiable/Attainment Van Buren CountyUnclassifiable/Attainment Wapello CountyUnclassifiable/Attainment Warren CountyUnclassifiable/Attainment Washington CountyUnclassifiable/Attainment Wayne CountyUnclassifiable/Attainment Webster CountyUnclassifiable/Attainment Winnebago CountyUnclassifiable/Attainment Winneshiek CountyUnclassifiable/Attainment Woodbury CountyUnclassifiable/Attainment Worth CountyUnclassifiable/Attainment Wright 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.

Iowa—1997 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation aClassification Date 1Type Date Type Statewide: Adair CountyUnclassifiable/Attainment Adams CountyUnclassifiable/Attainment Allamakee CountyUnclassifiable/Attainment Appanoose CountyUnclassifiable/Attainment Audubon CountyUnclassifiable/Attainment Benton CountyUnclassifiable/Attainment Black Hawk CountyUnclassifiable/Attainment Boone CountyUnclassifiable/Attainment Bremer CountyUnclassifiable/Attainment Buchanan CountyUnclassifiable/Attainment Buena Vista CountyUnclassifiable/Attainment Butler CountyUnclassifiable/Attainment Calhoun CountyUnclassifiable/Attainment Carroll CountyUnclassifiable/Attainment Cass CountyUnclassifiable/Attainment Cedar CountyUnclassifiable/Attainment Cerro Gordo CountyUnclassifiable/Attainment Cherokee CountyUnclassifiable/Attainment Chickasaw CountyUnclassifiable/Attainment Clarke CountyUnclassifiable/Attainment Clay CountyUnclassifiable/Attainment Clayton CountyUnclassifiable/Attainment Clinton CountyUnclassifiable/Attainment Crawford CountyUnclassifiable/Attainment Dallas CountyUnclassifiable/Attainment Davis CountyUnclassifiable/Attainment Decatur CountyUnclassifiable/Attainment Delaware CountyUnclassifiable/Attainment Des Moines CountyUnclassifiable/Attainment Dickinson CountyUnclassifiable/Attainment Dubuque CountyUnclassifiable/Attainment Emmet CountyUnclassifiable/Attainment Fayette CountyUnclassifiable/Attainment Floyd CountyUnclassifiable/Attainment Franklin CountyUnclassifiable/Attainment Fremont CountyUnclassifiable/Attainment Greene CountyUnclassifiable/Attainment Grundy CountyUnclassifiable/Attainment Guthrie CountyUnclassifiable/Attainment Hamilton CountyUnclassifiable/Attainment Hancock CountyUnclassifiable/Attainment Hardin CountyUnclassifiable/Attainment Harrison CountyUnclassifiable/Attainment Henry CountyUnclassifiable/Attainment Howard CountyUnclassifiable/Attainment Humboldt CountyUnclassifiable/Attainment Ida CountyUnclassifiable/Attainment Iowa CountyUnclassifiable/Attainment Jackson CountyUnclassifiable/Attainment Jasper CountyUnclassifiable/Attainment Jefferson CountyUnclassifiable/Attainment Johnson CountyUnclassifiable/Attainment Jones CountyUnclassifiable/Attainment Keokuk CountyUnclassifiable/Attainment Kossuth CountyUnclassifiable/Attainment Lee CountyUnclassifiable/Attainment Linn CountyUnclassifiable/Attainment Louisa CountyUnclassifiable/Attainment Lucas CountyUnclassifiable/Attainment Lyon CountyUnclassifiable/Attainment Madison CountyUnclassifiable/Attainment Mahaska CountyUnclassifiable/Attainment Marion CountyUnclassifiable/Attainment Marshall CountyUnclassifiable/Attainment Mills CountyUnclassifiable/Attainment Mitchell CountyUnclassifiable/Attainment Monona CountyUnclassifiable/Attainment Monroe CountyUnclassifiable/Attainment Montgomery CountyUnclassifiable/Attainment Muscatine CountyUnclassifiable/Attainment O'Brien CountyUnclassifiable/Attainment Osceola CountyUnclassifiable/Attainment Page CountyUnclassifiable/Attainment Palo Alto CountyUnclassifiable/Attainment Plymouth CountyUnclassifiable/Attainment Pocahontas CountyUnclassifiable/Attainment Polk CountyUnclassifiable/Attainment Pottawattamie CountyUnclassifiable/Attainment Poweshiek CountyUnclassifiable/Attainment Ringgold CountyUnclassifiable/Attainment Sac CountyUnclassifiable/Attainment Scott CountyUnclassifiable/Attainment Shelby CountyUnclassifiable/Attainment Sioux CountyUnclassifiable/Attainment Story CountyUnclassifiable/Attainment Tama CountyUnclassifiable/Attainment Taylor CountyUnclassifiable/Attainment Union CountyUnclassifiable/Attainment Van Buren CountyUnclassifiable/Attainment Wapello CountyUnclassifiable/Attainment Warren CountyUnclassifiable/Attainment Washington CountyUnclassifiable/Attainment Wayne CountyUnclassifiable/Attainment Webster CountyUnclassifiable/Attainment Winnebago CountyUnclassifiable/Attainment Winneshiek CountyUnclassifiable/Attainment Woodbury CountyUnclassifiable/Attainment Worth CountyUnclassifiable/Attainment Wright 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.

Iowa—2006 24-Hour PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation aClassification Date 1Type Date Type Statewide: Adair CountyUnclassifiable/Attainment. Adams CountyUnclassifiable/Attainment Allamakee CountyUnclassifiable/Attainment Appanoose CountyUnclassifiable/Attainment Audubon CountyUnclassifiable/Attainment Benton CountyUnclassifiable/Attainment Black Hawk CountyUnclassifiable/Attainment Boone CountyUnclassifiable/Attainment Bremer CountyUnclassifiable/Attainment Buchanan CountyUnclassifiable/Attainment Buena Vista CountyUnclassifiable/Attainment Butler CountyUnclassifiable/Attainment Calhoun CountyUnclassifiable/Attainment Carroll CountyUnclassifiable/Attainment Cass CountyUnclassifiable/Attainment Cedar CountyUnclassifiable/Attainment Cerro Gordo CountyUnclassifiable/Attainment Cherokee CountyUnclassifiable/Attainment Chickasaw CountyUnclassifiable/Attainment Clarke CountyUnclassifiable/Attainment Clay CountyUnclassifiable/Attainment Clayton CountyUnclassifiable/Attainment Clinton CountyUnclassifiable/Attainment Crawford CountyUnclassifiable/Attainment Dallas CountyUnclassifiable/Attainment Davis CountyUnclassifiable/Attainment Decatur CountyUnclassifiable/Attainment Delaware CountyUnclassifiable/Attainment Des Moines CountyUnclassifiable/Attainment Dickinson CountyUnclassifiable/Attainment Dubuque CountyUnclassifiable/Attainment Emmet CountyUnclassifiable/Attainment Fayette CountyUnclassifiable/Attainment Floyd CountyUnclassifiable/Attainment Franklin CountyUnclassifiable/Attainment Fremont CountyUnclassifiable/Attainment Greene CountyUnclassifiable/Attainment Grundy CountyUnclassifiable/Attainment Guthrie CountyUnclassifiable/Attainment Hamilton CountyUnclassifiable/Attainment Hancock CountyUnclassifiable/Attainment Hardin CountyUnclassifiable/Attainment Harrison CountyUnclassifiable/Attainment Henry CountyUnclassifiable/Attainment Howard CountyUnclassifiable/Attainment Humboldt CountyUnclassifiable/Attainment Ida CountyUnclassifiable/Attainment Iowa CountyUnclassifiable/Attainment Jackson CountyUnclassifiable/Attainment Jasper CountyUnclassifiable/Attainment Jefferson CountyUnclassifiable/Attainment Johnson CountyUnclassifiable/Attainment Jones CountyUnclassifiable/Attainment Keokuk CountyUnclassifiable/Attainment Kossuth CountyUnclassifiable/Attainment Lee CountyUnclassifiable/Attainment Linn CountyUnclassifiable/Attainment Louisa CountyUnclassifiable/Attainment Lucas CountyUnclassifiable/Attainment Lyon CountyUnclassifiable/Attainment Madison CountyUnclassifiable/Attainment Mahaska CountyUnclassifiable/Attainment Marion CountyUnclassifiable/Attainment Marshall CountyUnclassifiable/Attainment Mills CountyUnclassifiable/Attainment Mitchell CountyUnclassifiable/Attainment Monona CountyUnclassifiable/Attainment Monroe CountyUnclassifiable/Attainment Montgomery CountyUnclassifiable/Attainment Muscatine CountyUnclassifiable/Attainment O'Brien CountyUnclassifiable/Attainment Osceola CountyUnclassifiable/Attainment Page CountyUnclassifiable/Attainment Palo Alto CountyUnclassifiable/Attainment Plymouth CountyUnclassifiable/Attainment Pocahontas CountyUnclassifiable/Attainment Polk CountyUnclassifiable/Attainment Pottawattamie CountyUnclassifiable/Attainment Poweshiek CountyUnclassifiable/Attainment Ringgold CountyUnclassifiable/Attainment Sac CountyUnclassifiable/Attainment Scott CountyUnclassifiable/Attainment Shelby CountyUnclassifiable/Attainment Sioux CountyUnclassifiable/Attainment Story CountyUnclassifiable/Attainment Tama CountyUnclassifiable/Attainment Taylor CountyUnclassifiable/Attainment Union CountyUnclassifiable/Attainment Van Buren CountyUnclassifiable/Attainment Wapello CountyUnclassifiable/Attainment Warren CountyUnclassifiable/Attainment Washington CountyUnclassifiable/Attainment Wayne CountyUnclassifiable/Attainment Webster CountyUnclassifiable/Attainment Winnebago CountyUnclassifiable/Attainment Winneshiek CountyUnclassifiable/Attainment Woodbury CountyUnclassifiable/Attainment Worth CountyUnclassifiable/Attainment Wright CountyUnclassifiable/Attainment

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

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

Iowa—NO2 (1971 Annual Standard)

Designated area Does not meet primary standards Cannot be classified or better than national standards Entire StateX

Iowa—NO2 (2010 1-Hour Standard)

Designated area Designation aDate 1Type Adair CountyUnclassifiable/Attainment. Adams CountyUnclassifiable/Attainment. Allamakee CountyUnclassifiable/Attainment. Appanoose CountyUnclassifiable/Attainment. Audubon CountyUnclassifiable/Attainment. Benton CountyUnclassifiable/Attainment. Black Hawk CountyUnclassifiable/Attainment. Boone CountyUnclassifiable/Attainment. Bremer CountyUnclassifiable/Attainment. Buchanan CountyUnclassifiable/Attainment. Buena Vista CountyUnclassifiable/Attainment. Butler CountyUnclassifiable/Attainment. Calhoun CountyUnclassifiable/Attainment. Carroll CountyUnclassifiable/Attainment. Cass CountyUnclassifiable/Attainment. Cedar CountyUnclassifiable/Attainment. Cerro Gordo CountyUnclassifiable/Attainment. Cherokee CountyUnclassifiable/Attainment. Chickasaw CountyUnclassifiable/Attainment. Clarke CountyUnclassifiable/Attainment. Clay CountyUnclassifiable/Attainment. Clayton CountyUnclassifiable/Attainment. Clinton CountyUnclassifiable/Attainment. Crawford CountyUnclassifiable/Attainment. Dallas CountyUnclassifiable/Attainment. Davis CountyUnclassifiable/Attainment. Decatur CountyUnclassifiable/Attainment. Delaware CountyUnclassifiable/Attainment. Des Moines CountyUnclassifiable/Attainment. Dickinson CountyUnclassifiable/Attainment. Dubuque CountyUnclassifiable/Attainment. Emmet CountyUnclassifiable/Attainment. Fayette CountyUnclassifiable/Attainment. Floyd CountyUnclassifiable/Attainment. Franklin CountyUnclassifiable/Attainment. Fremont CountyUnclassifiable/Attainment. Greene CountyUnclassifiable/Attainment. Grundy CountyUnclassifiable/Attainment. Guthrie CountyUnclassifiable/Attainment. Hamilton CountyUnclassifiable/Attainment. Hancock CountyUnclassifiable/Attainment. Hardin CountyUnclassifiable/Attainment. Harrison CountyUnclassifiable/Attainment. Henry CountyUnclassifiable/Attainment. Howard CountyUnclassifiable/Attainment. Humboldt CountyUnclassifiable/Attainment. Ida CountyUnclassifiable/Attainment. Iowa CountyUnclassifiable/Attainment. Jackson CountyUnclassifiable/Attainment. Jasper CountyUnclassifiable/Attainment. Jefferson CountyUnclassifiable/Attainment. Johnson CountyUnclassifiable/Attainment. Jones CountyUnclassifiable/Attainment. Keokuk CountyUnclassifiable/Attainment. Kossuth CountyUnclassifiable/Attainment. Lee CountyUnclassifiable/Attainment. Linn CountyUnclassifiable/Attainment. Louisa CountyUnclassifiable/Attainment. Lucas CountyUnclassifiable/Attainment. Lyon CountyUnclassifiable/Attainment. Madison CountyUnclassifiable/Attainment. Mahaska CountyUnclassifiable/Attainment. Marion CountyUnclassifiable/Attainment. Marshall CountyUnclassifiable/Attainment. Mills CountyUnclassifiable/Attainment. Mitchell CountyUnclassifiable/Attainment. Monona CountyUnclassifiable/Attainment. Monroe CountyUnclassifiable/Attainment. Montgomery CountyUnclassifiable/Attainment. Muscatine CountyUnclassifiable/Attainment. O'Brien CountyUnclassifiable/Attainment. Osceola CountyUnclassifiable/Attainment. Page CountyUnclassifiable/Attainment. Palo Alto CountyUnclassifiable/Attainment. Plymouth CountyUnclassifiable/Attainment. Pocahontas CountyUnclassifiable/Attainment. Polk CountyUnclassifiable/Attainment. Pottawattamie CountyUnclassifiable/Attainment. Poweshiek CountyUnclassifiable/Attainment. Ringgold CountyUnclassifiable/Attainment. Sac CountyUnclassifiable/Attainment. Scott CountyUnclassifiable/Attainment. Shelby CountyUnclassifiable/Attainment. Sioux CountyUnclassifiable/Attainment. Story CountyUnclassifiable/Attainment. Tama CountyUnclassifiable/Attainment. Taylor CountyUnclassifiable/Attainment. Union CountyUnclassifiable/Attainment. Van Buren CountyUnclassifiable/Attainment. Wapello CountyUnclassifiable/Attainment. Warren CountyUnclassifiable/Attainment. Washington CountyUnclassifiable/Attainment. Wayne CountyUnclassifiable/Attainment. Webster CountyUnclassifiable/Attainment. Winnebago CountyUnclassifiable/Attainment. Winneshiek CountyUnclassifiable/Attainment. Woodbury CountyUnclassifiable/Attainment. Worth CountyUnclassifiable/Attainment. Wright 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.

Iowa—1997 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area Designation aCategory/classification Date 1Type Date 1Type StatewideUnclassifiable/Attainment Adair County Adams County Allamakee County Appanoose County Audubon County Benton County Black Hawk County Boone County Bremer County Buchanan County Buena Vista County Butler County Calhoun County Carroll County Cass County Cedar County Cerro Gordo County Cherokee County Chickasaw County Clarke County Clay County Clayton County Clinton County Crawford County Dallas County Davis County Decatur County Delaware County Des Moines County Dickinson County Dubuque County Emmet County Fayette County Floyd County Franklin County Fremont County Greene County Grundy County Guthrie County Hamilton County Hancock County Hardin County Harrison County Henry County Howard County Humboldt County Ida County Iowa County Jackson County Jasper County Jefferson County Johnson County Jones County Keokuk County Kossuth County Lee County Linn County Louisa County Lucas County Lyon County Madison County Mahaska County Marion County Marshall County Mills County Mitchell County Monona County Monroe County Montgomery County Muscatine County O'Brien County Osceola County Page County Palo Alto County Plymouth County Pocahontas County Polk County Pottawattamie County Poweshiek County Ringgold County Sac County Scott County Shelby County Sioux County Story County Tama County Taylor County Union County Van Buren County Wapello County Warren County Washington County Wayne County Webster County Winnebago County Winneshiek County Woodbury County Worth County Wright 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.

Iowa—2008 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area Designation Classification Date 1Type Date 1Type Statewide and Any Areas of Indian Country:Unclassifiable/Attainment Adair County Adams County Allamakee County Appanoose County Audubon County Benton County Black Hawk County Boone County Bremer County Buchanan County Buena Vista County Butler County Calhoun County Carroll County Cass County Cedar County Cerro Gordo County Cherokee County Chickasaw County Clarke County Clay County Clayton County Clinton County Crawford County Dallas County Davis County Decatur County Delaware County Des Moines County Dickinson County Dubuque County Emmet County Fayette County Floyd County Franklin County Fremont County Greene County Grundy County Guthrie County Hamilton County Hancock County Hardin County Harrison County Henry County Howard County Humboldt County Ida County Iowa County Jackson County Jasper County Jefferson County Johnson County Jones County Keokuk County Kossuth County Lee County Linn County Louisa County Lucas County Lyon County Madison County Mahaska County Marion County Marshall County Mills County Mitchell County Monona County Monroe County Montgomery County Muscatine County O'Brien County Osceola County Page County Palo Alto County Plymouth County Pocahontas County Polk County Pottawattamie County Poweshiek County Ringgold County Sac County Scott County Shelby County Sioux County Story County Tama County Taylor County Union County Van Buren County Wapello County Warren County Washington County Wayne County Webster County Winnebago County Winneshiek County Woodbury County Worth County Wright County

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

Iowa—2015 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area 1Designation Classification Date 2Type Date Type StatewideAttainment/Unclassifiable Adair County.Adams County.Allamakee County.Appanoose County.Audubon County.Benton County.Black Hawk County.Boone County.Bremer County.Buchanan County.Buena Vista County.Butler County.Calhoun County.Carroll County.Cass County.Cedar County.Cerro Gordo County.Cherokee County.Chickasaw County.Clarke County.Clay County.Clayton County.Clinton County.Crawford County.Dallas County.Davis County.Decatur County.Delaware County.Des Moines County.Dickinson County.Dubuque County.Emmet County.Fayette County.Floyd County.Franklin County.Fremont County.Greene County.Grundy County.Guthrie County.Hamilton County.Hancock County.Hardin County.Harrison County.Henry County.Howard County.Humboldt County.Ida County.Iowa County.Jackson County.Jasper County.Jefferson County.Johnson County.Jones County.Keokuk County.Kossuth County.Lee County.Linn County.Louisa County.Lucas County.Lyon County.Madison County.Mahaska County.Marion County.Marshall County.Mills County.Mitchell County.Monona County.Monroe County.Montgomery County.Muscatine County.O'Brien County.Osceola County.Page County.Palo Alto County.Plymouth County.Pocahontas County.Polk County.Pottawattamie County.Poweshiek County.Ringgold County.Sac County.Scott County.Shelby County.Sioux County.Story County.Tama County.Taylor County.Union County.Van Buren County.Wapello County.Warren County.Washington County.Wayne County.Webster County.Winnebago County.Winneshiek County.Woodbury County.Worth County.Wright County..

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

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

Iowa—2008 Lead NAAQS

Designated area Designation for the 2008 NAAQS aDate 1Type Pottawattamie County, IA: Pottawattamie County (part)10/4/2018Attainment. Area bounded by Avenue G on the north, N 16th/S 16th street on the east, 23rd Avenue on the south, and N 35th/S 35th street on the west Rest of 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 § 81.316, 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 81.316