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 Waterloo X Cedar Falls Township X East Waterloo Township X Remainder of Black Hawk County X 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 R20W X 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 R20W X Falls Township X Lake Township X Lincoln Township X Remainder of Cerro Gordo County X An area around downtown Clinton X Comanche Township X Remainder of Clinton County X Burlington Township X Remainder of Des Moines County X Iowa City Township X Remainder of Johnson County X An area in and near Keokuk X Jackson Township X Jefferson Township X Madison Township X Remainder of Lee County X Cedar Rapids—a portion of Linn County contained entirely within T 82 N., R 7 W.; and T 83 N., R 7 W X Bertram Township X Clinton Township X College Township X Fairfax Township X Marion Township X Monroe Township X Putnam Township X Remainder of Linn County X The central portion of Marshalltown X Remainder of Marshall County X The central and southern portions of Muscatine X Fruitland Township X Sweetland Township X Montpelier Township X Remainder of Muscatine County X 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 W X Clay Township X Douglas Township X Jefferson Township X Remainder of Polk County X The western portion of Council Bluffs and Carter Lake X Lake Township X Lewis Township X Remainder of Pottawatomie County X Portions of Buffalo, Davenport, Bettendorf and Riverdale X Remainder of Scott County X Center Township X Remainder of Wapello County X The central portion Ft. Dodge X Otho Township X Remainder of Webster County X The central and southern portions of Sioux City X Liberty Township X Woodbury Township X Remainder of Woodbury County X Remainder of State X 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 state X Iowa—2010 Sulfur Dioxide NAAQS [Primary] Designated area 1 Designation Date 2 Type Muscatine, IA 11/18/2025 Attainment. 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, IA Unclassifiable. Linn County Woodbury County, IA 9/12/2016 Unclassifiable. Woodbury County Des Moines County, IA 9/12/2016 Attainment/Unclassifiable. Des Moines County Louisa County, IA Attainment/Unclassifiable. Louisa County Pottawattamie County, IA Attainment/Unclassifiable. Pottawattamie County Wapello County, IA 9/12/2016 Attainment/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 10/4/2013) 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 1 Type Date 1 Type Statewide 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 November 15, 1990, unless otherwise noted. Iowa—Ozone (1-Hour Standard) 2 Designated area Designation Classification Date 1 Type Date 1 Type Statewide 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 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 PM 2.5 NAAQS [Primary and Secondary] Designated area Designation a Classification Date 1 Type Date Type Statewide: Adair County Unclassifiable/Attainment. Adams County Unclassifiable/Attainment. Allamakee County Unclassifiable/Attainment. Appanoose County Unclassifiable/Attainment. Audubon County Unclassifiable/Attainment. Benton County Unclassifiable/Attainment. Black Hawk County Unclassifiable/Attainment. Boone County Unclassifiable/Attainment. Bremer County Unclassifiable/Attainment. Buchanan County Unclassifiable/Attainment. Buena Vista County Unclassifiable/Attainment. Butler County Unclassifiable/Attainment. Calhoun County Unclassifiable/Attainment. Carroll County Unclassifiable/Attainment. Cass County Unclassifiable/Attainment. Cedar County Unclassifiable/Attainment. Cerro Gordo County Unclassifiable/Attainment. Cherokee County Unclassifiable/Attainment. Chickasaw County Unclassifiable/Attainment. Clarke County Unclassifiable/Attainment. Clay County Unclassifiable/Attainment. Clayton County Unclassifiable/Attainment. Clinton County Unclassifiable/Attainment. Crawford County Unclassifiable/Attainment. Dallas County Unclassifiable/Attainment. Davis County Unclassifiable/Attainment. Decatur County Unclassifiable/Attainment. Delaware County Unclassifiable/Attainment. Des Moines County Unclassifiable/Attainment. Dickinson County Unclassifiable/Attainment. Dubuque County Unclassifiable/Attainment. Emmet County Unclassifiable/Attainment. Fayette County Unclassifiable/Attainment. Floyd County Unclassifiable/Attainment. Franklin County Unclassifiable/Attainment. Fremont County Unclassifiable/Attainment. Greene County Unclassifiable/Attainment. Grundy County Unclassifiable/Attainment. Guthrie County Unclassifiable/Attainment. Hamilton County Unclassifiable/Attainment. Hancock County Unclassifiable/Attainment. Hardin County Unclassifiable/Attainment. Harrison County Unclassifiable/Attainment. Henry County Unclassifiable/Attainment. Howard County Unclassifiable/Attainment. Humboldt County Unclassifiable/Attainment. Ida County Unclassifiable/Attainment. Iowa County Unclassifiable/Attainment. Jackson County Unclassifiable/Attainment. Jasper County Unclassifiable/Attainment. Jefferson County Unclassifiable/Attainment. Johnson County Unclassifiable/Attainment. Jones County Unclassifiable/Attainment. Keokuk County Unclassifiable/Attainment. Kossuth County Unclassifiable/Attainment. Lee County Unclassifiable/Attainment. Linn County Unclassifiable/Attainment. Louisa County Unclassifiable/Attainment. Lucas County Unclassifiable/Attainment. Lyon County Unclassifiable/Attainment. Madison County Unclassifiable/Attainment. Mahaska County Unclassifiable/Attainment. Marion County Unclassifiable/Attainment. Marshall County Unclassifiable/Attainment. Mills County Unclassifiable/Attainment. Mitchell County Unclassifiable/Attainment. Monona County Unclassifiable/Attainment. Monroe County Unclassifiable/Attainment. Montgomery County Unclassifiable/Attainment. Muscatine County Unclassifiable/Attainment. O'Brien County Unclassifiable/Attainment. Osceola County Unclassifiable/Attainment. Page County Unclassifiable/Attainment. Palo Alto County Unclassifiable/Attainment. Plymouth County Unclassifiable/Attainment. Pocahontas County Unclassifiable/Attainment. Polk County Unclassifiable/Attainment. Pottawattamie County Unclassifiable/Attainment. Poweshiek County Unclassifiable/Attainment. Ringgold County Unclassifiable/Attainment. Sac County Unclassifiable/Attainment. Scott County Unclassifiable/Attainment. Shelby County Unclassifiable/Attainment. Sioux County Unclassifiable/Attainment. Story County Unclassifiable/Attainment. Tama County Unclassifiable/Attainment. Taylor County Unclassifiable/Attainment. Union County Unclassifiable/Attainment. Van Buren County Unclassifiable/Attainment. Wapello County Unclassifiable/Attainment. Warren County Unclassifiable/Attainment. Washington County Unclassifiable/Attainment. Wayne County Unclassifiable/Attainment. Webster County Unclassifiable/Attainment. Winnebago County Unclassifiable/Attainment. Winneshiek County Unclassifiable/Attainment. Woodbury County Unclassifiable/Attainment. Worth County Unclassifiable/Attainment. Wright County Unclassifiable/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 PM 2.5 NAAQS [Primary] Designated area 1 Designation Classification Date 2 Type Date 2 Type Statewide: Adair County Unclassifiable/Attainment Adams County Unclassifiable/Attainment Allamakee County Unclassifiable/Attainment Appanoose County Unclassifiable/Attainment Audubon County Unclassifiable/Attainment Benton County Unclassifiable/Attainment Black Hawk County Unclassifiable/Attainment Boone County Unclassifiable/Attainment Bremer County Unclassifiable/Attainment Buchanan County Unclassifiable/Attainment Buena Vista County Unclassifiable/Attainment Butler County Unclassifiable/Attainment Calhoun County Unclassifiable/Attainment Carroll County Unclassifiable/Attainment Cass County Unclassifiable/Attainment Cedar County Unclassifiable/Attainment Cerro Gordo County Unclassifiable/Attainment Cherokee County Unclassifiable/Attainment Chickasaw County Unclassifiable/Attainment Clarke County Unclassifiable/Attainment Clay County Unclassifiable/Attainment Clayton County Unclassifiable/Attainment Clinton County Unclassifiable/Attainment Crawford County Unclassifiable/Attainment Dallas County Unclassifiable/Attainment Davis County Unclassifiable/Attainment Decatur County Unclassifiable/Attainment Delaware County Unclassifiable/Attainment Des Moines County Unclassifiable/Attainment Dickinson County Unclassifiable/Attainment Dubuque County Unclassifiable/Attainment Emmet County Unclassifiable/Attainment Fayette County Unclassifiable/Attainment Floyd County Unclassifiable/Attainment Franklin County Unclassifiable/Attainment Fremont County Unclassifiable/Attainment Greene County Unclassifiable/Attainment Grundy County Unclassifiable/Attainment Guthrie County Unclassifiable/Attainment Hamilton County Unclassifiable/Attainment Hancock County Unclassifiable/Attainment Hardin County Unclassifiable/Attainment Harrison County Unclassifiable/Attainment Henry County Unclassifiable/Attainment Howard County Unclassifiable/Attainment Humboldt County Unclassifiable/Attainment Ida County Unclassifiable/Attainment Iowa County Unclassifiable/Attainment Jackson County Unclassifiable/Attainment Jasper County Unclassifiable/Attainment Jefferson County Unclassifiable/Attainment Johnson County Unclassifiable/Attainment Jones County Unclassifiable/Attainment Keokuk County Unclassifiable/Attainment Kossuth County Unclassifiable/Attainment Lee County Unclassifiable/Attainment Linn County Unclassifiable/Attainment Louisa County Unclassifiable/Attainment Lucas County Unclassifiable/Attainment Lyon County Unclassifiable/Attainment Madison County Unclassifiable/Attainment Mahaska County Unclassifiable/Attainment Marion County Unclassifiable/Attainment Marshall County Unclassifiable/Attainment Mills County Unclassifiable/Attainment Mitchell County Unclassifiable/Attainment Monona County Unclassifiable/Attainment Monroe County Unclassifiable/Attainment Montgomery County Unclassifiable/Attainment Muscatine County Unclassifiable/Attainment O'Brien County Unclassifiable/Attainment Osceola County Unclassifiable/Attainment Page County Unclassifiable/Attainment Palo Alto County Unclassifiable/Attainment Plymouth County Unclassifiable/Attainment Pocahontas County Unclassifiable/Attainment Polk County Unclassifiable/Attainment Pottawattamie County Unclassifiable/Attainment Poweshiek County Unclassifiable/Attainment Ringgold County Unclassifiable/Attainment Sac County Unclassifiable/Attainment Scott County Unclassifiable/Attainment Shelby County Unclassifiable/Attainment Sioux County Unclassifiable/Attainment Story County Unclassifiable/Attainment Tama County Unclassifiable/Attainment Taylor County Unclassifiable/Attainment Union County Unclassifiable/Attainment Van Buren County Unclassifiable/Attainment Wapello County Unclassifiable/Attainment Warren County Unclassifiable/Attainment Washington County Unclassifiable/Attainment Wayne County Unclassifiable/Attainment Webster County Unclassifiable/Attainment Winnebago County Unclassifiable/Attainment Winneshiek County Unclassifiable/Attainment Woodbury County Unclassifiable/Attainment Worth County Unclassifiable/Attainment Wright County Unclassifiable/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 PM 2.5 NAAQS [Primary and Secondary] Designated area Designation a Classification Date 1 Type Date Type Statewide: Adair County Unclassifiable/Attainment Adams County Unclassifiable/Attainment Allamakee County Unclassifiable/Attainment Appanoose County Unclassifiable/Attainment Audubon County Unclassifiable/Attainment Benton County Unclassifiable/Attainment Black Hawk County Unclassifiable/Attainment Boone County Unclassifiable/Attainment Bremer County Unclassifiable/Attainment Buchanan County Unclassifiable/Attainment Buena Vista County Unclassifiable/Attainment Butler County Unclassifiable/Attainment Calhoun County Unclassifiable/Attainment Carroll County Unclassifiable/Attainment Cass County Unclassifiable/Attainment Cedar County Unclassifiable/Attainment Cerro Gordo County Unclassifiable/Attainment Cherokee County Unclassifiable/Attainment Chickasaw County Unclassifiable/Attainment Clarke County Unclassifiable/Attainment Clay County Unclassifiable/Attainment Clayton County Unclassifiable/Attainment Clinton County Unclassifiable/Attainment Crawford County Unclassifiable/Attainment Dallas County Unclassifiable/Attainment Davis County Unclassifiable/Attainment Decatur County Unclassifiable/Attainment Delaware County Unclassifiable/Attainment Des Moines County Unclassifiable/Attainment Dickinson County Unclassifiable/Attainment Dubuque County Unclassifiable/Attainment Emmet County Unclassifiable/Attainment Fayette County Unclassifiable/Attainment Floyd County Unclassifiable/Attainment Franklin County Unclassifiable/Attainment Fremont County Unclassifiable/Attainment Greene County Unclassifiable/Attainment Grundy County Unclassifiable/Attainment Guthrie County Unclassifiable/Attainment Hamilton County Unclassifiable/Attainment Hancock County Unclassifiable/Attainment Hardin County Unclassifiable/Attainment Harrison County Unclassifiable/Attainment Henry County Unclassifiable/Attainment Howard County Unclassifiable/Attainment Humboldt County Unclassifiable/Attainment Ida County Unclassifiable/Attainment Iowa County Unclassifiable/Attainment Jackson County Unclassifiable/Attainment Jasper County Unclassifiable/Attainment Jefferson County Unclassifiable/Attainment Johnson County Unclassifiable/Attainment Jones County Unclassifiable/Attainment Keokuk County Unclassifiable/Attainment Kossuth County Unclassifiable/Attainment Lee County Unclassifiable/Attainment Linn County Unclassifiable/Attainment Louisa County Unclassifiable/Attainment Lucas County Unclassifiable/Attainment Lyon County Unclassifiable/Attainment Madison County Unclassifiable/Attainment Mahaska County Unclassifiable/Attainment Marion County Unclassifiable/Attainment Marshall County Unclassifiable/Attainment Mills County Unclassifiable/Attainment Mitchell County Unclassifiable/Attainment Monona County Unclassifiable/Attainment Monroe County Unclassifiable/Attainment Montgomery County Unclassifiable/Attainment Muscatine County Unclassifiable/Attainment O'Brien County Unclassifiable/Attainment Osceola County Unclassifiable/Attainment Page County Unclassifiable/Attainment Palo Alto County Unclassifiable/Attainment Plymouth County Unclassifiable/Attainment Pocahontas County Unclassifiable/Attainment Polk County Unclassifiable/Attainment Pottawattamie County Unclassifiable/Attainment Poweshiek County Unclassifiable/Attainment Ringgold County Unclassifiable/Attainment Sac County Unclassifiable/Attainment Scott County Unclassifiable/Attainment Shelby County Unclassifiable/Attainment Sioux County Unclassifiable/Attainment Story County Unclassifiable/Attainment Tama County Unclassifiable/Attainment Taylor County Unclassifiable/Attainment Union County Unclassifiable/Attainment Van Buren County Unclassifiable/Attainment Wapello County Unclassifiable/Attainment Warren County Unclassifiable/Attainment Washington County Unclassifiable/Attainment Wayne County Unclassifiable/Attainment Webster County Unclassifiable/Attainment Winnebago County Unclassifiable/Attainment Winneshiek County Unclassifiable/Attainment Woodbury County Unclassifiable/Attainment Worth County Unclassifiable/Attainment Wright County Unclassifiable/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 PM 2.5 NAAQS [Primary and Secondary] Designated area Designation a Classification Date 1 Type Date Type Statewide: Adair County Unclassifiable/Attainment Adams County Unclassifiable/Attainment Allamakee County Unclassifiable/Attainment Appanoose County Unclassifiable/Attainment Audubon County Unclassifiable/Attainment Benton County Unclassifiable/Attainment Black Hawk County Unclassifiable/Attainment Boone County Unclassifiable/Attainment Bremer County Unclassifiable/Attainment Buchanan County Unclassifiable/Attainment Buena Vista County Unclassifiable/Attainment Butler County Unclassifiable/Attainment Calhoun County Unclassifiable/Attainment Carroll County Unclassifiable/Attainment Cass County Unclassifiable/Attainment Cedar County Unclassifiable/Attainment Cerro Gordo County Unclassifiable/Attainment Cherokee County Unclassifiable/Attainment Chickasaw County Unclassifiable/Attainment Clarke County Unclassifiable/Attainment Clay County Unclassifiable/Attainment Clayton County Unclassifiable/Attainment Clinton County Unclassifiable/Attainment Crawford County Unclassifiable/Attainment Dallas County Unclassifiable/Attainment Davis County Unclassifiable/Attainment Decatur County Unclassifiable/Attainment Delaware County Unclassifiable/Attainment Des Moines County Unclassifiable/Attainment Dickinson County Unclassifiable/Attainment Dubuque County Unclassifiable/Attainment Emmet County Unclassifiable/Attainment Fayette County Unclassifiable/Attainment Floyd County Unclassifiable/Attainment Franklin County Unclassifiable/Attainment Fremont County Unclassifiable/Attainment Greene County Unclassifiable/Attainment Grundy County Unclassifiable/Attainment Guthrie County Unclassifiable/Attainment Hamilton County Unclassifiable/Attainment Hancock County Unclassifiable/Attainment Hardin County Unclassifiable/Attainment Harrison County Unclassifiable/Attainment Henry County Unclassifiable/Attainment Howard County Unclassifiable/Attainment Humboldt County Unclassifiable/Attainment Ida County Unclassifiable/Attainment Iowa County Unclassifiable/Attainment Jackson County Unclassifiable/Attainment Jasper County Unclassifiable/Attainment Jefferson County Unclassifiable/Attainment Johnson County Unclassifiable/Attainment Jones County Unclassifiable/Attainment Keokuk County Unclassifiable/Attainment Kossuth County Unclassifiable/Attainment Lee County Unclassifiable/Attainment Linn County Unclassifiable/Attainment Louisa County Unclassifiable/Attainment Lucas County Unclassifiable/Attainment Lyon County Unclassifiable/Attainment Madison County Unclassifiable/Attainment Mahaska County Unclassifiable/Attainment Marion County Unclassifiable/Attainment Marshall County Unclassifiable/Attainment Mills County Unclassifiable/Attainment Mitchell County Unclassifiable/Attainment Monona County Unclassifiable/Attainment Monroe County Unclassifiable/Attainment Montgomery County Unclassifiable/Attainment Muscatine County Unclassifiable/Attainment O'Brien County Unclassifiable/Attainment Osceola County Unclassifiable/Attainment Page County Unclassifiable/Attainment Palo Alto County Unclassifiable/Attainment Plymouth County Unclassifiable/Attainment Pocahontas County Unclassifiable/Attainment Polk County Unclassifiable/Attainment Pottawattamie County Unclassifiable/Attainment Poweshiek County Unclassifiable/Attainment Ringgold County Unclassifiable/Attainment Sac County Unclassifiable/Attainment Scott County Unclassifiable/Attainment Shelby County Unclassifiable/Attainment Sioux County Unclassifiable/Attainment Story County Unclassifiable/Attainment Tama County Unclassifiable/Attainment Taylor County Unclassifiable/Attainment Union County Unclassifiable/Attainment Van Buren County Unclassifiable/Attainment Wapello County Unclassifiable/Attainment Warren County Unclassifiable/Attainment Washington County Unclassifiable/Attainment Wayne County Unclassifiable/Attainment Webster County Unclassifiable/Attainment Winnebago County Unclassifiable/Attainment Winneshiek County Unclassifiable/Attainment Woodbury County Unclassifiable/Attainment Worth County Unclassifiable/Attainment Wright County Unclassifiable/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. Iowa—NO 2 (1971 Annual Standard) Designated area Does not meet primary standards Cannot be classified or better than national standards Entire State X Iowa—NO 2 (2010 1-Hour Standard) Designated area Designation a Date 1 Type Adair County Unclassifiable/Attainment. Adams County Unclassifiable/Attainment. Allamakee County Unclassifiable/Attainment. Appanoose County Unclassifiable/Attainment. Audubon County Unclassifiable/Attainment. Benton County Unclassifiable/Attainment. Black Hawk County Unclassifiable/Attainment. Boone County Unclassifiable/Attainment. Bremer County Unclassifiable/Attainment. Buchanan County Unclassifiable/Attainment. Buena Vista County Unclassifiable/Attainment. Butler County Unclassifiable/Attainment. Calhoun County Unclassifiable/Attainment. Carroll County Unclassifiable/Attainment. Cass County Unclassifiable/Attainment. Cedar County Unclassifiable/Attainment. Cerro Gordo County Unclassifiable/Attainment. Cherokee County Unclassifiable/Attainment. Chickasaw County Unclassifiable/Attainment. Clarke County Unclassifiable/Attainment. Clay County Unclassifiable/Attainment. Clayton County Unclassifiable/Attainment. Clinton County Unclassifiable/Attainment. Crawford County Unclassifiable/Attainment. Dallas County Unclassifiable/Attainment. Davis County Unclassifiable/Attainment. Decatur County Unclassifiable/Attainment. Delaware County Unclassifiable/Attainment. Des Moines County Unclassifiable/Attainment. Dickinson County Unclassifiable/Attainment. Dubuque County Unclassifiable/Attainment. Emmet County Unclassifiable/Attainment. Fayette County Unclassifiable/Attainment. Floyd County Unclassifiable/Attainment. Franklin County Unclassifiable/Attainment. Fremont County Unclassifiable/Attainment. Greene County Unclassifiable/Attainment. Grundy County Unclassifiable/Attainment. Guthrie County Unclassifiable/Attainment. Hamilton County Unclassifiable/Attainment. Hancock County Unclassifiable/Attainment. Hardin County Unclassifiable/Attainment. Harrison County Unclassifiable/Attainment. Henry County Unclassifiable/Attainment. Howard County Unclassifiable/Attainment. Humboldt County Unclassifiable/Attainment. Ida County Unclassifiable/Attainment. Iowa County Unclassifiable/Attainment. Jackson County Unclassifiable/Attainment. Jasper County Unclassifiable/Attainment. Jefferson County Unclassifiable/Attainment. Johnson County Unclassifiable/Attainment. Jones County Unclassifiable/Attainment. Keokuk County Unclassifiable/Attainment. Kossuth County Unclassifiable/Attainment. Lee County Unclassifiable/Attainment. Linn County Unclassifiable/Attainment. Louisa County Unclassifiable/Attainment. Lucas County Unclassifiable/Attainment. Lyon County Unclassifiable/Attainment. Madison County Unclassifiable/Attainment. Mahaska County Unclassifiable/Attainment. Marion County Unclassifiable/Attainment. Marshall County Unclassifiable/Attainment. Mills County Unclassifiable/Attainment. Mitchell County Unclassifiable/Attainment. Monona County Unclassifiable/Attainment. Monroe County Unclassifiable/Attainment. Montgomery County Unclassifiable/Attainment. Muscatine County Unclassifiable/Attainment. O'Brien County Unclassifiable/Attainment. Osceola County Unclassifiable/Attainment. Page County Unclassifiable/Attainment. Palo Alto County Unclassifiable/Attainment. Plymouth County Unclassifiable/Attainment. Pocahontas County Unclassifiable/Attainment. Polk County Unclassifiable/Attainment. Pottawattamie County Unclassifiable/Attainment. Poweshiek County Unclassifiable/Attainment. Ringgold County Unclassifiable/Attainment. Sac County Unclassifiable/Attainment. Scott County Unclassifiable/Attainment. Shelby County Unclassifiable/Attainment. Sioux County Unclassifiable/Attainment. Story County Unclassifiable/Attainment. Tama County Unclassifiable/Attainment. Taylor County Unclassifiable/Attainment. Union County Unclassifiable/Attainment. Van Buren County Unclassifiable/Attainment. Wapello County Unclassifiable/Attainment. Warren County Unclassifiable/Attainment. Washington County Unclassifiable/Attainment. Wayne County Unclassifiable/Attainment. Webster County Unclassifiable/Attainment. Winnebago County Unclassifiable/Attainment. Winneshiek County Unclassifiable/Attainment. Woodbury County Unclassifiable/Attainment. Worth County Unclassifiable/Attainment. Wright County Unclassifiable/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 a Category/classification Date 1 Type Date 1 Type Statewide 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 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 1 Type Date 1 Type 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 1 Designation Classification Date 2 Type Date Type 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. 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 a Date 1 Type Pottawattamie County, IA: Pottawattamie County (part) 10/4/2018 Attainment. 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 State Unclassifiable/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.