{"data":{"id":"us/40-cfr-appendix-a-to-part-81","jurisdiction":"us","citation":"40 CFR Appendix A to Part 81","heading":"Appendix A to Part 81—Air Quality Control Regions (AQCR's)","body":"AQCR No.\nAlabama:\nAlabama and Tombigbee Rivers 1\nColumbus-Phenix City 2\nEast Alabama 3\nMetropolitan Birmingham 4\nMobile-Pensacola-Panama City-Southern Mississippi (Fla., Miss.) 5\nSoutheast Alabama 6\nTennessee River Valley-Cumberland Mountains (Tenn.) 7\nAlaska:\nCook Inlet 8\nNorthern Alaska 9\nSouth Central Alaska 10\nSoutheastern Alaska 11\nArizona:\nArizona-New Mexico Southern Border (N. Mex.) 12\nClark-Mohave 13\nFour Corners (Colo., N. Mex., Utah) 14\nPhoenix-Tucson 15\nArkansas:\nCentral Arkansas 16\nMetropolitan Fort Smith 17\nMetropolitan Memphis 18\nMonroe-El Dorado (La.) 19\nNortheast Arkansas 20\nNorthwest Arkansas 21\nShreveport-Texarkana-Tyler (La., Okla., Texas) 22\nCalifornia:\nGreat Basin Valley 23\nMetropolitan Los Angeles 24\nNorth Central Coast 25\nNorth Coast 26\nNortheast Plateau 27\nSacramento Valley 28\nSan Diego 29\nSan Francisco Bay Area 30\nSan Joaquin Valley 31\nSouth Central Coast 32\nSoutheast Desert 33\nColorado:\nComanche 34\nFour Corners (Ariz., N. Mex., Utah) 14\nGrand Mesa 35\nMetropolitan Denver 36\nPawnee 37\nSan Isabel 38\nSan Luis 39\nYampa 40\nConnecticut:\nEastern Connecticut 41\nHartford-New Haven-Springfield (Mass.) 42\nNew Jersey-New York-Connecticut (N.J., N.Y.) 43\nNorthwestern Connecticut 44\nDelaware:\nMetropolitan Philadelphia (N.J., Pa.) 45\nSouthern Delaware 46\nDistrict of Columbia:\nNational Capital (Md.) 47\nFlorida:\nCentral Florida 48\nJacksonville-Brunswick (Ga.) 49\nMobile-Pensacola-Panama City-Southern Mississippi (Ala., Miss.) 5\nSoutheast Florida 50\nSouthwest Florida 51\nWest Central Florida 52\nGeorgia:\nAugusta-Aiken (S.C.) 53\nCentral Georgia 54\nChattanooga (Tenn.) 55\nColumbus-Phenix City (Ala.) 2\nJacksonville-Brunswick (Fla.) 49\nMetropolitan Atlanta 56\nNortheast Georgia 57\nSavannah-Beaufort (S.C.) 58\nSouthwest Georgia 59\nHawaii:\nEntire State 60\nIdaho:\nEastern Idaho 61\nEastern Washington-Northern Idaho (Wash.) 62\nIdaho 63\nMetropolitan Boise 64\nIllinois:\nBurlington-Keokuk (Iowa) 65\nEast Central Illinois 66\nMetropolitan Chicago (Ind.) 67\nMetropolitan Dubuque (Iowa, Wis.) 68\nMetropolitan Quad Cities (Iowa) 69\nMetropolitan St. Louis (Mo.) 70\nNorth Central Illinois 71\nPaducah-Cairo (Ky.) 72\nRockford-Janesville-Beloit (Wis.) 73\nSoutheast Illinois 74\nWest Central Illinois 75\nIndiana:\nEast Central Indiana 76\nEvansville-Owensboro-Henderson (Ky.) 77\nLouisville (Ky.) 78\nMetropolitan Chicago (Ill.) 67\nMetropolitan Cincinnati (Ky., Ohio) 79\nMetropolitan Indianapolis 80\nNortheast Indiana 81\nSouth Bend-Elkhart-Benton Harbor (Mich.) 82\nSouthern Indiana 83\nWabash Valley 84\nIowa:\nBurlington-Keokuk (Ill.) 65\nMetropolitan Dubuque (Ill., Wis.) 68\nMetropolitan Omaha-Council Bluffs (Nebr.) 85\nMetropolitan Quad Cities (Ill.) 69\nMetropolitan Sioux City (Nebr., S. Dak.) 86\nMetropolitan Sioux Falls (S. Dak.) 87\nNortheast Iowa 88\nNorth Central Iowa 89\nNorthwest Iowa 90\nSoutheast Iowa 91\nSouth Central Iowa 92\nSouthwest Iowa 93\nKansas:\nMetropolitan Kansas City (Mo.) 94\nNortheast Kansas 95\nNorth Central Kansas 96\nNorthwest Kansas 97\nSoutheast Kansas 98\nSouth Central Kansas 99\nSouthwest Kansas 100\nKentucky:\nAppalachian 101\nBluegrass 102\nEvansville-Owensboro-Henderson (Ind.) 77\nHuntington-Ashland-Portsmouth-Ironton (Ohio, W. Va.) 103\nLouisville (Ind.) 78\nMetropolitan Cincinnati (Ind., Ohio) 79\nNorth Central Kentucky 104\nPaducah-Cairo (Ill.) 72\nSouth Central Kentucky 105\nLouisiana:\nMonroe-El Dorado (Ark.) 19\nShreveport-Texarkana-Tyler (Ark., Okla., Tex.) 22\nSouthern Louisiana-Southeast Texas (Tex.) 106\nMaine:\nAndroscoggin Valley (N.H.) 107\nAroostook 108\nDown East 109\nMetropolitan Portland 110\nNorthwest Maine 111\nMaryland:\nCentral Maryland 112\nCumberland-Keyser (W. Va.) 113\nEastern Shore 114\nMetropolitan Baltimore 115\nNational Capital (D.C.) 47\nSouthern Maryland 116\nMassachusetts:\nBerkshire 117\nCentral Massachusetts 118\nHartford-New Haven-Springfield (Conn.) 42\nMetropolitan Boston 119\nMetropolitan Providence (R.I.) 120\nMerrimack Valley-Southern New Hampshire (N.H.) 121\nMichigan:\nCentral Michigan 122\nMetropolitan Detroit-Port Huron 123\nMetropolitan Toledo (Ohio) 124\nSouth Bend-Elkhart-Benton Harbor (Ind.) 82\nSouth Central Michigan 125\nUpper Michigan 126\nMinnesota:\nCentral Minnesota 127\nSoutheast Minnesota-La Crosse (Wis.) 128\nDuluth-Superior (Wis.) 129\nMetropolitan Fargo-Moorhead (N. Dak.) 130\nMinneapolis-St. Paul 131\nNorthwest Minnesota 132\nSouthwest Minnesota 133\nMississippi:\nMetropolitan Memphis (Ark., Tenn.) 18\nMississippi Delta 134\nMobile-Pensacola-Panama City-Southern Mississippi (Ala., Fla.) 5\nNortheast Mississippi 135\nMissouri:\nMetropolitan Kansas City (Kans.) 94\nMetropolitan St. Louis (Ill.) 70\nNorthern Missouri 137\nSoutheast Missouri 138\nSouthwest Missouri 139\nMontana:\nBillings 140\nGreat Falls 141\nHelena 142\nMiles City 143\nMissoula 144\nNebraska:\nLincoln-Beatrice-Fairbury 145\nMetropolitan Omaha-Council Bluffs (Iowa) 85\nMetropolitan Sioux City (Iowa, S. Dak.) 86\nNebraska 146\nNevada:\nClark-Mohave (Ariz.) 13\nNevada 147\nNorthwest Nevada 148\nNew Hampshire:\nAndroscoggin Valley (Maine) 107\nMerrimack Valley-Southern New Hampshire (Mass.) 121\nNew Hampshire 149\nNew Jersey:\nMetropolitan Philadelphia (Del., Pa.) 45\nNew Jersey 150\nNew Jersey-New York-Connecticut (N.Y., Conn.) 43\nNortheast Pennsylvania-Upper Delaware Valley (Pa.) 151\nNew Mexico:\nAlbuquerque-Mid Rio Grande 152\nArizona-New Mexico Southern Border (Ariz.) 12\nEl Paso-Las Cruces-Alamogordo (Tex.) 153\nFour Corners (Ariz., Colo., Utah) 14\nNortheastern Plains 154\nPecos-Permian Basin 155\nSouthwestern Mountains-Augustine Plains 156\nUpper Rio Grande Valley 157\nNew York:\nCentral New York 158\nChamplain Valley (Vt.) 159\nGenesee-Finger Lakes 160\nHudson Valley 161\nNew Jersey-New York-Connecticut (N.J., Conn.) 43\nNiagara Frontier 162\nSouthern Tier East 163\nSouthern Tier West 164\nNorth Carolina:\nEastern Mountain 165\nEastern Piedmont 166\nMetropolitan Charlotte (S.C.) 167\nNorthern Coastal Plain 168\nNorthern Piedmont 136\nSandhills 169\nSouthern Coastal Plain 170\nWestern Mountain 171\nNorth Dakota:\nMetropolitan Fargo-Moorhead (Minn.) 130\nNorth Dakota 172\nOhio:\nDayton 173\nGreater Metropolitan Cleveland 174\nHuntington-Ashland-Portsmouth-Ironton (Ky., W. Va.) 103\nMansfield-Marion 175\nMetropolitan Cincinnati (Ind., Ky.) 79\nMetropolitan Columbus 176\nMetropolitan Toledo (Mich.) 124\nNorthwest Ohio 177\nNorthwest Pennsylvania-Youngstown (Pa.) 178\nParkersburg-Marietta (W. Va.) 179\nSandusky 180\nSteubenville-Weirton-Wheeling (W. Va.) 181\nWilmington-Chillicothe-Logan 182\nZanesville-Cambridge 183\nOklahoma:\nCentral Oklahoma 184\nMetropolitan Fort Smith (Ark.) 17\nNorth Central Oklahoma 185\nNortheastern Oklahoma 186\nNorthwestern Oklahoma 187\nShreveport-Texarkana-Tyler (Ark., La., Texas) 22\nSoutheastern Oklahoma 188\nSouthwestern Oklahoma 189\nOregon:\nCentral Oregon 190\nEastern Oregon 191\nNorthwest Oregon 192\nPortland (Wash.) 193\nSouthwest Oregon 194\nPennsylvania:\nCentral Pennsylvania 195\nMetropolitan Philadelphia (Del., N.J.) 45\nNortheast Pennsylvania-Upper Delaware Valley (N.J.) 151\nNorthwest Pennsylvania-Youngstown (Ohio) 178\nSouth Central Pennsylvania 196\nSouthwest Pennsylvania 197\nRhode Island:\nMetropolitan Providence (Mass.) 120\nSouth Carolina:\nAugusta-Aiken (Ga.) 53\nCamden-Sumter 198\nCharleston 199\nColumbia 200\nFlorence 201\nGreenville-Spartanburg 202\nGreenwood 203\nGeorgetown 204\nMetropolitan Charlotte (N.C.) 167\nSavannah-Beaufort (Ga.) 58\nSouth Dakota:\nBlack Hills-Rapid City 205\nMetropolitan Sioux City (Iowa, Neb.) 86\nMetropolitan Sioux Falls (Iowa) 87\nSouth Dakota 206\nTennessee:\nChattanooga (Ga.) 55\nEastern Tennessee-Southwestern Virginia (Va.) 207\nMetropolitan Memphis (Ark., Miss.) 18\nMiddle Tennessee 208\nTennessee River Valley-Cumberland Mountains (Ala.) 7\nWestern Tennessee 209\nTexas:\nAbilene-Wichita Falls 210\nAmarillo-Lubbock 211\nAustin-Waco 212\nBrownsville-Laredo 213\nCorpus Christi-Victoria 214\nEl Paso-Las Cruces-Alamagordo (N. Mex.) 153\nMetropolitan Dallas-Ft. Worth 215\nMetropolitan Houston-Galveston 216\nMetropolitan San Antonio 217\nMidland-Odessa-San Angelo 218\nShreveport-Texarkana-Tyler (Ark., La., Okla.) 22\nSouthern Louisiana-Southeast Texas (La.) 106\nUtah:\nFour Corners (Ariz., Colo., N. Mex.) 14\nUtah 219\nWasatch Front 220\nVermont:\nChamplain Valley (N.Y.) 159\nVermont 221\nVirginia:\nCentral Virginia 222\nEastern Tennessee-Southwestern Virginia (Tenn.) 207\nHampton Roads 223\nNational Capital (D.C., Md.) 47\nNortheastern Virginia 224\nState Capital 225\nValley of Virginia 226\nWashington:\nEastern Washington-Northern Idaho (Idaho) 62\nNorthern Washington 227\nOlympia-Northwest Washington 228\nPortland (Ore.) 193\nPuget Sound 229\nSouth Central Washington 230\nWest Virginia:\nAllegheny 231\nCentral West Virginia 232\nCumberland-Keyser (Md.) 113\nEastern Panhandle 233\nHuntington-Ashland-Portsmouth-Iron- ton (Ky., Ohio) 103\nKanawha Valley 234\nNorth Central West Virginia 235\nParkersburg-Marietta (Ohio) 179\nSouthern West Virginia 236\nSteubenville-Wierton-Wheeling (Ohio) 181\nWisconsin:\nDuluth-Superior (Minn.) 129\nLake Michigan 237\nMetropolitan Dubuque (Ill., Iowa) 68\nNorth Central Wisconsin 238\nRockford- Janesville- Beloit (Ill.) 73\nSoutheastern Wisconsin 239\nSoutheast Minnesota- La Crosse (Minn.) 128\nSouthern Wisconsin 240\nWyoming:\nCasper 241\nMetropolitan Cheyenne 242\nWyoming 243\nPuerto Rico:\nPuerto Rico 244\nAmerican Samoa:\nAmerican Samoa 245\nGuam:\nGuam 246\nU.S. Virgin Islands:\nU.S. Virgin Islands 247","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"5f4457a3979d3a04bc549e7598519c471fdfc1a77f6eeb7753e8fe2dbc39d75e","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-81.457","next":"us/40-cfr-82.1"},"notice":"GroundRules: Original legal text. Not legal advice."}