Home/CFR/Title 40/Part 81
FEDERAL · 40 CFR

Part 81 — Designation of Areas for Air Quality Planning Purposes

344 sections · Title 40: Protection of Environment

§ 81.1Definitions.
§ 81.11Scope.
§ 81.12National Capital Interstate Air Quality Control Region (District of Columbia, Maryland, and Virginia).
§ 81.13New Jersey-New York-Connecticut Interstate Air Quality Control Region.
§ 81.14Metropolitan Chicago Interstate Air Quality Control Region.
§ 81.15Metropolitan Philadelphia Interstate Air Quality Control Region (Pennsylvania-New Jersey-Delaware).
§ 81.16Metropolitan Denver Intrastate Air Quality Control Region.
§ 81.17Metropolitan Los Angeles Air Quality Control Region.
§ 81.18Metropolitan St. Louis Interstate Air Quality Control Region.
§ 81.19Metropolitan Boston Intrastate Air Quality Control Region.
§ 81.20Metropolitan Cincinnati Interstate Air Quality Control Region.
§ 81.21San Francisco Bay Area Intrastate Air Quality Control Region.
§ 81.22Greater Metropolitan Cleveland Intrastate Air Quality Control Region.
§ 81.23Southwest Pennsylvania Intrastate Air Quality Control Region.
§ 81.24Niagara Frontier Intrastate Air Quality Control Region.
§ 81.25Metropolitan Kansas City Interstate Air Quality Control Region.
§ 81.26Hartford-New Haven-Springfield Interstate Air Quality Control Region.
§ 81.27Minneapolis-St. Paul Intrastate Air Quality Control Region.
§ 81.28Metropolitan Baltimore Intrastate Air Quality Control Region.
§ 81.29Metropolitan Indianapolis Intrastate Air Quality Control Region.
§ 81.30Southeastern Wisconsin Intrastate Air Quality Control Region.
§ 81.31Metropolitan Providence Interstate Air Quality Control Region.
§ 81.32Puget Sound Intrastate Air Quality Control Region.
§ 81.33Steubenville-Weirton-Wheeling Interstate Air Quality Control Region.
§ 81.34Metropolitan Dayton Intrastate Air Quality Control Region.
§ 81.35Louisville Interstate Air Quality Control Region.
§ 81.36Maricopa Intrastate Air Quality Control Region.
§ 81.37Metropolitan Detroit-Port Huron Intrastate Air Quality Control Region.
§ 81.38Metropolitan Houston-Galveston Intrastate Air Quality Control Region.
§ 81.39Metropolitan Dallas-Fort Worth Intrastate Air Quality Control Region.
§ 81.40Metropolitan San Antonio Intrastate Air Quality Control Region.
§ 81.41Metropolitan Birmingham Intrastate Air Quality Control Region.
§ 81.42Chattanooga Interstate Air Quality Control Region.
§ 81.43Metropolitan Toledo Interstate Air Quality Control Region.
§ 81.44Metropolitan Memphis Interstate Air Quality Control Region.
§ 81.45Metropolitan Atlanta Intrastate Air Quality Control Region.
§ 81.46U.S. Virgin Islands Air Quality Control Region.
§ 81.47Central Oklahoma Intrastate Air Quality Control Region.
§ 81.48Champlain Valley Interstate Air Quality Control Region.
§ 81.49Southeast Florida Intrastate Air Quality Control Region.
§ 81.50Metropolitan Omaha-Council Bluffs Interstate Air Quality Control Region.
§ 81.51Portland Interstate Air Quality Control Region.
§ 81.52Wasatch Front Intrastate Air Quality Control Region.
§ 81.53Southern Louisiana-Southeast Texas Interstate Air Quality Control Region.
§ 81.54Cook Inlet Intrastate Air Quality Control Region.
§ 81.55Northeast Pennsylvania-Upper Delaware Valley Interstate Air Quality Control Region.
§ 81.57Eastern Tennessee-Southwestern Virginia Interstate Air Quality Control Region.
§ 81.58Columbus (Georgia)-Phenix City (Alabama) Interstate Air Quality Control Region.
§ 81.59Cumberland-Keyser Interstate Air Quality Control Region.
§ 81.60Duluth (Minnesota)-Superior (Wisconsin) Interstate Air Quality Control Region.
§ 81.61Evansville (Indiana)-Owensboro-Henderson (Kentucky) Interstate Air Quality Control Region.
§ 81.62Northeast Mississippi Intrastate Air Quality Control Region.
§ 81.63Metropolitan Fort Smith Interstate Air Quality Control Region.
§ 81.64Huntington (West Virginia)-Ashland (Kentucky)-Portsmouth-Ironton (Ohio) Interstate Air Quality Control Region.
§ 81.65Joplin (Missouri)-Northeast Oklahoma Interstate Air Quality Control Region.
§ 81.66Southeast Minnesota-La Crosse (Wisconsin) Interstate Air Quality Control Region.
§ 81.67Lake Michigan Intrastate Air Quality Control Region.
§ 81.68Mobile (Alabama)-Pensacola-Panama City (Florida)-Southern Mississippi Interstate Air Quality Control Region.
§ 81.69Paducah (Kentucky)-Cairo (Illinois) Interstate Air Quality Control Region.
§ 81.70Parkersburg (West Virginia)-Marietta (Ohio) Interstate Air Quality Control Region.
§ 81.71Rockford (Illinois)-Janesville-Beloit (Wisconsin) Interstate Air Quality Control Region.
§ 81.72Tennessee River Valley (Alabama)-Cumberland Mountains (Tennessee) Interstate Air Quality Control Region.
§ 81.73South Bend-Elkhart (Indiana)-Benton Harbor (Michigan) Interstate Air Quality Control Region.
§ 81.74Northwest Pennsylvania-Youngstown Interstate Air Quality Control Region.
§ 81.75Metropolitan Charlotte Interstate Air Quality Control Region.
§ 81.76State of Hawaii Air Quality Control Region.
§ 81.77Puerto Rico Air Quality Control Region.
§ 81.78Metropolitan Portland Intrastate Air Quality Control Region.
§ 81.79Northeastern Oklahoma Intrastate Air Quality Control Region.
§ 81.80Las Vegas Intrastate Air Quality Control Region.
§ 81.81Merrimack Valley-Southern New Hampshire Interstate Air Quality Control Region.
§ 81.82El Paso-Las Cruces-Alamogordo Interstate Air Quality Control Region.
§ 81.83Albuquerque-Mid Rio Grande Intrastate Air Quality Control Region.
§ 81.84Metropolitan Fargo-Moorhead Interstate Air Quality Control Region.
§ 81.85Metropolitan Sioux Falls Interstate Air Quality Control Region.
§ 81.86Metropolitan Sioux City Interstate Air Quality Control Region.
§ 81.87Metropolitan Boise Intrastate Air Quality Control Region.
§ 81.88Billings Intrastate Air Quality Control Region.
§ 81.89Metropolitan Cheyenne Intrastate Air Quality Control Region.
§ 81.90Androscoggin Valley Interstate Air Quality Control Region.
§ 81.91Jacksonville (Florida)-Brunswick (Georgia) Interstate Air Quality Control Region.
§ 81.92Monroe (Louisiana)—El Dorado (Arkansas) Interstate Air Quality Control Region.
§ 81.93Hampton Roads Intrastate Air Quality Control Region.
§ 81.94Shreveport-Texarkana-Tyler Interstate Air Quality Control Region.
§ 81.95Central Florida Intrastate Air Quality Control Region.
§ 81.96West Central Florida Intrastate Air Quality Control Region.
§ 81.97Southwest Florida Intrastate Air Quality Control Region.
§ 81.98Burlington-Keokuk Interstate Air Quality Control Region.
§ 81.99New Mexico Southern Border Intrastate Air Quality Control Region.
§ 81.100Eastern Washington-Northern Idaho Interstate Air Quality Control Region.
§ 81.101Metropolitan Dubuque Interstate Air Quality Control Region.
§ 81.102Metropolitan Quad Cities Interstate Air Quality Control Region.
§ 81.104Central Pennsylvania Intrastate Air Quality Control Region.
§ 81.105South Central Pennsylvania Intrastate Air Quality Control Region.
§ 81.106Greenville-Spartanburg Intrastate Air Quality Control Region.
§ 81.107Greenwood Intrastate Air Quality Control Region.
§ 81.108Columbia Intrastate Air Quality Control Region.
§ 81.109Florence Intrastate Air Quality Control Region.
§ 81.110Camden-Sumter Intrastate Air Quality Control Region.
§ 81.111Georgetown Intrastate Air Quality Control Region.
§ 81.112Charleston Intrastate Air Quality Control Region.
§ 81.113Savannah (Georgia)-Beaufort (South Carolina) Interstate Air Quality Control Region.
§ 81.114Augusta (Georgia)-Aiken (South Carolina) Interstate Air Quality Control Region.
§ 81.115Northwest Nevada Intrastate Air Quality Control Region.
§ 81.116Northern Missouri Intrastate Air Quality Control Region.
§ 81.117Southeast Missouri Intrastate Air Quality Control Region.
§ 81.118Southwest Missouri Intrastate Air Quality Control Region.
§ 81.119Western Tennessee Intrastate Air Quality Control Region.
§ 81.120Middle Tennessee Intrastate Air Quality Control Region.
§ 81.121Four Corners Interstate Air Quality Control Region.
§ 81.122Mississippi Delta Intrastate Air Quality Control Region.
§ 81.123Southeastern Oklahoma Intrastate Air Quality Control Region.
§ 81.124North Central Oklahoma Intrastate Air Quality Control Region.
§ 81.125Southwestern Oklahoma Intrastate Air Quality Control Region.
§ 81.126Northwestern Oklahoma Intrastate Air Quality Control Region.
§ 81.127Central New York Intrastate Air Quality Control Region.
§ 81.128Genesee-Finger Lakes Intrastate Air Quality Control Region.
§ 81.129Hudson Valley Intrastate Air Quality Control Region.
§ 81.130Southern Tier East Intrastate Air Quality Control Region.
§ 81.131Southern Tier West Intrastate Air Quality Control Region.
§ 81.132Abilene-Wichita Falls Intrastate Air Quality Control Region.
§ 81.133Amarillo-Lubbock Intrastate Air Quality Control Region.
§ 81.134Austin-Waco Intrastate Air Quality Control Region.
§ 81.135Brownsville-Laredo Intrastate Air Quality Control Region.
§ 81.136Corpus Christi-Victoria Intrastate Air Quality Control Region.
§ 81.137Midland-Odessa-San Angelo Intrastate Air Quality Control Region.
§ 81.138Central Arkansas Intrastate Air Quality Control Region.
§ 81.139Northeast Arkansas Intrastate Air Quality Control Region.
§ 81.140Northwest Arkansas Intrastate Air Quality Control Region.
§ 81.141Berkshire Intrastate Air Quality Control Region.
§ 81.142Central Massachusetts Intrastate Air Quality Control Region.
§ 81.143Central Virginia Intrastate Air Quality Control Region.
§ 81.144Northeastern Virginia Intrastate Air Quality Control Region.
§ 81.145State Capital Intrastate Air Quality Control Region.
§ 81.146Valley of Virginia Intrastate Air Quality Control Region.
§ 81.147Eastern Mountain Intrastate Air Quality Control Region.
§ 81.148Eastern Piedmont Intrastate Air Quality Control Region.
§ 81.149Northern Coastal Plain Intrastate Air Quality Control Region.
§ 81.150Northern Piedmont Intrastate Air Quality Control Region.
§ 81.151Sandhills Intrastate Air Quality Control Region.
§ 81.152Southern Coastal Plain Intrastate Air Quality Control Region.
§ 81.153Western Mountain Intrastate Air Quality Control Region.
§ 81.154Eastern Shore Intrastate Air Quality Control Region.
§ 81.155Central Maryland Intrastate Air Quality Control Region.
§ 81.156Southern Maryland Intrastate Air Quality Control Region.
§ 81.157North Central Wisconsin Intrastate Air Quality Control Region.
§ 81.158Southern Wisconsin Intrastate Air Quality Control Region.
§ 81.159Great Basin Valley Intrastate Air Quality Control Region.
§ 81.160North Central Coast Intrastate Air Quality Control Region.
§ 81.161North Coast Intrastate Air Quality Control Region.
§ 81.162Northeast Plateau Intrastate Air Quality Control Region.
§ 81.163Sacramento Valley Intrastate Air Quality Control Region.
§ 81.164San Diego Intrastate Air Quality Control Region.
§ 81.165San Joaquin Valley Intrastate Air Quality Control Region.
§ 81.166South Central Coast Intrastate Air Quality Control Region.
§ 81.167Southeast Desert Intrastate Air Quality Control Region.
§ 81.168Great Falls Intrastate Air Quality Control Region.
§ 81.169Helena Intrastate Air Quality Control Region.
§ 81.170Miles City Intrastate Air Quality Control Region.
§ 81.171Missoula Intrastate Air Quality Control Region.
§ 81.172Comanche Intrastate Air Quality Control Region.
§ 81.173Grand Mesa Intrastate Air Quality Control Region.
§ 81.174Pawnee Intrastate Air Quality Control Region.
§ 81.175San Isabel Intrastate Air Quality Control Region.
§ 81.176San Luis Intrastate Air Quality Control Region.
§ 81.177Yampa Intrastate Air Quality Control Region.
§ 81.178Southern Delaware Intrastate Air Quality Control Region.
§ 81.179Aroostook Intrastate Air Quality Control Region.
§ 81.181Down East Intrastate Air Quality Control Region.
§ 81.182Northwest Maine Intrastate Air Quality Control Region.
§ 81.183Eastern Connecticut Intrastate Air Quality Control Region.
§ 81.184Northwestern Connecticut Intrastate Air Quality Control Region.
§ 81.185Northern Washington Intrastate Air Quality Control Region.
§ 81.187Olympic-Northwest Washington Intrastate Air Quality Control Region.
§ 81.189South Central Washington Intrastate Air Quality Control Region.
§ 81.190Eastern Idaho Intrastate Air Quality Control Region.
§ 81.191Appalachian Intrastate Air Quality Control Region.
§ 81.192Bluegrass Intrastate Air Quality Control Region.
§ 81.193North Central Kentucky Intrastate Air Quality Control Region.
§ 81.194South Central Kentucky Intrastate Air Quality Control Region.
§ 81.195Central Michigan Intrastate Air Quality Control Region.
§ 81.196South Central Michigan Intrastate Air Quality Control Region.
§ 81.197Upper Michigan Intrastate Air Quality Control Region.
§ 81.199East Alabama Intrastate Air Quality Control Region.
§ 81.200Metropolitan Columbus Intrastate Air Quality Control Region.
§ 81.201Mansfield-Marion Intrastate Air Quality Control Region.
§ 81.202Northwest Ohio Intrastate Air Quality Control Region.
§ 81.203Sandusky Intrastate Air Quality Control Region.
§ 81.204Wilmington-Chillicothe-Logan Intrastate Air Quality Control Region.
§ 81.205Zanesville-Cambridge Intrastate Air Quality Control Region.
§ 81.213Casper Intrastate Air Quality Control Region.
§ 81.214Black Hills-Rapid City Intrastate Air Quality Control Region.
§ 81.215East Central Indiana Intrastate Air Quality Control Region.
§ 81.216Northeast Indiana Intrastate Air Quality Control Region.
§ 81.217Southern Indiana Intrastate Air Quality Control Region.
§ 81.218Wabash Valley Intrastate Air Quality Control Region.
§ 81.219Central Oregon Intrastate Air Quality Control Region.
§ 81.220Eastern Oregon Intrastate Air Quality Control Region.
§ 81.221Southwest Oregon Intrastate Air Quality Control Region.
§ 81.226Lincoln-Beatrice-Fairbury Intrastate Air Quality Control Region.
§ 81.230Allegheny Intrastate Air Quality Control Region.
§ 81.231Central West Virginia Intrastate Air Quality Control Region.
§ 81.232Eastern Panhandle Intrastate Air Quality Control Region.
§ 81.233Kanawha Valley Intrastate Air Quality Control Region.
§ 81.234North Central West Virginia Intrastate Air Quality Control Region.
§ 81.235Southern West Virginia Intrastate Air Quality Control Region.
§ 81.236Central Georgia Intrastate Air Quality Control Region.
§ 81.237Northeast Georgia Intrastate Air Quality Control Region.
§ 81.238Southwest Georgia Intrastate Air Quality Control Region.
§ 81.239Upper Rio Grande Valley Intrastate Air Quality Control Region.
§ 81.240Northeastern Plains Intrastate Air Quality Control Region.
§ 81.241Southwestern Mountains-Augustine Plains Intrastate Air Quality Control Region.
§ 81.242Pecos-Permian Basin Intrastate Air Quality Control Region.
§ 81.243Central Minnesota Intrastate Air Quality Control Region.
§ 81.244Northwest Minnesota Intrastate Air Quality Control Region.
§ 81.245Southwest Minnesota Intrastate Air Quality Control Region.
§ 81.246Northern Alaska Intrastate Air Quality Control Region.
§ 81.247South Central Alaska Intrastate Air Quality Control Region.
§ 81.248Southeastern Alaska Intrastate Air Quality Control Region.
§ 81.249Northwest Oregon Intrastate Air Quality Control Region.
§ 81.250North Central Kansas Intrastate Air Quality Control Region.
§ 81.251Northeast Kansas Intrastate Air Quality Control Region.
§ 81.252Northwest Kansas Intrastate Air Quality Control Region.
§ 81.253South Central Kansas Intrastate Air Quality Control Region.
§ 81.254Southeast Kansas Intrastate Air Quality Control Region.
§ 81.255Southwest Kansas Intrastate Air Quality Control Region.
§ 81.256Northeast Iowa Intrastate Air Quality Control Region.
§ 81.257North Central Iowa Intrastate Air Quality Control Region.
§ 81.258Northwest Iowa Intrastate Air Quality Control Region.
§ 81.259Southwest Iowa Intrastate Air Quality Control Region.
§ 81.260South Central Iowa Intrastate Air Quality Control Region.
§ 81.261Southeast Iowa Intrastate Air Quality Control Region.
§ 81.262North Central Illinois Intrastate Air Quality Control Region.
§ 81.263East Central Illinois Intrastate Air Quality Control Region.
§ 81.264West Central Illinois Intrastate Air Quality Control Region.
§ 81.265Southeast Illinois Intrastate Air Quality Control Region.
§ 81.266Alabama and Tombigbee Rivers Intrastate Air Quality Control Region.
§ 81.267Southeast Alabama Intrastate Air Quality Control Region.
§ 81.268Mohave-Yuma Intrastate Air Quality Control Region.
§ 81.269Pima Intrastate Air Quality Control Region.
§ 81.270Northern Arizona Intrastate Air Quality Control Region.
§ 81.271Central Arizona Intrastate Air Quality Control Region.
§ 81.272Southeast Arizona Intrastate Air Quality Control Region.
§ 81.273Lake County Intrastate Air Quality Control Region.
§ 81.274Mountain Counties Intrastate Air Quality Control Region.
§ 81.275Lake Tahoe Intrastate Air Quality Control Region.
§ 81.276Nevada Intrastate Air Quality Control Region.
§ 81.300Scope.
§ 81.301Alabama.
§ 81.302Alaska.
§ 81.303Arizona.
§ 81.304Arkansas.
§ 81.305California.
§ 81.306Colorado.
§ 81.307Connecticut.
§ 81.308Delaware.
§ 81.309District of Columbia.
§ 81.310Florida.
§ 81.311Georgia.
§ 81.312Hawaii.
§ 81.313Idaho.
§ 81.314Illinois.
§ 81.315Indiana.
§ 81.316Iowa.
§ 81.317Kansas.
§ 81.318Kentucky.
§ 81.319Louisiana.
§ 81.320Maine.
§ 81.321Maryland.
§ 81.322Massachusetts.
§ 81.323Michigan.
§ 81.324Minnesota.
§ 81.325Mississippi.
§ 81.326Missouri.
§ 81.327Montana.
§ 81.328Nebraska.
§ 81.329Nevada.
§ 81.330New Hampshire.
§ 81.331New Jersey.
§ 81.332New Mexico.
§ 81.333New York.
§ 81.334North Carolina.
§ 81.335North Dakota.
§ 81.336Ohio.
§ 81.337Oklahoma.
§ 81.338Oregon.
§ 81.339Pennsylvania.
§ 81.340Rhode Island.
§ 81.341South Carolina.
§ 81.342South Dakota.
§ 81.343Tennessee.
§ 81.344Texas.
§ 81.345Utah.
§ 81.346Vermont.
§ 81.347Virginia.
§ 81.348Washington.
§ 81.349West Virginia.
§ 81.350Wisconsin.
§ 81.351Wyoming.
§ 81.352American Samoa.
§ 81.353Guam.
§ 81.354Northern Mariana Islands.
§ 81.355Puerto Rico.
§ 81.356Virgin Islands.
§ 81.400Scope.
§ 81.401Alabama.
§ 81.402Alaska.
§ 81.403Arizona.
§ 81.404Arkansas.
§ 81.405California.
§ 81.406Colorado.
§ 81.407Florida.
§ 81.408Georgia.
§ 81.409Hawaii.
§ 81.410Idaho.
§ 81.411Kentucky.
§ 81.412Louisiana.
§ 81.413Maine.
§ 81.414Michigan.
§ 81.415Minnesota.
§ 81.416Missouri.
§ 81.417Montana.
§ 81.418Nevada.
§ 81.419New Hampshire.
§ 81.420New Jersey.
§ 81.421New Mexico.
§ 81.422North Carolina.
§ 81.423North Dakota.
§ 81.424Oklahoma.
§ 81.425Oregon.
§ 81.426South Carolina.
§ 81.427South Dakota.
§ 81.428Tennessee.
§ 81.429Texas.
§ 81.430Utah.
§ 81.431Vermont.
§ 81.432Virgin Islands.
§ 81.433Virginia.
§ 81.434Washington.
§ 81.435West Virginia.
§ 81.436Wyoming.
§ 81.437New Brunswick, Canada.
§ 81.455Scope.
§ 81.457Ozone Transport Region.