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Home Page > Executive Branch > Code of Federal Regulations > Electronic Code of Federal Regulations
e-CFR Data is current as of November 19, 2009
TITLE 40--Protection of Environment
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER C--AIR PROGRAMS
PART 81--DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES
Subpart A--MEANING OF TERMS
Subpart B--DESIGNATION OF AIR QUALITY CONTROL REGIONS
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| National Capital Interstate Air Quality Control Region (District of Columbia, Maryland, and Virginia). |
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| New Jersey-New York-Connecticut Interstate Air Quality Control Region. |
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| Metropolitan Chicago Interstate Air Quality Control Region. |
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| Metropolitan Philadelphia Interstate Air Quality Control Region (Pennsylvania-New Jersey-Delaware). |
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| Metropolitan Denver Intrastate Air Quality Control Region. |
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| Metropolitan Los Angeles Air Quality Control Region. |
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| Metropolitan St. Louis Interstate Air Quality Control Region. |
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| Metropolitan Boston Intrastate Air Quality Control Region. |
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| Metropolitan Cincinnati Interstate Air Quality Control Region. |
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| San Francisco Bay Area Intrastate Air Quality Control Region. |
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| Greater Metropolitan Cleveland Intrastate Air Quality Control Region. |
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| Southwest Pennsylvania Intrastate Air Quality Control Region. |
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| Niagara Frontier Intrastate Air Quality Control Region. |
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| Metropolitan Kansas City Interstate Air Quality Control Region. |
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| Hartford-New Haven-Springfield Interstate Air Quality Control Region. |
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| Minneapolis-St. Paul Intrastate Air Quality Control Region. |
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| Metropolitan Baltimore Intrastate Air Quality Control Region. |
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| Metropolitan Indianapolis Intrastate Air Quality Control Region. |
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| Southeastern Wisconsin Intrastate Air Quality Control Region. |
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| Metropolitan Providence Interstate Air Quality Control Region. |
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| Puget Sound Intrastate Air Quality Control Region. |
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| Steubenville-Weirton-Wheeling Interstate Air Quality Control Region. |
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| Metropolitan Dayton Intrastate Air Quality Control Region. |
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| Louisville Interstate Air Quality Control Region. |
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| Maricopa Intrastate Air Quality Control Region. |
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| Metropolitan Detroit-Port Huron Intrastate Air Quality Control Region. |
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| Metropolitan Houston-Galveston Intrastate Air Quality Control Region. |
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| Metropolitan Dallas-Fort Worth Intrastate Air Quality Control Region. |
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| Metropolitan San Antonio Intrastate Air Quality Control Region. |
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| Metropolitan Birmingham Intrastate Air Quality Control Region. |
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| Chattanooga Interstate Air Quality Control Region. |
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| Metropolitan Toledo Interstate Air Quality Control Region. |
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| Metropolitan Memphis Interstate Air Quality Control Region. |
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| Metropolitan Atlanta Intrastate Air Quality Control Region. |
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| U.S. Virgin Islands Air Quality Control Region. |
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| Central Oklahoma Intrastate Air Quality Control Region. |
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| Champlain Valley Interstate Air Quality Control Region. |
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| Southeast Florida Intrastate Air Quality Control Region. |
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| Metropolitan Omaha-Council Bluffs Interstate Air Quality Control Region. |
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| Portland Interstate Air Quality Control Region. |
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| Wasatch Front Intrastate Air Quality Control Region. |
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| Southern Louisiana-Southeast Texas Interstate Air Quality Control Region. |
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| Cook Inlet Intrastate Air Quality Control Region. |
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| Northeast Pennsylvania-Upper Delaware Valley Interstate Air Quality Control Region. |
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| Eastern Tennessee-Southwestern Virginia Interstate Air Quality Control Region. |
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| Columbus (Georgia)-Phenix City (Alabama) Interstate Air Quality Control Region. |
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| Cumberland-Keyser Interstate Air Quality Control Region. |
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| Duluth (Minnesota)-Superior (Wisconsin) Interstate Air Quality Control Region. |
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| Evansville (Indiana)-Owensboro-Henderson (Kentucky) Interstate Air Quality Control Region. |
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| Northeast Mississippi Intrastate Air Quality Control Region. |
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| Metropolitan Fort Smith Interstate Air Quality Control Region. |
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| Huntington (West Virginia)-Ashland (Kentucky)-Portsmouth-Ironton (Ohio) Interstate Air Quality Control Region. |
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| Joplin (Missouri)-Northeast Oklahoma Interstate Air Quality Control Region. |
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| Southeast Minnesota-La Crosse (Wisconsin) Interstate Air Quality Control Region. |
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| Lake Michigan Intrastate Air Quality Control Region. |
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| Mobile (Alabama)-Pensacola-Panama City (Florida)-Southern Mississippi Interstate Air Quality Control Region. |
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| Paducah (Kentucky)-Cairo (Illinois) Interstate Air Quality Control Region. |
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| Parkersburg (West Virginia)-Marietta (Ohio) Interstate Air Quality Control Region. |
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| Rockford (Illinois)-Janesville-Beloit (Wisconsin) Interstate Air Quality Control Region. |
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| Tennessee River Valley (Alabama)-Cumberland Mountains (Tennessee) Interstate Air Quality Control Region. |
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| South Bend-Elkhart (Indiana)-Benton Harbor (Michigan) Interstate Air Quality Control Region. |
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| Northwest Pennsylvania-Youngstown Interstate Air Quality Control Region. |
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| Metropolitan Charlotte Interstate Air Quality Control Region. |
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| State of Hawaii Air Quality Control Region. |
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| Puerto Rico Air Quality Control Region. |
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| Metropolitan Portland Intrastate Air Quality Control Region. |
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| Northeastern Oklahoma Intrastate Air Quality Control Region. |
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| Las Vegas Intrastate Air Quality Control Region. |
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| Merrimack Valley-Southern New Hampshire Interstate Air Quality Control Region. |
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| El Paso-Las Cruces-Alamogordo Interstate Air Quality Control Region. |
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| Albuquerque-Mid Rio Grande Intrastate Air Quality Control Region. |
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| Metropolitan Fargo-Moorhead Interstate Air Quality Control Region. |
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| Metropolitan Sioux Falls Interstate Air Quality Control Region. |
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| Metropolitan Sioux City Interstate Air Quality Control Region. |
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| Metropolitan Boise Intrastate Air Quality Control Region. |
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| Billings Intrastate Air Quality Control Region. |
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| Metropolitan Cheyenne Intrastate Air Quality Control Region. |
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| Androscoggin Valley Interstate Air Quality Control Region. |
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| Jacksonville (Florida)-Brunswick (Georgia) Interstate Air Quality Control Region. |
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| Monroe (Louisiana)--El Dorado (Arkansas) Interstate Air Quality Control Region. |
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| Hampton Roads Intrastate Air Quality Control Region. |
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| Shreveport-Texarkana-Tyler Interstate Air Quality Control Region. |
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| Central Florida Intrastate Air Quality Control Region. |
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| West Central Florida Intrastate Air Quality Control Region. |
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| Southwest Florida Intrastate Air Quality Control Region. |
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| Burlington-Keokuk Interstate Air Quality Control Region. |
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| New Mexico Southern Border Intrastate Air Quality Control Region. |
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| Eastern Washington-Northern Idaho Interstate Air Quality Control Region. |
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| Metropolitan Dubuque Interstate Air Quality Control Region. |
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| Metropolitan Quad Cities Interstate Air Quality Control Region. |
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| Central Pennsylvania Intrastate Air Quality Control Region. |
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| South Central Pennsylvania Intrastate Air Quality Control Region. |
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| Greenville-Spartanburg Intrastate Air Quality Control Region. |
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| Greenwood Intrastate Air Quality Control Region. |
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| Columbia Intrastate Air Quality Control Region. |
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| Florence Intrastate Air Quality Control Region. |
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| Camden-Sumter Intrastate Air Quality Control Region. |
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| Georgetown Intrastate Air Quality Control Region. |
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| Charleston Intrastate Air Quality Control Region. |
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| Savannah (Georgia)-Beaufort (South Carolina) Interstate Air Quality Control Region. |
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| Augusta (Georgia)-Aiken (South Carolina) Interstate Air Quality Control Region. |
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| Northwest Nevada Intrastate Air Quality Control Region. |
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| Northern Missouri Intrastate Air Quality Control Region. |
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| Southeast Missouri Intrastate Air Quality Control Region. |
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| Southwest Missouri Intrastate Air Quality Control Region. |
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| Western Tennessee Intrastate Air Quality Control Region. |
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| Middle Tennessee Intrastate Air Quality Control Region. |
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| Four Corners Interstate Air Quality Control Region. |
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| Mississippi Delta Intrastate Air Quality Control Region. |
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| Southeastern Oklahoma Intrastate Air Quality Control Region. |
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| North Central Oklahoma Intrastate Air Quality Control Region. |
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| Southwestern Oklahoma Intrastate Air Quality Control Region. |
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| Northwestern Oklahoma Intrastate Air Quality Control Region. |
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| Central New York Intrastate Air Quality Control Region. |
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| Genesee-Finger Lakes Intrastate Air Quality Control Region. |
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| Hudson Valley Intrastate Air Quality Control Region. |
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| Southern Tier East Intrastate Air Quality Control Region. |
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| Southern Tier West Intrastate Air Quality Control Region. |
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| Abilene-Wichita Falls Intrastate Air Quality Control Region. |
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| Amarillo-Lubbock Intrastate Air Quality Control Region. |
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| Austin-Waco Intrastate Air Quality Control Region. |
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| Brownsville-Laredo Intrastate Air Quality Control Region. |
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| Corpus Christi-Victoria Intrastate Air Quality Control Region. |
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| Midland-Odessa-San Angelo Intrastate Air Quality Control Region. |
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| Central Arkansas Intrastate Air Quality Control Region. |
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| Northeast Arkansas Intrastate Air Quality Control Region. |
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| Northwest Arkansas Intrastate Air Quality Control Region. |
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| Berkshire Intrastate Air Quality Control Region. |
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| Central Massachusetts Intrastate Air Quality Control Region. |
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| Central Virginia Intrastate Air Quality Control Region. |
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| Northeastern Virginia Intrastate Air Quality Control Region. |
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| State Capital Intrastate Air Quality Control Region. |
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| Valley of Virginia Intrastate Air Quality Control Region. |
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| Eastern Mountain Intrastate Air Quality Control Region. |
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| Eastern Piedmont Intrastate Air Quality Control Region. |
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| Northern Coastal Plain Intrastate Air Quality Control Region. |
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| Northern Piedmont Intrastate Air Quality Control Region. |
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| Sandhills Intrastate Air Quality Control Region. |
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| Southern Coastal Plain Intrastate Air Quality Control Region. |
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| Western Mountain Intrastate Air Quality Control Region. |
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| Eastern Shore Intrastate Air Quality Control Region. |
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| Central Maryland Intrastate Air Quality Control Region. |
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| Southern Maryland Intrastate Air Quality Control Region. |
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| North Central Wisconsin Intrastate Air Quality Control Region. |
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| Southern Wisconsin Intrastate Air Quality Control Region. |
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| Great Basin Valley Intrastate Air Quality Control Region. |
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| North Central Coast Intrastate Air Quality Control Region. |
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| North Coast Intrastate Air Quality Control Region. |
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| Northeast Plateau Intrastate Air Quality Control Region. |
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| Sacramento Valley Intrastate Air Quality Control Region. |
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| San Diego Intrastate Air Quality Control Region. |
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| San Joaquin Valley Intrastate Air Quality Control Region. |
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| South Central Coast Intrastate Air Quality Control Region. |
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| Southeast Desert Intrastate Air Quality Control Region. |
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| Great Falls Intrastate Air Quality Control Region. |
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| Helena Intrastate Air Quality Control Region. |
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| Miles City Intrastate Air Quality Control Region. |
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| Missoula Intrastate Air Quality Control Region. |
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| Comanche Intrastate Air Quality Control Region. |
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| Grand Mesa Intrastate Air Quality Control Region. |
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| Pawnee Intrastate Air Quality Control Region. |
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| San Isabel Intrastate Air Quality Control Region. |
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| San Luis Intrastate Air Quality Control Region. |
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| Yampa Intrastate Air Quality Control Region. |
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| Southern Delaware Intrastate Air Quality Control Region. |
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| Aroostook Intrastate Air Quality Control Region. |
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| Down East Intrastate Air Quality Control Region. |
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| Northwest Maine Intrastate Air Quality Control Region. |
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| Eastern Connecticut Intrastate Air Quality Control Region. |
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| Northwestern Connecticut Intrastate Air Quality Control Region. |
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| Northern Washington Intrastate Air Quality Control Region. |
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| Olympic-Northwest Washington Intrastate Air Quality Control Region. |
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| South Central Washington Intrastate Air Quality Control Region. |
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| Eastern Idaho Intrastate Air Quality Control Region. |
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| Appalachian Intrastate Air Quality Control Region. |
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| Bluegrass Intrastate Air Quality Control Region. |
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| North Central Kentucky Intrastate Air Quality Control Region. |
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| South Central Kentucky Intrastate Air Quality Control Region. |
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| Central Michigan Intrastate Air Quality Control Region. |
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| South Central Michigan Intrastate Air Quality Control Region. |
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| Upper Michigan Intrastate Air Quality Control Region. |
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| East Alabama Intrastate Air Quality Control Region. |
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| Metropolitan Columbus Intrastate Air Quality Control Region. |
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| Mansfield-Marion Intrastate Air Quality Control Region. |
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| Northwest Ohio Intrastate Air Quality Control Region. |
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| Sandusky Intrastate Air Quality Control Region. |
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| Wilmington-Chillicothe-Logan Intrastate Air Quality Control Region. |
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| Zanesville-Cambridge Intrastate Air Quality Control Region. |
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| Casper Intrastate Air Quality Control Region. |
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| Black Hills-Rapid City Intrastate Air Quality Control Region. |
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| East Central Indiana Intrastate Air Quality Control Region. |
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| Northeast Indiana Intrastate Air Quality Control Region. |
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| Southern Indiana Intrastate Air Quality Control Region. |
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| Wabash Valley Intrastate Air Quality Control Region. |
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| Central Oregon Intrastate Air Quality Control Region. |
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| Eastern Oregon Intrastate Air Quality Control Region. |
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| Southwest Oregon Intrastate Air Quality Control Region. |
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| Lincoln-Beatrice-Fairbury Intrastate Air Quality Control Region. |
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| Allegheny Intrastate Air Quality Control Region. |
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| Central West Virginia Intrastate Air Quality Control Region. |
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| Eastern Panhandle Intrastate Air Quality Control Region. |
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| Kanawha Valley Intrastate Air Quality Control Region. |
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| North Central West Virginia Intrastate Air Quality Control Region. |
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| Southern West Virginia Intrastate Air Quality Control Region. |
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| Central Georgia Intrastate Air Quality Control Region. |
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| Northeast Georgia Intrastate Air Quality Control Region. |
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| Southwest Georgia Intrastate Air Quality Control Region. |
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| Upper Rio Grande Valley Intrastate Air Quality Control Region. |
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| Northeastern Plains Intrastate Air Quality Control Region. |
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| Southwestern Mountains-Augustine Plains Intrastate Air Quality Control Region. |
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| Pecos-Permian Basin Intrastate Air Quality Control Region. |
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| Central Minnesota Intrastate Air Quality Control Region. |
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| Northwest Minnesota Intrastate Air Quality Control Region. |
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| Southwest Minnesota Intrastate Air Quality Control Region. |
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| Northern Alaska Intrastate Air Quality Control Region. |
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| South Central Alaska Intrastate Air Quality Control Region. |
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| Southeastern Alaska Intrastate Air Quality Control Region. |
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| Northwest Oregon Intrastate Air Quality Control Region. |
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| North Central Kansas Intrastate Air Quality Control Region. |
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| Northeast Kansas Intrastate Air Quality Control Region. |
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| Northwest Kansas Intrastate Air Quality Control Region. |
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| South Central Kansas Intrastate Air Quality Control Region. |
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| Southeast Kansas Intrastate Air Quality Control Region. |
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| Southwest Kansas Intrastate Air Quality Control Region. |
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| Northeast Iowa Intrastate Air Quality Control Region. |
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| North Central Iowa Intrastate Air Quality Control Region. |
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| Northwest Iowa Intrastate Air Quality Control Region. |
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| Southwest Iowa Intrastate Air Quality Control Region. |
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| South Central Iowa Intrastate Air Quality Control Region. |
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| Southeast Iowa Intrastate Air Quality Control Region. |
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| North Central Illinois Intrastate Air Quality Control Region. |
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| East Central Illinois Intrastate Air Quality Control Region. |
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| West Central Illinois Intrastate Air Quality Control Region. |
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| Southeast Illinois Intrastate Air Quality Control Region. |
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| Alabama and Tombigbee Rivers Intrastate Air Quality Control Region. |
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| Southeast Alabama Intrastate Air Quality Control Region. |
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| Mohave-Yuma Intrastate Air Quality Control Region. |
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| Pima Intrastate Air Quality Control Region. |
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| Northern Arizona Intrastate Air Quality Control Region. |
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| Central Arizona Intrastate Air Quality Control Region. |
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| Southeast Arizona Intrastate Air Quality Control Region. |
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| Lake County Intrastate Air Quality Control Region. |
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| Mountain Counties Intrastate Air Quality Control Region. |
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| Lake Tahoe Intrastate Air Quality Control Region. |
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Subpart C--SECTION 107 ATTAINMENT STATUS DESIGNATIONS
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| Northern Mariana Islands. |
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Subpart D--IDENTIFICATION OF MANDATORY CLASS I FEDERAL AREAS WHERE VISIBILITY IS AN IMPORTANT VALUE
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