Title 40 -- Protection of Environment
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PART 81 -- DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES

   
Subpart A -- Meaning of Terms

      §81.1 Definitions.
   
Subpart B -- Designation of Air Quality Control Regions

      §81.11 Scope.
      §81.12 National Capital Interstate Air Quality Control Region (District of Columbia, Maryland, and Virginia).
      §81.13 New Jersey-New York-Connecticut Interstate Air Quality Control Region.
      §81.14 Metropolitan Chicago Interstate Air Quality Control Region.
      §81.15 Metropolitan Philadelphia Interstate Air Quality Control Region (Pennsylvania-New Jersey-Delaware).
      §81.16 Metropolitan Denver Intrastate Air Quality Control Region.
      §81.17 Metropolitan Los Angeles Air Quality Control Region.
      §81.18 Metropolitan St. Louis Interstate Air Quality Control Region.
      §81.19 Metropolitan Boston Intrastate Air Quality Control Region.
      §81.20 Metropolitan Cincinnati Interstate Air Quality Control Region.
      §81.21 San Francisco Bay Area Intrastate Air Quality Control Region.
      §81.22 Greater Metropolitan Cleveland Intrastate Air Quality Control Region.
      §81.23 Southwest Pennsylvania Intrastate Air Quality Control Region.
      §81.24 Niagara Frontier Intrastate Air Quality Control Region.
      §81.25 Metropolitan Kansas City Interstate Air Quality Control Region.
      §81.26 Hartford-New Haven-Springfield Interstate Air Quality Control Region.
      §81.27 Minneapolis-St. Paul Intrastate Air Quality Control Region.
      §81.28 Metropolitan Baltimore Intrastate Air Quality Control Region.
      §81.29 Metropolitan Indianapolis Intrastate Air Quality Control Region.
      §81.30 Southeastern Wisconsin Intrastate Air Quality Control Region.
      §81.31 Metropolitan Providence Interstate Air Quality Control Region.
      §81.32 Puget Sound Intrastate Air Quality Control Region.
      §81.33 Steubenville-Weirton-Wheeling Interstate Air Quality Control Region.
      §81.34 Metropolitan Dayton Intrastate Air Quality Control Region.
      §81.35 Louisville Interstate Air Quality Control Region.
      §81.36 Maricopa Intrastate Air Quality Control Region.
      §81.37 Metropolitan Detroit-Port Huron Intrastate Air Quality Control Region.
      §81.38 Metropolitan Houston-Galveston Intrastate Air Quality Control Region.
      §81.39 Metropolitan Dallas-Fort Worth Intrastate Air Quality Control Region.
      §81.40 Metropolitan San Antonio Intrastate Air Quality Control Region.
      §81.41 Metropolitan Birmingham Intrastate Air Quality Control Region.
      §81.42 Chattanooga Interstate Air Quality Control Region.
      §81.43 Metropolitan Toledo Interstate Air Quality Control Region.
      §81.44 Metropolitan Memphis Interstate Air Quality Control Region.
      §81.45 Metropolitan Atlanta Intrastate Air Quality Control Region.
      §81.46 U.S. Virgin Islands Air Quality Control Region.
      §81.47 Central Oklahoma Intrastate Air Quality Control Region.
      §81.48 Champlain Valley Interstate Air Quality Control Region.
      §81.49 Southeast Florida Intrastate Air Quality Control Region.
      §81.50 Metropolitan Omaha-Council Bluffs Interstate Air Quality Control Region.
      §81.51 Portland Interstate Air Quality Control Region.
      §81.52 Wasatch Front Intrastate Air Quality Control Region.
      §81.53 Southern Louisiana-Southeast Texas Interstate Air Quality Control Region.
      §81.54 Cook Inlet Intrastate Air Quality Control Region.
      §81.55 Northeast Pennsylvania-Upper Delaware Valley Interstate Air Quality Control Region.
      §81.57 Eastern Tennessee-Southwestern Virginia Interstate Air Quality Control Region.
      §81.58 Columbus (Georgia)-Phenix City (Alabama) Interstate Air Quality Control Region.
      §81.59 Cumberland-Keyser Interstate Air Quality Control Region.
      §81.60 Duluth (Minnesota)-Superior (Wisconsin) Interstate Air Quality Control Region.
      §81.61 Evansville (Indiana)-Owensboro-Henderson (Kentucky) Interstate Air Quality Control Region.
      §81.62 Northeast Mississippi Intrastate Air Quality Control Region.
      §81.63 Metropolitan Fort Smith Interstate Air Quality Control Region.
      §81.64 Huntington (West Virginia)-Ashland (Kentucky)-Portsmouth-Ironton (Ohio) Interstate Air Quality Control Region.
      §81.65 Joplin (Missouri)-Northeast Oklahoma Interstate Air Quality Control Region.
      §81.66 Southeast Minnesota-La Crosse (Wisconsin) Interstate Air Quality Control Region.
      §81.67 Lake Michigan Intrastate Air Quality Control Region.
      §81.68 Mobile (Alabama)-Pensacola-Panama City (Florida)-Southern Mississippi Interstate Air Quality Control Region.
      §81.69 Paducah (Kentucky)-Cairo (Illinois) Interstate Air Quality Control Region.
      §81.70 Parkersburg (West Virginia)-Marietta (Ohio) Interstate Air Quality Control Region.
      §81.71 Rockford (Illinois)-Janesville-Beloit (Wisconsin) Interstate Air Quality Control Region.
      §81.72 Tennessee River Valley (Alabama)-Cumberland Mountains (Tennessee) Interstate Air Quality Control Region.
      §81.73 South Bend-Elkhart (Indiana)-Benton Harbor (Michigan) Interstate Air Quality Control Region.
      §81.74 Northwest Pennsylvania-Youngstown Interstate Air Quality Control Region.
      §81.75 Metropolitan Charlotte Interstate Air Quality Control Region.
      §81.76 State of Hawaii Air Quality Control Region.
      §81.77 Puerto Rico Air Quality Control Region.
      §81.78 Metropolitan Portland Intrastate Air Quality Control Region.
      §81.79 Northeastern Oklahoma Intrastate Air Quality Control Region.
      §81.80 Las Vegas Intrastate Air Quality Control Region.
      §81.81 Merrimack Valley-Southern New Hampshire Interstate Air Quality Control Region.
      §81.82 El Paso-Las Cruces-Alamogordo Interstate Air Quality Control Region.
      §81.83 Albuquerque-Mid Rio Grande Intrastate Air Quality Control Region.
      §81.84 Metropolitan Fargo-Moorhead Interstate Air Quality Control Region.
      §81.85 Metropolitan Sioux Falls Interstate Air Quality Control Region.
      §81.86 Metropolitan Sioux City Interstate Air Quality Control Region.
      §81.87 Metropolitan Boise Intrastate Air Quality Control Region.
      §81.88 Billings Intrastate Air Quality Control Region.
      §81.89 Metropolitan Cheyenne Intrastate Air Quality Control Region.
      §81.90 Androscoggin Valley Interstate Air Quality Control Region.
      §81.91 Jacksonville (Florida)-Brunswick (Georgia) Interstate Air Quality Control Region.
      §81.92 Monroe (Louisiana) -- El Dorado (Arkansas) Interstate Air Quality Control Region.
      §81.93 Hampton Roads Intrastate Air Quality Control Region.
      §81.94 Shreveport-Texarkana-Tyler Interstate Air Quality Control Region.
      §81.95 Central Florida Intrastate Air Quality Control Region.
      §81.96 West Central Florida Intrastate Air Quality Control Region.
      §81.97 Southwest Florida Intrastate Air Quality Control Region.
      §81.98 Burlington-Keokuk Interstate Air Quality Control Region.
      §81.99 New Mexico Southern Border Intrastate Air Quality Control Region.
      §81.100 Eastern Washington-Northern Idaho Interstate Air Quality Control Region.
      §81.101 Metropolitan Dubuque Interstate Air Quality Control Region.
      §81.102 Metropolitan Quad Cities Interstate Air Quality Control Region.
      §81.104 Central Pennsylvania Intrastate Air Quality Control Region.
      §81.105 South Central Pennsylvania Intrastate Air Quality Control Region.
      §81.106 Greenville-Spartanburg Intrastate Air Quality Control Region.
      §81.107 Greenwood Intrastate Air Quality Control Region.
      §81.108 Columbia Intrastate Air Quality Control Region.
      §81.109 Florence Intrastate Air Quality Control Region.
      §81.110 Camden-Sumter Intrastate Air Quality Control Region.
      §81.111 Georgetown Intrastate Air Quality Control Region.
      §81.112 Charleston Intrastate Air Quality Control Region.
      §81.113 Savannah (Georgia)-Beaufort (South Carolina) Interstate Air Quality Control Region.
      §81.114 Augusta (Georgia)-Aiken (South Carolina) Interstate Air Quality Control Region.
      §81.115 Northwest Nevada Intrastate Air Quality Control Region.
      §81.116 Northern Missouri Intrastate Air Quality Control Region.
      §81.117 Southeast Missouri Intrastate Air Quality Control Region.
      §81.118 Southwest Missouri Intrastate Air Quality Control Region.
      §81.119 Western Tennessee Intrastate Air Quality Control Region.
      §81.120 Middle Tennessee Intrastate Air Quality Control Region.
      §81.121 Four Corners Interstate Air Quality Control Region.
      §81.122 Mississippi Delta Intrastate Air Quality Control Region.
      §81.123 Southeastern Oklahoma Intrastate Air Quality Control Region.
      §81.124 North Central Oklahoma Intrastate Air Quality Control Region.
      §81.125 Southwestern Oklahoma Intrastate Air Quality Control Region.
      §81.126 Northwestern Oklahoma Intrastate Air Quality Control Region.
      §81.127 Central New York Intrastate Air Quality Control Region.
      §81.128 Genesee-Finger Lakes Intrastate Air Quality Control Region.
      §81.129 Hudson Valley Intrastate Air Quality Control Region.
      §81.130 Southern Tier East Intrastate Air Quality Control Region.
      §81.131 Southern Tier West Intrastate Air Quality Control Region.
      §81.132 Abilene-Wichita Falls Intrastate Air Quality Control Region.
      §81.133 Amarillo-Lubbock Intrastate Air Quality Control Region.
      §81.134 Austin-Waco Intrastate Air Quality Control Region.
      §81.135 Brownsville-Laredo Intrastate Air Quality Control Region.
      §81.136 Corpus Christi-Victoria Intrastate Air Quality Control Region.
      §81.137 Midland-Odessa-San Angelo Intrastate Air Quality Control Region.
      §81.138 Central Arkansas Intrastate Air Quality Control Region.
      §81.139 Northeast Arkansas Intrastate Air Quality Control Region.
      §81.140 Northwest Arkansas Intrastate Air Quality Control Region.
      §81.141 Berkshire Intrastate Air Quality Control Region.
      §81.142 Central Massachusetts Intrastate Air Quality Control Region.
      §81.143 Central Virginia Intrastate Air Quality Control Region.
      §81.144 Northeastern Virginia Intrastate Air Quality Control Region.
      §81.145 State Capital Intrastate Air Quality Control Region.
      §81.146 Valley of Virginia Intrastate Air Quality Control Region.
      §81.147 Eastern Mountain Intrastate Air Quality Control Region.
      §81.148 Eastern Piedmont Intrastate Air Quality Control Region.
      §81.149 Northern Coastal Plain Intrastate Air Quality Control Region.
      §81.150 Northern Piedmont Intrastate Air Quality Control Region.
      §81.151 Sandhills Intrastate Air Quality Control Region.
      §81.152 Southern Coastal Plain Intrastate Air Quality Control Region.
      §81.153 Western Mountain Intrastate Air Quality Control Region.
      §81.154 Eastern Shore Intrastate Air Quality Control Region.
      §81.155 Central Maryland Intrastate Air Quality Control Region.
      §81.156 Southern Maryland Intrastate Air Quality Control Region.
      §81.157 North Central Wisconsin Intrastate Air Quality Control Region.
      §81.158 Southern Wisconsin Intrastate Air Quality Control Region.
      §81.159 Great Basin Valley Intrastate Air Quality Control Region.
      §81.160 North Central Coast Intrastate Air Quality Control Region.
      §81.161 North Coast Intrastate Air Quality Control Region.
      §81.162 Northeast Plateau Intrastate Air Quality Control Region.
      §81.163 Sacramento Valley Intrastate Air Quality Control Region.
      §81.164 San Diego Intrastate Air Quality Control Region.
      §81.165 San Joaquin Valley Intrastate Air Quality Control Region.
      §81.166 South Central Coast Intrastate Air Quality Control Region.
      §81.167 Southeast Desert Intrastate Air Quality Control Region.
      §81.168 Great Falls Intrastate Air Quality Control Region.
      §81.169 Helena Intrastate Air Quality Control Region.
      §81.170 Miles City Intrastate Air Quality Control Region.
      §81.171 Missoula Intrastate Air Quality Control Region.
      §81.172 Comanche Intrastate Air Quality Control Region.
      §81.173 Grand Mesa Intrastate Air Quality Control Region.
      §81.174 Pawnee Intrastate Air Quality Control Region.
      §81.175 San Isabel Intrastate Air Quality Control Region.
      §81.176 San Luis Intrastate Air Quality Control Region.
      §81.177 Yampa Intrastate Air Quality Control Region.
      §81.178 Southern Delaware Intrastate Air Quality Control Region.
      §81.179 Aroostook Intrastate Air Quality Control Region.
      §81.181 Down East Intrastate Air Quality Control Region.
      §81.182 Northwest Maine Intrastate Air Quality Control Region.
      §81.183 Eastern Connecticut Intrastate Air Quality Control Region.
      §81.184 Northwestern Connecticut Intrastate Air Quality Control Region.
      §81.185 Northern Washington Intrastate Air Quality Control Region.
      §81.187 Olympic-Northwest Washington Intrastate Air Quality Control Region.
      §81.189 South Central Washington Intrastate Air Quality Control Region.
      §81.190 Eastern Idaho Intrastate Air Quality Control Region.
      §81.191 Appalachian Intrastate Air Quality Control Region.
      §81.192 Bluegrass Intrastate Air Quality Control Region.
      §81.193 North Central Kentucky Intrastate Air Quality Control Region.
      §81.194 South Central Kentucky Intrastate Air Quality Control Region.
      §81.195 Central Michigan Intrastate Air Quality Control Region.
      §81.196 South Central Michigan Intrastate Air Quality Control Region.
      §81.197 Upper Michigan Intrastate Air Quality Control Region.
      §81.199 East Alabama Intrastate Air Quality Control Region.
      §81.200 Metropolitan Columbus Intrastate Air Quality Control Region.
      §81.201 Mansfield-Marion Intrastate Air Quality Control Region.
      §81.202 Northwest Ohio Intrastate Air Quality Control Region.
      §81.203 Sandusky Intrastate Air Quality Control Region.
      §81.204 Wilmington-Chillicothe-Logan Intrastate Air Quality Control Region.
      §81.205 Zanesville-Cambridge Intrastate Air Quality Control Region.
      §81.213 Casper Intrastate Air Quality Control Region.
      §81.214 Black Hills-Rapid City Intrastate Air Quality Control Region.
      §81.215 East Central Indiana Intrastate Air Quality Control Region.
      §81.216 Northeast Indiana Intrastate Air Quality Control Region.
      §81.217 Southern Indiana Intrastate Air Quality Control Region.
      §81.218 Wabash Valley Intrastate Air Quality Control Region.
      §81.219 Central Oregon Intrastate Air Quality Control Region.
      §81.220 Eastern Oregon Intrastate Air Quality Control Region.
      §81.221 Southwest Oregon Intrastate Air Quality Control Region.
      §81.226 Lincoln-Beatrice-Fairbury Intrastate Air Quality Control Region.
      §81.230 Allegheny Intrastate Air Quality Control Region.
      §81.231 Central West Virginia Intrastate Air Quality Control Region.
      §81.232 Eastern Panhandle Intrastate Air Quality Control Region.
      §81.233 Kanawha Valley Intrastate Air Quality Control Region.
      §81.234 North Central West Virginia Intrastate Air Quality Control Region.
      §81.235 Southern West Virginia Intrastate Air Quality Control Region.
      §81.236 Central Georgia Intrastate Air Quality Control Region.
      §81.237 Northeast Georgia Intrastate Air Quality Control Region.
      §81.238 Southwest Georgia Intrastate Air Quality Control Region.
      §81.239 Upper Rio Grande Valley Intrastate Air Quality Control Region.
      §81.240 Northeastern Plains Intrastate Air Quality Control Region.
      §81.241 Southwestern Mountains-Augustine Plains Intrastate Air Quality Control Region.
      §81.242 Pecos-Permian Basin Intrastate Air Quality Control Region.
      §81.243 Central Minnesota Intrastate Air Quality Control Region.
      §81.244 Northwest Minnesota Intrastate Air Quality Control Region.
      §81.245 Southwest Minnesota Intrastate Air Quality Control Region.
      §81.246 Northern Alaska Intrastate Air Quality Control Region.
      §81.247 South Central Alaska Intrastate Air Quality Control Region.
      §81.248 Southeastern Alaska Intrastate Air Quality Control Region.
      §81.249 Northwest Oregon Intrastate Air Quality Control Region.
      §81.250 North Central Kansas Intrastate Air Quality Control Region.
      §81.251 Northeast Kansas Intrastate Air Quality Control Region.
      §81.252 Northwest Kansas Intrastate Air Quality Control Region.
      §81.253 South Central Kansas Intrastate Air Quality Control Region.
      §81.254 Southeast Kansas Intrastate Air Quality Control Region.
      §81.255 Southwest Kansas Intrastate Air Quality Control Region.
      §81.256 Northeast Iowa Intrastate Air Quality Control Region.
      §81.257 North Central Iowa Intrastate Air Quality Control Region.
      §81.258 Northwest Iowa Intrastate Air Quality Control Region.
      §81.259 Southwest Iowa Intrastate Air Quality Control Region.
      §81.260 South Central Iowa Intrastate Air Quality Control Region.
      §81.261 Southeast Iowa Intrastate Air Quality Control Region.
      §81.262 North Central Illinois Intrastate Air Quality Control Region.
      §81.263 East Central Illinois Intrastate Air Quality Control Region.
      §81.264 West Central Illinois Intrastate Air Quality Control Region.
      §81.265 Southeast Illinois Intrastate Air Quality Control Region.
      §81.266 Alabama and Tombigbee Rivers Intrastate Air Quality Control Region.
      §81.267 Southeast Alabama Intrastate Air Quality Control Region.
      §81.268 Mohave-Yuma Intrastate Air Quality Control Region.
      §81.269 Pima Intrastate Air Quality Control Region.
      §81.270 Northern Arizona Intrastate Air Quality Control Region.
      §81.271 Central Arizona Intrastate Air Quality Control Region.
      §81.272 Southeast Arizona Intrastate Air Quality Control Region.
      §81.273 Lake County Intrastate Air Quality Control Region.
      §81.274 Mountain Counties Intrastate Air Quality Control Region.
      §81.275 Lake Tahoe Intrastate Air Quality Control Region.
   
Subpart C -- Section 107 Attainment Status Designations

      §81.300 Scope.
      §81.301 Alabama.
      §81.302 Alaska.
      §81.303 Arizona.
      §81.304 Arkansas.
      §81.305 California.
      §81.306 Colorado.
      §81.307 Connecticut.
      §81.308 Delaware.
      §81.309 District of Columbia.
      §81.310 Florida.
      §81.311 Georgia.
      §81.312 Hawaii.
      §81.313 Idaho.
      §81.314 Illinois.
      §81.315 Indiana.
      §81.316 Iowa.
      §81.317 Kansas.
      §81.318 Kentucky.
      §81.319 Louisiana.
      §81.320 Maine.
      §81.321 Maryland.
      §81.322 Massachusetts.
      §81.323 Michigan.
      §81.324 Minnesota.
      §81.325 Mississippi.
      §81.326 Missouri.
      §81.327 Montana.
      §81.328 Nebraska.
      §81.329 Nevada.
      §81.330 New Hampshire.
      §81.331 New Jersey.
      §81.332 New Mexico.
      §81.333 New York.
      §81.334 North Carolina.
      §81.335 North Dakota.
      §81.336 Ohio.
      §81.337 Oklahoma.
      §81.338 Oregon.
      §81.339 Pennsylvania.
      §81.340 Rhode Island.
      §81.341 South Carolina.
      §81.342 South Dakota.
      §81.343 Tennessee.
      §81.344 Texas.
      §81.345 Utah.
      §81.346 Vermont.
      §81.347 Virginia.
      §81.348 Washington.
      §81.349 West Virginia.
      §81.350 Wisconsin.
      §81.351 Wyoming.
      §81.352 American Samoa.
      §81.353 Guam.
      §81.354 Northern Mariana Islands.
      §81.355 Puerto Rico.
      §81.356 Virgin Islands.
   
Subpart D -- Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value

      §81.400 Scope.
      §81.401 Alabama.
      §81.402 Alaska.
      §81.403 Arizona.
      §81.404 Arkansas.
      §81.405 California.
      §81.406 Colorado.
      §81.407 Florida.
      §81.408 Georgia.
      §81.409 Hawaii.
      §81.410 Idaho.
      §81.411 Kentucky.
      §81.412 Louisiana.
      §81.413 Maine.
      §81.414 Michigan.
      §81.415 Minnesota.
      §81.416 Missouri.
      §81.417 Montana.
      §81.418 Nevada.
      §81.419 New Hampshire.
      §81.420 New Jersey.
      §81.421 New Mexico.
      §81.422 North Carolina.
      §81.423 North Dakota.
      §81.424 Oklahoma.
      §81.425 Oregon.
      §81.426 South Carolina.
      §81.427 South Dakota.
      §81.428 Tennessee.
      §81.429 Texas.
      §81.430 Utah.
      §81.431 Vermont.
      §81.432 Virgin Islands.
      §81.433 Virginia.
      §81.434 Washington.
      §81.435 West Virginia.
      §81.436 Wyoming.
      §81.437 New Brunswick, Canada.
      Appendix A to Part 81 -- Air Quality Control Regions (AQCR's)