Subpart B—Designation of Air Quality Control Regions

1. CFR
2. ›
3. Title 40
4. ›
5. Chapter I
6. ›
7. Part 81
8. ›
9. Subpart B

Sections

Section numbering in the official eCFR can be non-consecutive. Omitted section numbers are not treated here as reserved unless the source explicitly labels them that way.

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