You are here:
AQCRs (Air Quality Control Regions)
December 22, 2025
AQS Reference Table
JavaScript must be enabled to view this page.
To sort on a column, click the column header. That column will be (subtly) highlighted. Particularly useful is the search box at the top of the table on the right. Separate mulitiple search terms with a space. Search looks across all columns in the table.
Downoad a csv version: aqcrs.csv
| AQCR Code | AQCR Name | State Name |
|---|---|---|
| 210 | ABILENE-WICHITA FALLS | Texas |
| 001 | ALABAMA AND TOMBIGBEE RIVERS | Alabama |
| 152 | ALBUQUERQUE-MID RIO GRANDE | New Mexico |
| 231 | ALLEGHENY | West Virginia |
| 211 | AMARILLO-LUBBOCK | Texas |
| 107 | ANDROSCOGGIN VALLEY | Maine |
| 107 | ANDROSCOGGIN VALLEY | New Hampshire |
| 101 | APPALACHIAN | Kentucky |
| 012 | ARIZONA-NEW MEXICO-SOUTHERN BORDER | Arizona |
| 012 | ARIZONA-NEW MEXICO-SOUTHERN BORDER | New Mexico |
| 108 | AROOSTOOK | Maine |
| 053 | AUGUSTA-AIKEN | Georgia |
| 053 | AUGUSTA-AIKEN | South Carolina |
| 212 | AUSTIN-WACO | Texas |
| 117 | BERKSHIRE | Massachusetts |
| 140 | BILLINGS | Montana |
| 205 | BLACKHILLS-RAPID CITY | South Dakota |
| 102 | BLUEGRASS | Kentucky |
| 213 | BROWNSVILLE-LAREDO | Texas |
| 065 | BURLINGTON-KEOKUK | Illinois |
| 065 | BURLINGTON-KEOKUK | Iowa |
| 198 | CAMDEN-SUMTER | South Carolina |
| 241 | CASPER | Wyoming |
| 016 | CENTRAL ARKANSAS | Arkansas |
| 048 | CENTRAL FLORIDA | Florida |
| 054 | CENTRAL GEORGIA | Georgia |
| 112 | CENTRAL MARYLAND | Maryland |
| 118 | CENTRAL MASSACHUSETTS | Massachusetts |
| 122 | CENTRAL MICHIGAN | Michigan |
| 127 | CENTRAL MINNESOTA | Minnesota |
| 158 | CENTRAL NEW YORK | New York |
| 184 | CENTRAL OKLAHOMA | Oklahoma |
| 190 | CENTRAL OREGON | Oregon |
| 195 | CENTRAL PENNSYLVANIA | Pennsylvania |
| 222 | CENTRAL VIRGINIA | Virginia |
| 232 | CENTRAL WEST VIRGINIA | West Virginia |
| 159 | CHAMPLAIN VALLEY | New York |
| 159 | CHAMPLAIN VALLEY | Vermont |
| 199 | CHARLESTON | South Carolina |
| 055 | CHATTANOOGA | Georgia |
| 055 | CHATTANOOGA | Tennessee |
| 013 | CLARK-MOHAVE | Arizona |
| 013 | CLARK-MOHAVE | Nevada |
| 200 | COLUMBIA | South Carolina |
| 002 | COLUMBUS-PHENIX CITY | Alabama |
| 002 | COLUMBUS-PHENIX CITY | Georgia |
| 034 | COMANCHE | Colorado |
| 008 | COOK INLET | Alaska |
| 214 | CORPUS CHRISTI-VICTORIA | Texas |
| 250 | COUNTRY OF MEXICO | Country Of Mexico |
| 113 | CUMBERLAND-KEYSER | Maryland |
| 113 | CUMBERLAND-KEYSER | West Virginia |
| 248 | Country of Canada | Canada |
| 173 | DAYTON | Ohio |
| 109 | DOWN EAST | Maine |
| 129 | DULUTH-SUPERIOR | Minnesota |
| 129 | DULUTH-SUPERIOR | Wisconsin |
| 003 | EAST ALABAMA | Alabama |
| 066 | EAST CENTRAL ILLINOIS | Illinois |
| 076 | EAST CENTRAL INDIANA | Indiana |
| 041 | EASTERN CONNECTICUT | Connecticut |
| 061 | EASTERN IDAHO | Idaho |
| 165 | EASTERN MOUNTAIN | North Carolina |
| 191 | EASTERN OREGON | Oregon |
| 233 | EASTERN PANHANDLE | West Virginia |
| 166 | EASTERN PIEDMONT | North Carolina |
| 114 | EASTERN SHORE | Maryland |
| 207 | EASTERN TENNESSEE-SOUTHWESTERN VIRGINIA | Tennessee |
| 207 | EASTERN TENNESSEE-SOUTHWESTERN VIRGINIA | Virginia |
| 062 | EASTERN WASHINGTON-NORTHERN IDAHO | Idaho |
| 062 | EASTERN WASHINGTON-NORTHERN IDAHO | Washington |
| 153 | EL PASO-LAS CRUCES-ALAMOGORDO | New Mexico |
| 153 | EL PASO-LAS CRUCES-ALAMOGORDO | Texas |
| 077 | EVANSVILLE-OWENSBORO-HENDERSON | Indiana |
| 077 | EVANSVILLE-OWENSBORO-HENDERSON | Kentucky |
| 201 | FLORENCE | South Carolina |
| 014 | FOUR CORNERS | Arizona |
| 014 | FOUR CORNERS | Colorado |
| 014 | FOUR CORNERS | New Mexico |
| 014 | FOUR CORNERS | Utah |
| 160 | GENESEE-FINGER LAKES | New York |
| 204 | GEORGETOWN | South Carolina |
| 035 | GRAND MESA | Colorado |
| 023 | GREAT BASIN VALLEY | California |
| 141 | GREAT FALLS | Montana |
| 174 | GREATER METROPOLITAN CLEVELAND | Ohio |
| 202 | GREENVILLE-SPARTANBURG | South Carolina |
| 203 | GREENWOOD | South Carolina |
| 246 | GUAM | Guam |
| 223 | HAMPTON ROADS | Virginia |
| 042 | HARTFORD-NEW HAVEN-SPRINGFIELD | Connecticut |
| 042 | HARTFORD-NEW HAVEN-SPRINGFIELD | Massachusetts |
| 060 | HAWAII | Hawaii |
| 142 | HELENA | Montana |
| 161 | HUDSON VALLEY | New York |
| 103 | HUNTINGTON-ASHLAND-PORTSMOUTH-IRONTON | Kentucky |
| 103 | HUNTINGTON-ASHLAND-PORTSMOUTH-IRONTON | Ohio |
| 103 | HUNTINGTON-ASHLAND-PORTSMOUTH-IRONTON | West Virginia |
| 063 | IDAHO | Idaho |
| 049 | JACKSONVILLE-BRUNSWICK | Florida |
| 049 | JACKSONVILLE-BRUNSWICK | Georgia |
| 234 | KANAWHA VALLEY | West Virginia |
| 237 | LAKE MICHIGAN | Wisconsin |
| 145 | LINCOLN-BEATRICE-FAIRBURY | Nebraska |
| 078 | LOUISVILLE | Indiana |
| 078 | LOUISVILLE | Kentucky |
| 175 | MANSFIELD-MARION | Ohio |
| 121 | MERRIMACK VALLEY-SOUTHERN NEW HAMPSHIRE | Massachusetts |
| 121 | MERRIMACK VALLEY-SOUTHERN NEW HAMPSHIRE | New Hampshire |
| 056 | METROPOLITAN ATLANTA | Georgia |
| 115 | METROPOLITAN BALTIMORE | Maryland |
| 004 | METROPOLITAN BIRMINGHAM | Alabama |
| 064 | METROPOLITAN BOISE | Idaho |
| 119 | METROPOLITAN BOSTON | Massachusetts |
| 167 | METROPOLITAN CHARLOTTE | North Carolina |
| 167 | METROPOLITAN CHARLOTTE | South Carolina |
| 242 | METROPOLITAN CHEYENNE | Wyoming |
| 067 | METROPOLITAN CHICAGO | Illinois |
| 067 | METROPOLITAN CHICAGO | Indiana |
| 079 | METROPOLITAN CINCINNATI | Indiana |
| 079 | METROPOLITAN CINCINNATI | Kentucky |
| 079 | METROPOLITAN CINCINNATI | Ohio |
| 176 | METROPOLITAN COLUMBUS | Ohio |
| 215 | METROPOLITAN DALLAS-FORT WORTH | Texas |
| 036 | METROPOLITAN DENVER | Colorado |
| 123 | METROPOLITAN DETROIT-PORT HURON | Michigan |
| 068 | METROPOLITAN DUBUQUE | Illinois |
| 068 | METROPOLITAN DUBUQUE | Iowa |
| 068 | METROPOLITAN DUBUQUE | Wisconsin |
| 130 | METROPOLITAN FARGO-MOORHEAD | Minnesota |
| 130 | METROPOLITAN FARGO-MOORHEAD | North Dakota |
| 017 | METROPOLITAN FORT SMITH | Arkansas |
| 017 | METROPOLITAN FORT SMITH | Oklahoma |
| 216 | METROPOLITAN HOUSTON-GALVESTON | Texas |
| 080 | METROPOLITAN INDIANAPOLIS | Indiana |
| 094 | METROPOLITAN KANSAS CITY | Kansas |
| 094 | METROPOLITAN KANSAS CITY | Missouri |
| 024 | METROPOLITAN LOS ANGELES | California |
| 018 | METROPOLITAN MEMPHIS | Arkansas |
| 018 | METROPOLITAN MEMPHIS | Mississippi |
| 018 | METROPOLITAN MEMPHIS | Tennessee |
| 085 | METROPOLITAN OMAHA-COUNCIL BLUFFS | Iowa |
| 085 | METROPOLITAN OMAHA-COUNCIL BLUFFS | Nebraska |
| 045 | METROPOLITAN PHILADELPHIA | Delaware |
| 045 | METROPOLITAN PHILADELPHIA | New Jersey |
| 045 | METROPOLITAN PHILADELPHIA | Pennsylvania |
| 110 | METROPOLITAN PORTLAND | Maine |
| 120 | METROPOLITAN PROVIDENCE | Massachusetts |
| 120 | METROPOLITAN PROVIDENCE | Rhode Island |
| 069 | METROPOLITAN QUAD CITIES | Illinois |
| 069 | METROPOLITAN QUAD CITIES | Iowa |
| 217 | METROPOLITAN SAN ANTONIO | Texas |
| 086 | METROPOLITAN SIOUX CITY | Iowa |
| 086 | METROPOLITAN SIOUX CITY | Nebraska |
| 086 | METROPOLITAN SIOUX CITY | South Dakota |
| 087 | METROPOLITAN SIOUX FALLS | Iowa |
| 087 | METROPOLITAN SIOUX FALLS | South Dakota |
| 070 | METROPOLITAN ST. LOUIS | Illinois |
| 070 | METROPOLITAN ST. LOUIS | Missouri |
| 124 | METROPOLITAN TOLEDO | Michigan |
| 124 | METROPOLITAN TOLEDO | Ohio |
| 208 | MIDDLE TENNESSEE | Tennessee |
| 218 | MIDLAND-ODESSA-SAN ANGELO | Texas |
| 143 | MILES CITY | Montana |
| 131 | MINNEAPOLIS-ST. PAUL | Minnesota |
| 134 | MISSISSIPPI DELTA | Mississippi |
| 144 | MISSOULA | Montana |
| 005 | MOBILE-PENSACOLA-PANAMA CITY-SOUTHERN MISSISSIPPI | Alabama |
| 005 | MOBILE-PENSACOLA-PANAMA CITY-SOUTHERN MISSISSIPPI | Florida |
| 005 | MOBILE-PENSACOLA-PANAMA CITY-SOUTHERN MISSISSIPPI | Mississippi |
| 019 | MONROE-EL DORADO | Arkansas |
| 019 | MONROE-EL DORADO | Louisiana |
| 047 | NATIONAL CAPITAL | District Of Columbia |
| 047 | NATIONAL CAPITAL | Maryland |
| 047 | NATIONAL CAPITAL | Virginia |
| 146 | NEBRASKA | Nebraska |
| 147 | NEVADA | Nevada |
| 149 | NEW HAMPSHIRE | New Hampshire |
| 150 | NEW JERSEY | New Jersey |
| 043 | NEW JERSEY-NEW YORK-CONNECTICUT | Connecticut |
| 043 | NEW JERSEY-NEW YORK-CONNECTICUT | New Jersey |
| 043 | NEW JERSEY-NEW YORK-CONNECTICUT | New York |
| 162 | NIAGARA FRONTIER | New York |
| 025 | NORTH CENTRAL COAST | California |
| 071 | NORTH CENTRAL ILLINOIS | Illinois |
| 089 | NORTH CENTRAL IOWA | Iowa |
| 096 | NORTH CENTRAL KANSAS | Kansas |
| 104 | NORTH CENTRAL KENTUCKY | Kentucky |
| 185 | NORTH CENTRAL OKLAHOMA | Oklahoma |
| 235 | NORTH CENTRAL WEST VIRGINIA | West Virginia |
| 238 | NORTH CENTRAL WISCONSIN | Wisconsin |
| 026 | NORTH COAST | California |
| 172 | NORTH DAKOTA | North Dakota |
| 020 | NORTHEAST ARKANSAS | Arkansas |
| 057 | NORTHEAST GEORGIA | Georgia |
| 081 | NORTHEAST INDIANA | Indiana |
| 088 | NORTHEAST IOWA | Iowa |
| 095 | NORTHEAST KANSAS | Kansas |
| 135 | NORTHEAST MISSISSIPPI | Mississippi |
| 151 | NORTHEAST PENNSYLVANIA-UPPER DELAWARE VALLEY | New Jersey |
| 151 | NORTHEAST PENNSYLVANIA-UPPER DELAWARE VALLEY | Pennsylvania |
| 027 | NORTHEAST PLATEAU | California |
| 186 | NORTHEASTERN OKLAHOMA | Oklahoma |
| 154 | NORTHEASTERN PLAINS | New Mexico |
| 224 | NORTHEASTERN VIRGINIA | Virginia |
| 009 | NORTHERN ALASKA | Alaska |
| 168 | NORTHERN COASTAL PLAIN | North Carolina |
| 137 | NORTHERN MISSOURI | Missouri |
| 136 | NORTHERN PIEDMONT | North Carolina |
| 227 | NORTHERN WASHINGTON | Washington |
| 021 | NORTHWEST ARKANSAS | Arkansas |
| 090 | NORTHWEST IOWA | Iowa |
| 097 | NORTHWEST KANSAS | Kansas |
| 111 | NORTHWEST MAINE | Maine |
| 132 | NORTHWEST MINNESOTA | Minnesota |
| 148 | NORTHWEST NEVADA | Nevada |
| 177 | NORTHWEST OHIO | Ohio |
| 192 | NORTHWEST OREGON | Oregon |
| 178 | NORTHWEST PENNSYLVANIA-YOUNGSTOWN | Ohio |
| 178 | NORTHWEST PENNSYLVANIA-YOUNGSTOWN | Pennsylvania |
| 044 | NORTHWESTERN CONNECTICUT | Connecticut |
| 187 | NORTHWESTERN OKLAHOMA | Oklahoma |
| 228 | OLYMPIA-NORTHWEST WASHINGTON | Washington |
| 072 | PADUCAH-CAIRO | Illinois |
| 072 | PADUCAH-CAIRO | Kentucky |
| 179 | PARKERSBURG-MARIETTA | Ohio |
| 179 | PARKERSBURG-MARIETTA | West Virginia |
| 037 | PAWNEE | Colorado |
| 155 | PECOS-PERMIAN BASIN | New Mexico |
| 015 | PHOENIX-TUCSON | Arizona |
| 193 | PORTLAND | Oregon |
| 193 | PORTLAND | Washington |
| 244 | PUERTO RICO | Puerto Rico |
| 229 | PUGET SOUND | Washington |
| 073 | ROCKFORD-JANESVILLE-BELOIT | Illinois |
| 073 | ROCKFORD-JANESVILLE-BELOIT | Wisconsin |
| 028 | SACRAMENTO VALLEY | California |
| 029 | SAN DIEGO | California |
| 030 | SAN FRANCISCO BAY AREA | California |
| 038 | SAN ISABEL | Colorado |
| 031 | SAN JOAQUIN VALLEY | California |
| 039 | SAN LUIS | Colorado |
| 169 | SANDHILLS | North Carolina |
| 180 | SANDUSKY | Ohio |
| 058 | SAVANNAH-BEAUFORT | Georgia |
| 058 | SAVANNAH-BEAUFORT | South Carolina |
| 022 | SHREVEPORT-TEXARKANA-TYLER | Arkansas |
| 022 | SHREVEPORT-TEXARKANA-TYLER | Louisiana |
| 022 | SHREVEPORT-TEXARKANA-TYLER | Oklahoma |
| 022 | SHREVEPORT-TEXARKANA-TYLER | Texas |
| 082 | SOUTH BEND-ELKHART-BENTON HARBOR | Indiana |
| 082 | SOUTH BEND-ELKHART-BENTON HARBOR | Michigan |
| 010 | SOUTH CENTRAL ALASKA | Alaska |
| 032 | SOUTH CENTRAL COAST | California |
| 092 | SOUTH CENTRAL IOWA | Iowa |
| 099 | SOUTH CENTRAL KANSAS | Kansas |
| 105 | SOUTH CENTRAL KENTUCKY | Kentucky |
| 125 | SOUTH CENTRAL MICHIGAN | Michigan |
| 196 | SOUTH CENTRAL PENNSYLVANIA | Pennsylvania |
| 230 | SOUTH CENTRAL WASHINGTON | Washington |
| 206 | SOUTH DAKOTA | South Dakota |
| 006 | SOUTHEAST ALABAMA | Alabama |
| 033 | SOUTHEAST DESERT | California |
| 050 | SOUTHEAST FLORIDA | Florida |
| 074 | SOUTHEAST ILLINOIS | Illinois |
| 091 | SOUTHEAST IOWA | Iowa |
| 098 | SOUTHEAST KANSAS | Kansas |
| 128 | SOUTHEAST MINNESOTA-LA CROSSE | Minnesota |
| 128 | SOUTHEAST MINNESOTA-LA CROSSE | Wisconsin |
| 138 | SOUTHEAST MISSOURI | Missouri |
| 011 | SOUTHEASTERN ALASKA | Alaska |
| 188 | SOUTHEASTERN OKLAHOMA | Oklahoma |
| 239 | SOUTHEASTERN WISCONSIN | Wisconsin |
| 170 | SOUTHERN COASTAL PLAIN | North Carolina |
| 046 | SOUTHERN DELAWARE | Delaware |
| 083 | SOUTHERN INDIANA | Indiana |
| 106 | SOUTHERN LOUISIANA-SOUTHEAST TEXAS | Louisiana |
| 106 | SOUTHERN LOUISIANA-SOUTHEAST TEXAS | Texas |
| 116 | SOUTHERN MARYLAND | Maryland |
| 163 | SOUTHERN TIER EAST | New York |
| 164 | SOUTHERN TIER WEST | New York |
| 236 | SOUTHERN WEST VIRGINIA | West Virginia |
| 240 | SOUTHERN WISCONSIN | Wisconsin |
| 051 | SOUTHWEST FLORIDA | Florida |
| 059 | SOUTHWEST GEORGIA | Georgia |
| 093 | SOUTHWEST IOWA | Iowa |
| 100 | SOUTHWEST KANSAS | Kansas |
| 133 | SOUTHWEST MINNESOTA | Minnesota |
| 139 | SOUTHWEST MISSOURI | Missouri |
| 194 | SOUTHWEST OREGON | Oregon |
| 197 | SOUTHWEST PENNSYLVANIA | Pennsylvania |
| 156 | SOUTHWESTERN MOUNTAINS-AUGUSTINE PLAINS | New Mexico |
| 189 | SOUTHWESTERN OKLAHOMA | Oklahoma |
| 225 | STATE CAPITAL | Virginia |
| 181 | STEUBENVILLE-WEIRTON-WHEELING | Ohio |
| 181 | STEUBENVILLE-WEIRTON-WHEELING | West Virginia |
| 007 | TENNESSEE RIVER VALLEY-CUMBERLAND MOUNTAINS | Alabama |
| 007 | TENNESSEE RIVER VALLEY-CUMBERLAND MOUNTAINS | Tennessee |
| 247 | U.S. VIRGIN ISLANDS | Virgin Islands |
| 126 | UPPER MICHIGAN | Michigan |
| 157 | UPPER RIO GRANDE VALLEY | New Mexico |
| 219 | UTAH | Utah |
| 226 | VALLEY OF VIRGINIA | Virginia |
| 221 | VERMONT | Vermont |
| 084 | WABASH VALLEY | Indiana |
| 220 | WASATCH FRONT | Utah |
| 052 | WEST CENTRAL FLORIDA | Florida |
| 075 | WEST CENTRAL ILLINOIS | Illinois |
| 171 | WESTERN MOUNTAIN | North Carolina |
| 209 | WESTERN TENNESSEE | Tennessee |
| 182 | WILMINGTON-CHILLICOTHE-LOGAN | Ohio |
| 243 | WYOMING | Wyoming |
| 040 | YAMPA | Colorado |
| 183 | ZANESVILLE-CAMBRIDGE | Ohio |