| <Agency Code> | <Agency Desc> | <Agency Type> | <Agency Type Desc> |
|---|---|---|---|
| 0001 | 3M Chemolite | J | PRIVATE |
| 1211 | A K Steel | J | PRIVATE |
| 0002 | A. E. Staly Company | J | PRIVATE |
| 0003 | AAT Labs, Inc | J | PRIVATE |
| 1244 | ABT Associates, Inc. | J | PRIVATE |
| 0004 | ADEM - Mobile (Field Office) | G | COUNTY AGENCY |
| 0345 | AECOM | J | PRIVATE |
| 1317 | APPTIS, Inc. | J | PRIVATE |
| 1361 | ARA, Atmospheric Research and Analysis | J | PRIVATE |
| 0005 | Aeromet Engineering, Inc | J | PRIVATE |
| 0006 | Affiliated Environmental Services, Inc | J | PRIVATE |
| 0007 | Air Pollution Control Division Of Water And Air Resources | F | STATE AGENCY |
| 0008 | Air Quality Consultants, Inc | J | PRIVATE |
| 0069 | Air Quality Services | J | PRIVATE |
| 0009 | Air Resource Specialists, Inc | J | PRIVATE |
| 0010 | Air Sciences Incorporated | J | PRIVATE |
| 1300 | Air ToxicsLimited, CA | J | PRIVATE |
| 0011 | Akron Department Of Health | H | CITY AGENCY |
| 0012 | Akron Regional Air Pollution Control Agency | H | CITY AGENCY |
| 0013 | Al Dept Of Env Mgt | F | STATE AGENCY |
| 1223 | Alachua County Environmental Protection Department | G | COUNTY AGENCY |
| 0014 | Alachua County Pollution Control District | G | COUNTY AGENCY |
| 0015 | Alaska Department Of Environmental Conservation | F | STATE AGENCY |
| 0016 | Albright College | K | INSTITUTION |
| 0017 | Albuquerque Environmental Health Department, Air Quality Division | H | CITY AGENCY |
| 0018 | Alexandria Health Department | H | CITY AGENCY |
| 0019 | Aleyska Pipeline Service Company | J | PRIVATE |
| 0020 | Allegany County Health Department | G | COUNTY AGENCY |
| 0021 | Allegheny County,PA Health Department | G | COUNTY AGENCY |
| 0022 | Allied Corporation-Moncure Plant | J | PRIVATE |
| 0023 | Altoona Department Of Water Parks And Public Property | H | CITY AGENCY |
| 0024 | Aluminum Company Of America | J | PRIVATE |
| 0025 | Amador County APCD | I | DISTRICT AGENCY |
| 0026 | Amarillo Bi-City-County Health Department | G | COUNTY AGENCY |
| 0027 | Amax Coal Company | J | PRIVATE |
| 1224 | Ambient Air Services, Inc. | J | PRIVATE |
| 0028 | Amerada Hess | J | PRIVATE |
| 0029 | American Colloid | J | PRIVATE |
| 0030 | American Crystal Sugar Company | J | PRIVATE |
| 0031 | American Electric Power | J | PRIVATE |
| 0032 | American Enka Company | J | PRIVATE |
| 0070 | American Municipal Power-Ohio, Inc | J | PRIVATE |
| 0033 | American Natural Gas | J | PRIVATE |
| 0034 | Amoco | J | PRIVATE |
| 0035 | Amoco Oil Company | J | PRIVATE |
| 0036 | Anaconda Aluminum Company | J | PRIVATE |
| 0037 | Anaconda Copper Company | J | PRIVATE |
| 0038 | Anaconda Minerals Company | J | PRIVATE |
| 1347 | Anadarko, WY | J | PRIVATE |
| 0039 | Anderson Air Pollution Control Department | H | CITY AGENCY |
| 0040 | Anne Arundel County Department Of Health | G | COUNTY AGENCY |
| 0041 | Antelope Coal Company | J | PRIVATE |
| 0042 | Antelope Valley APCD | I | DISTRICT AGENCY |
| 0043 | Appalachian Mountain Club | J | PRIVATE |
| 0044 | Appalachian State University | K | INSTITUTION |
| 0045 | Appleton Health Department | H | CITY AGENCY |
| 0046 | Appleton Papers Incorporated | J | PRIVATE |
| 0047 | Applied Environmental Consultants, Inc | J | PRIVATE |
| 0048 | Applied Meteorology, Inc | J | PRIVATE |
| 1350 | Arch Coal Company, WY | J | PRIVATE |
| 0049 | Archbold Biological Station | I | DISTRICT AGENCY |
| 0050 | Arco | J | PRIVATE |
| 0051 | Arco Coal Company | J | PRIVATE |
| 0052 | Area Oil Shale Supervisor Office | J | PRIVATE |
| 0053 | Arizona Department Of Environmental Quality | F | STATE AGENCY |
| 0054 | Arizona Portland Cement Company | J | PRIVATE |
| 0055 | Arkansas Department Of Environmental Quality | F | STATE AGENCY |
| 0056 | Arlington Co Environmental Health Bureau Dept Human Resource | G | COUNTY AGENCY |
| 0057 | Armco | J | PRIVATE |
| 0058 | Armco Steel Company | J | PRIVATE |
| 0060 | Artic Health Research Laboratory | N | FED NONMILITARY |
| 0061 | Asarco | J | PRIVATE |
| 0062 | Asarco, Inc | J | PRIVATE |
| 0063 | Ash Grove Cement | J | PRIVATE |
| 0064 | Ashland Oil | J | PRIVATE |
| 0065 | Ashland-Boyd County Health Department | G | COUNTY AGENCY |
| 1333 | Aspen Consulting & Testing | J | PRIVATE |
| 0066 | Associated Electric | J | PRIVATE |
| 0067 | Atlantic Gelatine | J | PRIVATE |
| 1221 | Atmospheric Analysis & Consulting Inc. Ventura, CA | J | PRIVATE |
| 0071 | Atmospheric Research Institute | J | PRIVATE |
| 0068 | Austin-Travis County Health Department | G | COUNTY AGENCY |
| 0096 | BGI- Billings Generation Incorporated | J | PRIVATE |
| 0072 | Baldwin County Health Department | G | COUNTY AGENCY |
| 0073 | Baltimore City Health Department | H | CITY AGENCY |
| 0074 | Baltimore County Division Of Air Pollution Control | G | COUNTY AGENCY |
| 0075 | Baltimore County Health Department | G | COUNTY AGENCY |
| 0076 | Baltimore Gas And Electric Company | J | PRIVATE |
| 0077 | Barkley And Dexter Labs, Inc | J | PRIVATE |
| 0078 | Barmet Aluminum Corporation | J | PRIVATE |
| 0079 | Barr Engineering Company | J | PRIVATE |
| 0080 | Basic, Inc | J | PRIVATE |
| 0081 | Basin Creek Mining | J | PRIVATE |
| 0082 | Batelle | J | PRIVATE |
| 0083 | Bath Iron Works, Bath, Me | J | PRIVATE |
| 0084 | Battelle Memorial Institute | J | PRIVATE |
| 0085 | Battelle Northwest Laboratories | J | PRIVATE |
| 0086 | Bay Area Air Quality Management District | I | DISTRICT AGENCY |
| 0087 | Bay County Health Department | G | COUNTY AGENCY |
| 0088 | Bearpaw Energy Inc | J | PRIVATE |
| 0089 | Beaunit Fibers | J | PRIVATE |
| 0090 | Bedford Park Air Pollution Control Board | H | CITY AGENCY |
| 0091 | Beker Industries | J | PRIVATE |
| 0092 | Benham Holway Power Group | J | PRIVATE |
| 1327 | Benton Clean Air Authority, WA | I | DISTRICT AGENCY |
| 0093 | Berlin Foundry Corporation | J | PRIVATE |
| 0094 | Bethlehem Bureau Of Health | H | CITY AGENCY |
| 0095 | Bethlehem Steel Corporation | J | PRIVATE |
| 0097 | Bi-City Health Bureau | H | CITY AGENCY |
| 0098 | Big Rivers Electric Corporation | J | PRIVATE |
| 0099 | Billings Laurel Air Quality Technical Committee | I | DISTRICT AGENCY |
| 0100 | Binghamton Bureau Of Health | H | CITY AGENCY |
| 0101 | Bismarck Department Of Health And Building Inspection | H | CITY AGENCY |
| 0102 | Bison Engineering | J | PRIVATE |
| 0103 | Black And Vetch Consulting Engineers | J | PRIVATE |
| 1367 | Black Butte Coal Company | J | PRIVATE |
| 1364 | Black hills Power | J | PRIVATE |
| 0105 | Boc Flint | J | PRIVATE |
| 0106 | Boise Cascade Company | J | PRIVATE |
| 0107 | Boliden Intertrade Inc | J | PRIVATE |
| 0108 | Boliden Resources Inc, T12r8 | J | PRIVATE |
| 0109 | Borden Chemical Company | J | PRIVATE |
| 0110 | Boston Edison Company | J | PRIVATE |
| 0111 | Boulder City-County Health Department | G | COUNTY AGENCY |
| 0112 | Bowater Southern Paper Company | J | PRIVATE |
| 0113 | Brand S Lumber Company | J | PRIVATE |
| 0114 | Braun Intertec | J | PRIVATE |
| 0115 | Brc/Rasmussen | J | PRIVATE |
| 0116 | Brevard County Health Department | G | COUNTY AGENCY |
| 0117 | Brevard County Office Of Natural Resources | G | COUNTY AGENCY |
| 0118 | Brewster Phosphates | J | PRIVATE |
| 0119 | Briess Industries, Inc | J | PRIVATE |
| 0120 | Bristol Health Department | H | CITY AGENCY |
| 0121 | Broward County Environmental Protection Department | G | COUNTY AGENCY |
| 0122 | Broward County Health Department | G | COUNTY AGENCY |
| 0123 | Brown Printing Central | J | PRIVATE |
| 0124 | Browning Ferris Industries | J | PRIVATE |
| 0125 | Brownwood-Brown County Health Department | G | COUNTY AGENCY |
| 0126 | Bruce Carter & Associates | J | PRIVATE |
| 0127 | Brunswick Naval Air Station, Brunswick | L | MILITARY |
| 0128 | Brush-Wellman | J | PRIVATE |
| 0129 | Bryce Canyon National Park | N | FED NONMILITARY |
| 0130 | Buick Motor Division | J | PRIVATE |
| 0131 | Buncombe County Health Department | G | COUNTY AGENCY |
| 0132 | Bunker Hill | J | PRIVATE |
| 0133 | Burgess & Niple, Limited | J | PRIVATE |
| 0134 | Burlington Northern Railroad Company | J | PRIVATE |
| 0135 | Burns And Mcdonnell Engineering Company | J | PRIVATE |
| 0136 | Business Health Management Environmental Laboratory | J | PRIVATE |
| 0137 | Butte County APCD | I | DISTRICT AGENCY |
| 0138 | Butte-Silver Bow County Health Department | G | COUNTY AGENCY |
| 0139 | C.T. Main, Inc, Boston, MA | J | PRIVATE |
| 1386 | CGI Federal | J | PRIVATE |
| 0164 | CH2M Hill | J | PRIVATE |
| 1304 | CIRA, Colorado State University | K | INSTITUTION |
| 0140 | Cabell Huntington Health Department | G | COUNTY AGENCY |
| 0141 | Caddo Parish-Shreveport Health Unit | G | COUNTY AGENCY |
| 0142 | Calaveras County Health Department | G | COUNTY AGENCY |
| 0143 | Calcasieu Parish Health Unit | G | COUNTY AGENCY |
| 0144 | Calhoun County Health Department | G | COUNTY AGENCY |
| 0145 | California Air Resources Board | F | STATE AGENCY |
| 0146 | California Institute Of Technology | K | INSTITUTION |
| 0147 | Cambria Co Envir Resources Dept Bureau Air Quality & Noise | G | COUNTY AGENCY |
| 0148 | Camden Bureau Of Fire Department Of Public Safety | H | CITY AGENCY |
| 0149 | Camden County Health Department | G | COUNTY AGENCY |
| 0150 | Campbell Soup | J | PRIVATE |
| 0151 | Canton City Health Department Air Pollution Control | H | CITY AGENCY |
| 1307 | Capitol Area Council of Governments, TX | I | DISTRICT AGENCY |
| 0152 | Carborundum | J | PRIVATE |
| 0153 | Carter Mining Company | J | PRIVATE |
| 0154 | Cascade City-County Health Department | G | COUNTY AGENCY |
| 0155 | Cascade County Air Pollution Control | G | COUNTY AGENCY |
| 0156 | Casper-Natrona County Health Department | G | COUNTY AGENCY |
| 1233 | Cenex Harvest States - Superior, WI | J | PRIVATE |
| 0157 | Centennial Minerals | J | PRIVATE |
| 1267 | Center For Disease Control | N | FED NONMILITARY |
| 1326 | Center for Lab Science RJ Lee Grp Inc/Columbia Basin Col. | K | INSTITUTION |
| 0158 | Centerior Energy | J | PRIVATE |
| 0159 | Central Analytical Lab | J | PRIVATE |
| 0160 | Central Foundry | J | PRIVATE |
| 0161 | Central Illinois Light Company | J | PRIVATE |
| 0162 | Central Maine Power Company, Maine Office, Augusta | J | PRIVATE |
| 0163 | Central Wayne Co. Sanitation Authority | J | PRIVATE |
| 0165 | Champion International Corporation | J | PRIVATE |
| 0166 | Champion-Hoerner Waldorf | J | PRIVATE |
| 0167 | Charleston County Health Department | G | COUNTY AGENCY |
| 0168 | Charleston Federal Building | H | CITY AGENCY |
| 0169 | Charlotte Health Department | H | CITY AGENCY |
| 0170 | Chattanooga-Hamilton County Air Pollution Control | G | COUNTY AGENCY |
| 0171 | Chem-Met | J | PRIVATE |
| 0172 | Chemetco | J | PRIVATE |
| 0173 | Chen Northern Labs | J | PRIVATE |
| 0174 | Cherokee County Health Department | G | COUNTY AGENCY |
| 0175 | Cherry Hill Board Of Health | H | CITY AGENCY |
| 0176 | Chester Bureau Of Health | H | CITY AGENCY |
| 1334 | Chester LabNet. | J | PRIVATE |
| 0177 | Chev Saginaw Metals Casting Plant | J | PRIVATE |
| 0178 | Chevrolet Motor Division | J | PRIVATE |
| 0179 | Chevron | J | PRIVATE |
| 0180 | Chicago Department Of Air Pollution Control | H | CITY AGENCY |
| 0181 | Chicago Department Of Consumer Services | H | CITY AGENCY |
| 0182 | Chippewa County Health Department | G | COUNTY AGENCY |
| 1396 | Chippewa Sand Company, LLC | J | PRIVATE |
| 0183 | Cianbro/Dragon Cement, Thomaston | J | PRIVATE |
| 0184 | Cincinnati Bureau Air Pollution Control & Heating Inspection | H | CITY AGENCY |
| 1339 | Citation Corp., WI | J | PRIVATE |
| 0223 | City University of New York, CUNY | K | INSTITUTION |
| 1358 | City of Aspen, CO | H | CITY AGENCY |
| 0185 | City of Austin, TX | H | CITY AGENCY |
| 0186 | City of Bangor | H | CITY AGENCY |
| 0187 | City of Bloomington | H | CITY AGENCY |
| 0188 | City of Bridgeport Department of Health | H | CITY AGENCY |
| 0189 | City of Bristol Department of Health | H | CITY AGENCY |
| 0190 | City of Chattanooga | H | CITY AGENCY |
| 0191 | City of Cincinnati Division of Air Pollution Control | H | CITY AGENCY |
| 0192 | City of Cleveland Division of Air Pollution Control | H | CITY AGENCY |
| 0193 | City of Colorado Springs | H | CITY AGENCY |
| 0194 | City of Columbus Air Pollution Control | H | CITY AGENCY |
| 0195 | City of Columbus Division of Electricity | H | CITY AGENCY |
| 0196 | City of Dallas Air Pollution Control Section | H | CITY AGENCY |
| 0335 | City of El Paso-Air Quality Program | G | COUNTY AGENCY |
| 1360 | City of Frisco | L | MILITARY |
| 0197 | City of Ft Collins, Colorado Environmental Health | H | CITY AGENCY |
| 0198 | City of Granite City | H | CITY AGENCY |
| 0199 | City of Greenwich Department of Health | H | CITY AGENCY |
| 0200 | City of Houston Health Department | H | CITY AGENCY |
| 0300 | City of Huntsville, Div of Natural Resources | H | CITY AGENCY |
| 0544 | City of Jacksonville Environmental Quality Division | H | CITY AGENCY |
| 0201 | City of Meriden Department of Health | H | CITY AGENCY |
| 0202 | City of Middletown Department of Health | H | CITY AGENCY |
| 0203 | City of Milbank | H | CITY AGENCY |
| 0204 | City of Milford Department of Health | H | CITY AGENCY |
| 0205 | City of Milwaukee | H | CITY AGENCY |
| 0206 | City of Moorhead Healht Department | H | CITY AGENCY |
| 0207 | City of Muncie | H | CITY AGENCY |
| 0208 | City of New Britain Department of Health | H | CITY AGENCY |
| 0209 | City of New Haven Department of Health | H | CITY AGENCY |
| 0210 | City of New York Department of Environmental Protection | H | CITY AGENCY |
| 0211 | City of North Chicago | H | CITY AGENCY |
| 0212 | City of Norwalk Department of Health | H | CITY AGENCY |
| 0213 | City of Richfield | H | CITY AGENCY |
| 0214 | City of Richmond, Bureau of Air Pollution Control | H | CITY AGENCY |
| 0215 | City of Roanoke, Department of Air Pollution | H | CITY AGENCY |
| 0216 | City of Schenectady Health Department | H | CITY AGENCY |
| 0217 | City of Stamford Department of Health | H | CITY AGENCY |
| 0218 | City of Stratford Department of Health | H | CITY AGENCY |
| 0219 | City of Tampa Department of Sanitary Sewers | H | CITY AGENCY |
| 0220 | City of Toledo, Environmental Services Division | H | CITY AGENCY |
| 0221 | City of Utica Department of Health | H | CITY AGENCY |
| 0222 | City of York Department of Health | H | CITY AGENCY |
| 0224 | City-County Of Denver Health Department | G | COUNTY AGENCY |
| 0227 | Clark County, AZ Health District | G | COUNTY AGENCY |
| 0225 | Clark County, IN Health Department | G | COUNTY AGENCY |
| 0226 | Clark County, NV DAQEM | G | COUNTY AGENCY |
| 0228 | Clemson Agriculture College & US Dept Of Agriculture | K | INSTITUTION |
| 0229 | Cleveland Air Pollution Control Agency | H | CITY AGENCY |
| 0230 | Cleveland County Air Pollution Control Agency | G | COUNTY AGENCY |
| 0231 | Cleveland Department Of Health And Welfare | H | CITY AGENCY |
| 0232 | Cleveland Public Schools | K | INSTITUTION |
| 0233 | Cleveland-Cliffs Iron Company | J | PRIVATE |
| 0234 | Clifton Board Of Health | H | CITY AGENCY |
| 0235 | Coca Mines, Inc | J | PRIVATE |
| 0236 | Cochise County Health Department | G | COUNTY AGENCY |
| 0237 | Cogeneration Management Company | J | PRIVATE |
| 0238 | Coldwater Board Of Public Utilities | J | PRIVATE |
| 0239 | College of Staten Island | K | INSTITUTION |
| 1225 | Collier County Pollution Control Department | G | COUNTY AGENCY |
| 1380 | Colorado Bureau of Land Management | S | GEMS |
| 0241 | Colorado Department of Highways | F | STATE AGENCY |
| 0240 | Colorado Department of Public Health And Environment | F | STATE AGENCY |
| 1389 | Colorado State University | J | PRIVATE |
| 0242 | Colt Industries-Beloit | J | PRIVATE |
| 1382 | Columbia Analytical Services | P | EPA REGION |
| 0243 | Columbia County Health Department | G | COUNTY AGENCY |
| 0244 | Columbia Falls Aluminum | J | PRIVATE |
| 0245 | Columbia-Williamette Air Pollution Authority | I | DISTRICT AGENCY |
| 0246 | Columbus Division of Smoke Regulation And Inspection | H | CITY AGENCY |
| 0247 | Colusa County APCD | I | DISTRICT AGENCY |
| 1315 | Computer Science Corporation | J | PRIVATE |
| 0248 | Con Agra | J | PRIVATE |
| 0249 | Concordia Parish Health Unit | G | COUNTY AGENCY |
| 0251 | Connecticut Department of Environmental Protection | F | STATE AGENCY |
| 0252 | Connecticut Department of Health | F | STATE AGENCY |
| 1395 | Consci LTD | J | PRIVATE |
| 0253 | Conservation Consultants, Inc | J | PRIVATE |
| 0254 | Consolidated Aluminum Company | J | PRIVATE |
| 0255 | Consolidated Papers | J | PRIVATE |
| 0256 | Consumers Power Company | J | PRIVATE |
| 0257 | Continental Lime | J | PRIVATE |
| 0258 | Cook County Department of Environmental Control | G | COUNTY AGENCY |
| 0259 | Cook Inlet Air Resources Management District | I | DISTRICT AGENCY |
| 0260 | Cool Water Coal Gasification Programs | J | PRIVATE |
| 0261 | Cordero Mining Company | J | PRIVATE |
| 0262 | Core Laboratories, Inc | J | PRIVATE |
| 0263 | Corpus Christi-Nueces County Department of Public Health | G | COUNTY AGENCY |
| 1310 | County of Suffolk (NY) Division of Environmental Quality | G | COUNTY AGENCY |
| 0264 | Covington-Kenton County Health Department | G | COUNTY AGENCY |
| 0265 | Crandon Mining Company | J | PRIVATE |
| 0266 | Crane and Company, Inc | J | PRIVATE |
| 1359 | Crocker Nuclear Laboratory, University of California | C | EPA HQ EFFECTS |
| 0268 | Cumberland Forestry Division | H | CITY AGENCY |
| 0269 | Cyanokem, Inc | J | PRIVATE |
| 0270 | Cyprus Industrial Minerals Company | J | PRIVATE |
| 0271 | Cyprus Northshore Mining | J | PRIVATE |
| 1263 | D. A. B. Industries, Inc., OH | J | PRIVATE |
| 0273 | D.I. Corporation/James River, Old Town | J | PRIVATE |
| 1353 | DATA CHEM Laboratories, Inc., OH | J | PRIVATE |
| 0277 | Dairyland Greyhound Park | J | PRIVATE |
| 0278 | Dairyland Power Cooperative | J | PRIVATE |
| 0279 | Dakota Gasification Company | J | PRIVATE |
| 0280 | Dames & Moore, Inc | J | PRIVATE |
| 0281 | Dane County Department of Public Works | G | COUNTY AGENCY |
| 0282 | Danville Health Department | H | CITY AGENCY |
| 0283 | David E. Woodman | J | PRIVATE |
| 0284 | Davies County Health Department | G | COUNTY AGENCY |
| 0285 | Dayton Bureau of Combustion Control | H | CITY AGENCY |
| 0286 | Dayton Power and Light | J | PRIVATE |
| 0287 | Dayton Regional Air Pollution Control Agency | H | CITY AGENCY |
| 0288 | Dearborn Department of Public Works | H | CITY AGENCY |
| 0289 | Decker Coal Company | J | PRIVATE |
| 0290 | Deerfield Speciality Papers | J | PRIVATE |
| 0291 | Del Rio-Val Verde Health Department | G | COUNTY AGENCY |
| 0292 | Delaware Air Pollution Authority State Board of Health | F | STATE AGENCY |
| 0293 | Delaware County Health Department | G | COUNTY AGENCY |
| 0294 | Delaware Dept Natural Resources and Environmental Control | F | STATE AGENCY |
| 0295 | Delco Remy | J | PRIVATE |
| 0296 | Delta Chemicals, Searsport | J | PRIVATE |
| 0297 | Denver Research Institute | J | PRIVATE |
| 0298 | Department of Health County Of Westchester | G | COUNTY AGENCY |
| 0301 | Derenzo and Associates | J | PRIVATE |
| 1207 | Desert Research Institute | J | PRIVATE |
| 0302 | Detroit Bureau of Air Pollution Control | H | CITY AGENCY |
| 0303 | Detroit Edison Company | J | PRIVATE |
| 0304 | Detroit Metro Airport | J | PRIVATE |
| 1391 | Devon Energy | J | PRIVATE |
| 0305 | Diamond Shamrock Corporation | J | PRIVATE |
| 1340 | Didion Milling, Inc., WI | J | PRIVATE |
| 1305 | Dios Dado Environmental Ltd., Selma, TX | J | PRIVATE |
| 1303 | Direccion General De Ecoligia Gobierno del Estado de Baja California | Z | OTHER |
| 0350 | District Dept of Environment, Air Quality Div - DDOE/AQD | I | DISTRICT AGENCY |
| 0306 | District of Columbia Department of Public Health | I | DISTRICT AGENCY |
| 0307 | Division of Environmental Engineering Rennselaer Polytechnic | K | INSTITUTION |
| 0308 | Doe Run | J | PRIVATE |
| 1288 | Doe Run Buick | J | PRIVATE |
| 1289 | Doe Run Glover | J | PRIVATE |
| 1290 | Doe Run Herculaneum | J | PRIVATE |
| 0309 | Dona Ana County Health Department | G | COUNTY AGENCY |
| 0310 | Doniphan County Health Department | G | COUNTY AGENCY |
| 0311 | Doug Yanggen & Associates | J | PRIVATE |
| 0312 | Dow Chemical Company | J | PRIVATE |
| 0313 | Dow Corning | J | PRIVATE |
| 0314 | Dragon Products, Thomaston | J | PRIVATE |
| 0315 | Dry Fork Coal Company | J | PRIVATE |
| 0316 | Du Pont | J | PRIVATE |
| 0317 | Du Pont Imaging System | J | PRIVATE |
| 0318 | Dubois County Health Department | G | COUNTY AGENCY |
| 1324 | Duke Energy | J | PRIVATE |
| 0319 | Duluth Department of Public Health | H | CITY AGENCY |
| 0320 | Duluth Missabe And Iron Range Railway Company | J | PRIVATE |
| 1204 | Durham County Air Pollution Control Agency | G | COUNTY AGENCY |
| 1205 | Duval Health Improvement Authority | G | COUNTY AGENCY |
| 1206 | Dynecol, Inc | J | PRIVATE |
| 0321 | E. Robert Alley & Associates | J | PRIVATE |
| 0322 | E.C. Jordon/C-E Envir/Abb | J | PRIVATE |
| 1242 | E.H. Pechan | J | PRIVATE |
| 1251 | ECR Incorporated | J | PRIVATE |
| 1362 | EE-MS, Environmental Engineering Measurement | J | PRIVATE |
| 0340 | EMPE | J | PRIVATE |
| 1377 | EOG Resources | J | PRIVATE |
| 1368 | EPA HQ - OECA | N | FED NONMILITARY |
| 0362 | EPA New Mexico IPA | F | STATE AGENCY |
| 0363 | ER & T Commonwealth Edison | J | PRIVATE |
| 0364 | ERCE | J | PRIVATE |
| 1318 | EXCEL Management Systems, Inc. | J | PRIVATE |
| 0323 | East Baton Rouge Parish Health Unit | G | COUNTY AGENCY |
| 0324 | East Chicago Division of Air Quality | H | CITY AGENCY |
| 0325 | East Grand Fire Department (Polk County) | H | CITY AGENCY |
| 0326 | East Kentucky Power Company | J | PRIVATE |
| 0327 | East Penn Manufacturing Company | J | PRIVATE |
| 0328 | East Side Health District | H | CITY AGENCY |
| 0329 | Eastern Research Group | J | PRIVATE |
| 0330 | Eastman Gelatine | J | PRIVATE |
| 0331 | Easton City Hall | H | CITY AGENCY |
| 0332 | Eau Claire City-County Health Department | H | CITY AGENCY |
| 0333 | Ecology Audits, Inc | J | PRIVATE |
| 0334 | El Dorado County APCD | I | DISTRICT AGENCY |
| 0336 | El Paso County Health Department | G | COUNTY AGENCY |
| 0337 | Elizabeth Department of Health | H | CITY AGENCY |
| 0338 | Elmira Maintenance Department | H | CITY AGENCY |
| 0339 | Embreeville State Hospital Sewage Treatment Plant | J | PRIVATE |
| 1372 | Encana, WY | J | PRIVATE |
| 1387 | Enefit | Z | OTHER |
| 0341 | Energy Lab Inc, Billings, Mt | J | PRIVATE |
| 0342 | Enesco/Cal Lab Analytical | J | PRIVATE |
| 0343 | Engineering Science, Inc | J | PRIVATE |
| 0344 | Enserch Environmental | J | PRIVATE |
| 0346 | Entropy Environmentalists, Inc | J | PRIVATE |
| 0347 | Enviro Plan | J | PRIVATE |
| 0348 | Enviro-Chem | J | PRIVATE |
| 1243 | Environ | J | PRIVATE |
| 1238 | Environment Canada | J | PRIVATE |
| 1329 | Environmental Analytical Services Inc., CA | J | PRIVATE |
| 0349 | Environmental Consulting Services, Inc | J | PRIVATE |
| 1208 | Environmental Engineering | J | PRIVATE |
| 0351 | Environmental Health Laboratories-Philadelphia | J | PRIVATE |
| 0352 | Environmental Health Services | J | PRIVATE |
| 0361 | Environmental Monitoring Company (Emc) | J | PRIVATE |
| 0353 | Environmental Research & Technology, Inc (ERT) | J | PRIVATE |
| 0354 | Environmental Research Foundation | J | PRIVATE |
| 0355 | Environmental Science & Engineering, Inc (Ese) | J | PRIVATE |
| 0356 | Environmental Science And Engineering | J | PRIVATE |
| 1356 | Environmental Standards, Inc., PA | J | PRIVATE |
| 0357 | Environmental System Corporation | J | PRIVATE |
| 0358 | Environmental Testing | J | PRIVATE |
| 0359 | Environmental Waste Control | J | PRIVATE |
| 0360 | Enviroplan | J | PRIVATE |
| 0365 | Eri/University Of Connecticut | K | INSTITUTION |
| 0366 | Erie Bureau Of Engineers Licenses And Smoke Abatement | H | CITY AGENCY |
| 0367 | Erie County Department Of Environmental Control | G | COUNTY AGENCY |
| 0368 | Erie County Dept Of Health Division Of Environmental Control | G | COUNTY AGENCY |
| 0369 | Erie County Health Department | G | COUNTY AGENCY |
| 0370 | Espey, Huston, And Associates, Inc | J | PRIVATE |
| 0371 | Etowah County Health Department | G | COUNTY AGENCY |
| 0372 | Evansville Division Of Air Pollution Control | H | CITY AGENCY |
| 0373 | Everglades National Park | N | FED NONMILITARY |
| 0374 | Ewing Paper Mills | J | PRIVATE |
| 0375 | Exide Corporation | J | PRIVATE |
| 0376 | Exxon | J | PRIVATE |
| 0377 | Exxon Minerals Company | J | PRIVATE |
| 1226 | FDEP Ambient Monitoring Section | F | STATE AGENCY |
| 0401 | FMC Corporation | J | PRIVATE |
| 0378 | Fairbanks North Star Borough Environmental Services | G | COUNTY AGENCY |
| 0379 | Fairfax County Health Department, Environmental Health Div. | G | COUNTY AGENCY |
| 0380 | Fargo Health Department | H | CITY AGENCY |
| 0381 | Farrell City Hall | H | CITY AGENCY |
| 0382 | Feather River Air Quality Management District | I | DISTRICT AGENCY |
| 0383 | Federal Government | N | FED NONMILITARY |
| 1330 | Fishbak, Thompson & Carr & Huber, MI | J | PRIVATE |
| 0384 | Fitchburg Paper Company | J | PRIVATE |
| 0385 | Flambeau Mining Corporation | J | PRIVATE |
| 0386 | Flathead County Health Department | G | COUNTY AGENCY |
| 0387 | Flint Air Pollution Control Division | H | CITY AGENCY |
| 0388 | Flint Department Of Public Works And Utilities | H | CITY AGENCY |
| 0418 | Florida Dep Of Environmental Protection Lab, Tallahassee | F | STATE AGENCY |
| 0389 | Florida Department Of Air And Water Pollution Control | F | STATE AGENCY |
| 1328 | Florida Department of Environmental Protection (FDEP) | F | STATE AGENCY |
| 0390 | Florida Dept of Environmental Protection Northeast District Branch Office | F | STATE AGENCY |
| 0396 | Florida Dept of Environmental Protection, Central District | F | STATE AGENCY |
| 0391 | Florida Dept of Environmental Protection, Northeast District | F | STATE AGENCY |
| 0392 | Florida Dept of Environmental Protection, Northwest District | F | STATE AGENCY |
| 0393 | Florida Dept of Environmental Protection, South District | F | STATE AGENCY |
| 0394 | Florida Dept of Environmental Protection, Southeast District | F | STATE AGENCY |
| 0395 | Florida Dept of Environmental Protection, Southwest District | F | STATE AGENCY |
| 0397 | Florida Power And Light | J | PRIVATE |
| 0398 | Florida Power Corporation | J | PRIVATE |
| 0399 | Florida State Board Of Health | F | STATE AGENCY |
| 1319 | Florida Sugar Cane League | J | PRIVATE |
| 0400 | Fluid Management, Inc | J | PRIVATE |
| 0402 | Ford Motors | J | PRIVATE |
| 0403 | Forsyth County Environmental Affairs Department | G | COUNTY AGENCY |
| 0404 | Forsyth County Health Department | G | COUNTY AGENCY |
| 0407 | Fort Wayne Board Of Health | H | CITY AGENCY |
| 0408 | Fort Worth Health Department | H | CITY AGENCY |
| 0409 | Foth And Van Dyke | J | PRIVATE |
| 0410 | France Stone Company | J | PRIVATE |
| 0411 | Franklin County Marine Laboratory | G | COUNTY AGENCY |
| 0412 | Fraser Paper Company, Madawaska | J | PRIVATE |
| 0413 | Frederick County Health Department | G | COUNTY AGENCY |
| 1357 | Freeport McMoRan Miami, Inc. | J | PRIVATE |
| 0414 | Fresno County APCD | I | DISTRICT AGENCY |
| 0416 | Ft Union Coal Company | J | PRIVATE |
| 0417 | Fulton County Health Department | G | COUNTY AGENCY |
| 0425 | GCA, Technology Division | J | PRIVATE |
| 0449 | GM Central Foundry | J | PRIVATE |
| 0466 | GRI | J | PRIVATE |
| 0419 | Gainesville Air Pollution Research Laboratory | H | CITY AGENCY |
| 1227 | Gainesville Regional Utilities | J | PRIVATE |
| 0420 | Galveston City-County Health Department | G | COUNTY AGENCY |
| 0421 | Gary Division Of Air Pollution Control | H | CITY AGENCY |
| 0422 | Gary Fire Department | H | CITY AGENCY |
| 0423 | Gaston County Air Pollution Agency | G | COUNTY AGENCY |
| 0424 | Gaston County Health Department | G | COUNTY AGENCY |
| 0426 | General Chemical Corporation | J | PRIVATE |
| 0427 | General Electric | J | PRIVATE |
| 0428 | General Foods, Post Division | J | PRIVATE |
| 0429 | General Mills | J | PRIVATE |
| 0430 | General Motors | J | PRIVATE |
| 0431 | General Portland Cement Company | J | PRIVATE |
| 0432 | General Smelting And Refining | J | PRIVATE |
| 0433 | Geneva Lakes Environmental Agency | Z | OTHER |
| 0434 | Geneva Steel | J | PRIVATE |
| 0435 | Geomet Technologies, Inc | J | PRIVATE |
| 0436 | Georesearch, Inc | J | PRIVATE |
| 0437 | Georgia Air Protection Branch Ambient Monitoring Program | F | STATE AGENCY |
| 0438 | Georgia Department Of Public Health | F | STATE AGENCY |
| 0439 | Georgia Dept Of Natural Resources Air Quality Evaluation | F | STATE AGENCY |
| 0440 | Georgia Pacific Company, Woodland | J | PRIVATE |
| 0441 | Geraghty & Miller, Inc | J | PRIVATE |
| 0442 | Gillen Company | J | PRIVATE |
| 0443 | Glacier Daido America | J | PRIVATE |
| 0444 | Glacier National Park | N | FED NONMILITARY |
| 1264 | Glacier Vandervell, Inc., OH | J | PRIVATE |
| 0445 | Glassboro State College, Science Department | K | INSTITUTION |
| 0446 | Glen Cove Department Of Public Works | H | CITY AGENCY |
| 0447 | Glendale Department Of Public Service | H | CITY AGENCY |
| 0448 | Glenn County APCD | I | DISTRICT AGENCY |
| 0450 | Gmad - Lake Orion | J | PRIVATE |
| 0451 | Gold Field Mining Corporation | J | PRIVATE |
| 0452 | Golden Sunlight Mines, Inc | J | PRIVATE |
| 1351 | Golder Associates, Inc. | J | PRIVATE |
| 1229 | Goodyear Tire Obion County, TN | J | PRIVATE |
| 0453 | Gopher Smelting And Refining | J | PRIVATE |
| 1214 | Grain Processors | J | PRIVATE |
| 0454 | Grand Forks Health Department | H | CITY AGENCY |
| 0455 | Grand Haven Board Of Water And Light | J | PRIVATE |
| 0456 | Grand Rapids Department Of Air Pollution | H | CITY AGENCY |
| 1336 | Graymont Western US, Inc. | J | PRIVATE |
| 0457 | Grayson County Health Department | G | COUNTY AGENCY |
| 0458 | Great Basin Unified APCD | I | DISTRICT AGENCY |
| 0459 | Great Falls City-County Health Department | G | COUNTY AGENCY |
| 0460 | Great Northern Paper Company, Millinocket | J | PRIVATE |
| 1308 | Great Smoky Mtn NP | N | FED NONMILITARY |
| 0461 | Greater Anchorage Area Borough Health Department | I | DISTRICT AGENCY |
| 0462 | Greater Detroit Resource Recovery Authority | J | PRIVATE |
| 0463 | Greede Industries | J | PRIVATE |
| 0464 | Greenlee County | G | COUNTY AGENCY |
| 0465 | Greenville County Health Department | G | COUNTY AGENCY |
| 0467 | Guam Environmental Protection Agency | F | STATE AGENCY |
| 0468 | Guam Power Authority | J | PRIVATE |
| 0469 | Guilford County Health Department | G | COUNTY AGENCY |
| 0470 | Gulf Coast Research Lab Institutions Of Higher Learning | J | PRIVATE |
| 1259 | Hamilton County Department Of Environmental Services | G | COUNTY AGENCY |
| 0471 | Hamilton County Southwest Ohio Air Pollution Control | G | COUNTY AGENCY |
| 0472 | Hammond Division Of Air Pollution Control | H | CITY AGENCY |
| 0473 | Hammond Health Department | H | CITY AGENCY |
| 1216 | Hammond Pb | J | PRIVATE |
| 0474 | Hampton Health Department | H | CITY AGENCY |
| 0475 | Hancock County Health Department | G | COUNTY AGENCY |
| 0476 | Hanna Mining Company | J | PRIVATE |
| 1265 | Hanson Aggregates Midwest, Inc., OH | J | PRIVATE |
| 0477 | Hardy Salt | J | PRIVATE |
| 0478 | Harvard School Of Public Health, Department Of Physiology | K | INSTITUTION |
| 0479 | Hatteras Naval Facility, United States Navy | L | MILITARY |
| 0480 | Haverhill Paperboard | J | PRIVATE |
| 0481 | Hawaii State Department Of Health | F | STATE AGENCY |
| 0482 | Hawaiian Electric Company | J | PRIVATE |
| 0483 | Hazleton Dept Environmental Resources, Bureau Air Pollution | H | CITY AGENCY |
| 0484 | Hechimovich Sanitary Landfill, Inc | J | PRIVATE |
| 0485 | Henderson County Health Department | G | COUNTY AGENCY |
| 0486 | Henry-Martinsville Health District | I | DISTRICT AGENCY |
| 0487 | Hercules | J | PRIVATE |
| 0488 | Hernando County Planning Department | G | COUNTY AGENCY |
| 0489 | Hess Oil, Virgin Islands Corporation | J | PRIVATE |
| 0490 | Hibbing Taconite | J | PRIVATE |
| 0491 | Hillsborough County Environmental Protection Commission | G | COUNTY AGENCY |
| 0492 | Hillsborough County Health Department | G | COUNTY AGENCY |
| 0493 | Hoerner-Waldorf Corporation | J | PRIVATE |
| 0494 | Holland Board Of Public Works | J | PRIVATE |
| 0495 | Hollingsworth And Vase Company | J | PRIVATE |
| 0508 | Holtrachem Manufacturing Company | J | PRIVATE |
| 0496 | Holyoke Gas And Electric | J | PRIVATE |
| 0497 | Homestake Copper Company | J | PRIVATE |
| 0498 | Homestake Mining Company | J | PRIVATE |
| 0499 | Honda Of America, Inc | J | PRIVATE |
| 0500 | Hooker Chemical Company | J | PRIVATE |
| 0501 | Hoosier Energy | J | PRIVATE |
| 0921 | Horsehead Corp | J | PRIVATE |
| 0502 | Horsehead Resource Development Company | J | PRIVATE |
| 0503 | Houston Lighting And Power | J | PRIVATE |
| 1239 | Hovensa L. L. C. | J | PRIVATE |
| 0504 | Howard County Health Department | G | COUNTY AGENCY |
| 0505 | Hudson Municipal Air Pollution Commission | G | COUNTY AGENCY |
| 0506 | Humboldt County APCD | I | DISTRICT AGENCY |
| 1332 | Hydrometrics | J | PRIVATE |
| 0509 | I/N Tek | J | PRIVATE |
| 1316 | ICF International | J | PRIVATE |
| 0510 | Idaho Air Quality Bureau | F | STATE AGENCY |
| 0511 | Idaho Department Of Health And Welfare-Environment Division | F | STATE AGENCY |
| 0512 | Illinois Department Of Public Health | F | STATE AGENCY |
| 0513 | Illinois Environmental Protection Agency | F | STATE AGENCY |
| 0514 | Illinois State Water Survey | F | STATE AGENCY |
| 0516 | Immigration And Custom Building | N | FED NONMILITARY |
| 0517 | Imore Gas Gaw And Electric Company | J | PRIVATE |
| 0518 | Imperial County APCD | I | DISTRICT AGENCY |
| 1296 | Independent Contractor | J | PRIVATE |
| 0519 | Indiana & Michigan Electric Company | J | PRIVATE |
| 0520 | Indiana Depart Of Environ Management/Office Of Air Quality | F | STATE AGENCY |
| 0521 | Indiana State Department Of Conservation | F | STATE AGENCY |
| 0522 | Indiana University Of Pennsylvania | K | INSTITUTION |
| 0523 | Indianapolis Office of Environmental Services | H | CITY AGENCY |
| 0524 | Indianapolis Power And Light Company | J | PRIVATE |
| 0525 | Indianapolis State Police | H | CITY AGENCY |
| 0526 | Inland Mining Company | J | PRIVATE |
| 0527 | Inter-Mountain Laboratory Sheridan, WY | J | PRIVATE |
| 0528 | International Paper Company | J | PRIVATE |
| 1257 | International Truck & Engine Corp., WI | J | PRIVATE |
| 0529 | Interpoll Laboratories, Inc | J | PRIVATE |
| 0530 | Iowa Department Of Natural Resources | F | STATE AGENCY |
| 0531 | Iowa Power And Light Company | J | PRIVATE |
| 0532 | Iowa State Department Of Health | F | STATE AGENCY |
| 0533 | Ironton Air Pollution Control Agency | H | CITY AGENCY |
| 0534 | Ironton City Health Department | H | CITY AGENCY |
| 0536 | J.E. Baker Company | J | PRIVATE |
| 0537 | J.M. Huber Corporation, Easton | J | PRIVATE |
| 0538 | J.R. Simplot Company | J | PRIVATE |
| 0558 | JPI Transportation Products, Inc | J | PRIVATE |
| 0539 | Jackson City Planning Office, Colorado Department Of Health | H | CITY AGENCY |
| 0540 | Jackson County Iron Company | J | PRIVATE |
| 0542 | Jackson Department Of Public Health | H | CITY AGENCY |
| 0541 | Jackson, KY Department Of Health | H | CITY AGENCY |
| 1209 | Jackson, MS Department Of Health | H | CITY AGENCY |
| 0543 | Jacksonville Air Pollution Control Activity | H | CITY AGENCY |
| 0545 | Jacksonville Department Health And Rehabilitation Services | H | CITY AGENCY |
| 0546 | James River Paper Corporation | J | PRIVATE |
| 0547 | James W Gelhaus Townsend, MT | J | PRIVATE |
| 0548 | Janesville Department Of Public Works | H | CITY AGENCY |
| 0550 | Jefferson County, AL Department Of Health | G | COUNTY AGENCY |
| 0551 | Jefferson County, CO Health Department | G | COUNTY AGENCY |
| 0549 | Jefferson County, KY Air Pollution Control District | G | COUNTY AGENCY |
| 0552 | Jefferson County, TX Health Department | G | COUNTY AGENCY |
| 0553 | Jersey City Board Of Health | H | CITY AGENCY |
| 0554 | John Brown Incorporated | J | PRIVATE |
| 1213 | John'S Manville | J | PRIVATE |
| 0555 | Johns Hopkins University | K | INSTITUTION |
| 0556 | Johnson County Health Department | G | COUNTY AGENCY |
| 0557 | Johnstown Fire Department | H | CITY AGENCY |
| 0559 | Kalamazoo City-County Health Department | H | CITY AGENCY |
| 0560 | Kansas City Air Quality Division, Missouri | H | CITY AGENCY |
| 0561 | Kansas City Health Department, Air Quality Section | H | CITY AGENCY |
| 0562 | Kansas City, KS And Wyandotte County Health Department | G | COUNTY AGENCY |
| 0563 | Kansas Department Of Health And Environment | F | STATE AGENCY |
| 0564 | Kantus | J | PRIVATE |
| 0565 | Keci Television | J | PRIVATE |
| 0566 | Kemron Environmental Services | J | PRIVATE |
| 0567 | Kendall Company | J | PRIVATE |
| 0568 | Kennecott Minerals Company | J | PRIVATE |
| 0569 | Kenosha Health Department | H | CITY AGENCY |
| 0570 | Kent County Landfill | G | COUNTY AGENCY |
| 0584 | Kentucky Division For Air Quality | F | STATE AGENCY |
| 0571 | Kentucky Electric Steel Company | J | PRIVATE |
| 0572 | Kentucky Power Company | J | PRIVATE |
| 0573 | Kentucky Utilities | J | PRIVATE |
| 0574 | Kenvirons, Inc | J | PRIVATE |
| 0575 | Kern County APCD | I | DISTRICT AGENCY |
| 0576 | Kerr - McGee | J | PRIVATE |
| 0577 | Kiewit Mining Company | J | PRIVATE |
| 0578 | Kimberly Clark Corporation | J | PRIVATE |
| 0579 | Kings County APCD | I | DISTRICT AGENCY |
| 0580 | Knife River Coal | J | PRIVATE |
| 0581 | Knox County Department Of Air Pollution Control | G | COUNTY AGENCY |
| 0582 | Koch Hydrocarbon | J | PRIVATE |
| 0583 | Koch Refining Company | J | PRIVATE |
| 1352 | Kohler, WI | J | PRIVATE |
| 0586 | L. F. C. Power Systems | J | PRIVATE |
| 0587 | La Crosse Health Department | H | CITY AGENCY |
| 1342 | LaCrosse County, WI | G | COUNTY AGENCY |
| 0590 | Lackawanna Valley Survey | G | COUNTY AGENCY |
| 0591 | Lafarge Corporation | J | PRIVATE |
| 0628 | Lafarge Lime Ohio Inc | J | PRIVATE |
| 0592 | Lake Charles Technical Air Committee | J | PRIVATE |
| 0593 | Lake County APCD | I | DISTRICT AGENCY |
| 0594 | Lake County Consolidated Air Quality Monitoring Work Group | G | COUNTY AGENCY |
| 0595 | Lake County Health Department Division Air Pollution Control | G | COUNTY AGENCY |
| 0596 | Lancaster Labs, Inc | J | PRIVATE |
| 0597 | Land Reclamation Company | J | PRIVATE |
| 0598 | Lane Regional Air Pollution Authority | I | DISTRICT AGENCY |
| 0599 | Lansing Air Pollution Control Board | H | CITY AGENCY |
| 0600 | Lansing Board Of Water And Light | J | PRIVATE |
| 0601 | Lansing Car Assembly | J | PRIVATE |
| 0602 | Laredo-Webb County Health Department | G | COUNTY AGENCY |
| 0603 | Larimer County Health Department | G | COUNTY AGENCY |
| 0604 | Las Animas-Huerfand District Health Department | I | DISTRICT AGENCY |
| 0605 | Lassen County APCD | I | DISTRICT AGENCY |
| 0606 | Lehigh Portland Cement | J | PRIVATE |
| 0607 | Lehigh Valley Air Pollution Control District | I | DISTRICT AGENCY |
| 0608 | Lewis And Clark County Health Department | G | COUNTY AGENCY |
| 0609 | Lincoln County Health Department | G | COUNTY AGENCY |
| 0610 | Lincoln Pulp And Paper Company, Lincoln | J | PRIVATE |
| 0611 | Lincoln-Lancaster County Health Department | G | COUNTY AGENCY |
| 0612 | Lincoln-Mesa County Health Department | G | COUNTY AGENCY |
| 0613 | Linn County Health Department | G | COUNTY AGENCY |
| 0614 | Livonia Bureau Of Inspections | H | CITY AGENCY |
| 1314 | Lockheed Martin Information Technology | J | PRIVATE |
| 0615 | Loeb Industries | J | PRIVATE |
| 1258 | Logistics Management Institute | J | PRIVATE |
| 0616 | Lomac, Inc (Bofors Lakeway) | J | PRIVATE |
| 1215 | Lone Star Industries | J | PRIVATE |
| 0617 | Long Beach Department Of Public Health | H | CITY AGENCY |
| 0618 | Long Island Lighting Company | J | PRIVATE |
| 0619 | Lorain Air Air Pollution Control Agency | J | PRIVATE |
| 0620 | Lorain Department Of Public Service | H | CITY AGENCY |
| 0621 | Los Angeles County APCD | I | DISTRICT AGENCY |
| 0622 | Loudoun County Health Department | G | COUNTY AGENCY |
| 0623 | Louisiana Pacific | J | PRIVATE |
| 0624 | Lowa Public Service Company | J | PRIVATE |
| 1311 | Loyola University Chicago | K | INSTITUTION |
| 0625 | Lubbock City-County Health Department | G | COUNTY AGENCY |
| 0626 | Luzenzac America, Inc | J | PRIVATE |
| 0627 | Lynchburg Water Department | H | CITY AGENCY |
| 1298 | MARAMA | J | PRIVATE |
| 0629 | Macomb County Health Department | G | COUNTY AGENCY |
| 1345 | Mactec, Inc | J | PRIVATE |
| 0630 | Madera County APCD | I | DISTRICT AGENCY |
| 0631 | Madison County Department Of Public Health | G | COUNTY AGENCY |
| 0632 | Madison Department Of Public Health | H | CITY AGENCY |
| 0633 | Madison Paper Industries | J | PRIVATE |
| 0634 | Mahoning-Trumbull Air Pollution Control Agency | H | CITY AGENCY |
| 0635 | Maine D.E.P. Bureau Of Air Quality Control, Augusta | F | STATE AGENCY |
| 0637 | Maine Technical Services | J | PRIVATE |
| 0638 | Manatee County Environmental Management Department | G | COUNTY AGENCY |
| 0639 | Manistique Pulp & Paper | J | PRIVATE |
| 0640 | Manitowoc Public Utilities | J | PRIVATE |
| 0641 | Mansfield-Richland Health Department | H | CITY AGENCY |
| 0642 | Marathon Oil | J | PRIVATE |
| 1302 | Maricopa Association of Governments | G | COUNTY AGENCY |
| 0643 | Maricopa County Air Quality | G | COUNTY AGENCY |
| 0644 | Marietta Board Of Health | H | CITY AGENCY |
| 0645 | Mariposa County APCD | I | DISTRICT AGENCY |
| 0646 | Marquette Board Of Light And Power | J | PRIVATE |
| 0647 | Marshall University, Department Of Chemistry | K | INSTITUTION |
| 0648 | Marshall-Harrison County Health District | G | COUNTY AGENCY |
| 0649 | Martin County Health Department | G | COUNTY AGENCY |
| 0650 | Martin Marietta | J | PRIVATE |
| 0651 | Martin Marietta And Ohio Lime Companies | J | PRIVATE |
| 0652 | Martin Marietta Cement/Dragon Cement/Thomaston | J | PRIVATE |
| 1210 | Martins Ferry Health Department | H | CITY AGENCY |
| 0653 | Marvin Windows & Doors | J | PRIVATE |
| 0654 | Maryland Air Quality Programs | F | STATE AGENCY |
| 0655 | Maryland Department Of The Environment | F | STATE AGENCY |
| 0656 | Maryland State Bureau Of Air Quality And Noise Control | F | STATE AGENCY |
| 0657 | Maryland State Department Of Health | F | STATE AGENCY |
| 0658 | Maryland State Division Of Air Monitoring | F | STATE AGENCY |
| 0659 | Maryland State Division Of Air Quality Control | F | STATE AGENCY |
| 0660 | Mass Dept Environmental Protection-Div Air Quality Control | F | STATE AGENCY |
| 0661 | Massachusetts Muncipal Wholesale Electric Company | J | PRIVATE |
| 0662 | Massachusetts Port Authority | J | PRIVATE |
| 0663 | Master Metals | J | PRIVATE |
| 0664 | Matagorda County Health Department | G | COUNTY AGENCY |
| 0665 | Mauna Loa Observatory | J | PRIVATE |
| 0666 | McCracken County Health Department | G | COUNTY AGENCY |
| 0667 | McVehil-Monnett Associates | J | PRIVATE |
| 0668 | Mead Paper Company | J | PRIVATE |
| 0669 | Mecklenburg County Air Quality | G | COUNTY AGENCY |
| 0670 | Medical Area Total Energy Plant (MATEP) | J | PRIVATE |
| 0671 | Medina County Joint Vocational School | J | PRIVATE |
| 0672 | Melvin Simon & Associates, Inc - Mall Of America | J | PRIVATE |
| 0673 | Memphis-Shelby County Health Department | G | COUNTY AGENCY |
| 0674 | Menasha | J | PRIVATE |
| 0675 | Mendocino County APCD | I | DISTRICT AGENCY |
| 0677 | Merced County APCD | I | DISTRICT AGENCY |
| 0678 | Mercer County Health Department | G | COUNTY AGENCY |
| 0679 | Mesa County Health Department | G | COUNTY AGENCY |
| 1341 | Metal Tek Inc., WI | J | PRIVATE |
| 1331 | Meteorological Solutions, Inc. | J | PRIVATE |
| 0680 | Metronics Associates | J | PRIVATE |
| 0681 | Metropolitan Airports Commission | H | CITY AGENCY |
| 0682 | Metropolitan Health Department/Nashville & Davidson County | L | MILITARY |
| 0274 | Miami-Dade County Department of Environmental Resources Management | G | COUNTY AGENCY |
| 0683 | Michigan City Air Pollution Control Division | H | CITY AGENCY |
| 0684 | Michigan Department Of Public Health | F | STATE AGENCY |
| 0685 | Michigan Dept Of Environmental Quality-Air Quality Division | F | STATE AGENCY |
| 0686 | Michigan Disposal, Inc | J | PRIVATE |
| 0687 | Michigan Recovery Systems | J | PRIVATE |
| 0688 | Michigan Standard Alloys | J | PRIVATE |
| 0689 | Michigan State Department Of Conservation | F | STATE AGENCY |
| 0690 | Michigan Tech University | K | INSTITUTION |
| 0691 | Mid Williamette Valley Air Pollution Authority | G | COUNTY AGENCY |
| 1293 | Mid-American Energy, IA | J | PRIVATE |
| 0692 | Midland Cogeneration Venture | J | PRIVATE |
| 0693 | Midwest Energy Resources Company | J | PRIVATE |
| 0694 | Mineral County Health Department | G | COUNTY AGENCY |
| 0695 | Mineral Hill Mine | J | PRIVATE |
| 0696 | Mingo Junction Air Pollution Department | H | CITY AGENCY |
| 0697 | Minneapolis Air Pollution Control Division | H | CITY AGENCY |
| 0698 | Minnesota Department Of Health | F | STATE AGENCY |
| 0699 | Minnesota Department Of Transportation | F | STATE AGENCY |
| 0700 | Minnesota Pollution Control Agency, Division Of Air Quality | F | STATE AGENCY |
| 0701 | Minnesota Power And Light Company | J | PRIVATE |
| 0702 | Mississippi Air And Water Pollution Control Commission | F | STATE AGENCY |
| 0703 | Mississippi DEQ, Office Of Pollution | F | STATE AGENCY |
| 0704 | Missoula City-County Health Department | G | COUNTY AGENCY |
| 1252 | Missouri Dept Of Natural Resources | F | STATE AGENCY |
| 0588 | Missouri Laboratory Services Program | F | STATE AGENCY |
| 0705 | Mitre Corporation | J | PRIVATE |
| 0706 | Mobil Chemical Company | J | PRIVATE |
| 0707 | Mobile Coal Producing | J | PRIVATE |
| 0708 | Modoc County APCD | I | DISTRICT AGENCY |
| 0709 | Mojave Desert AQMD | I | DISTRICT AGENCY |
| 0710 | Moline Health Department | H | CITY AGENCY |
| 0711 | Monitor Sugar | J | PRIVATE |
| 0712 | Monroe County Health Department | G | COUNTY AGENCY |
| 1247 | Monroe County, WI | G | COUNTY AGENCY |
| 0713 | Monsanto Industrial Chemicals Company | J | PRIVATE |
| 0714 | Montana Department Of State Lands | F | STATE AGENCY |
| 0715 | Montana Power Company | J | PRIVATE |
| 0716 | Montana Refining Company | J | PRIVATE |
| 0717 | Montana Resources | J | PRIVATE |
| 0718 | Montana Talc Company | J | PRIVATE |
| 0719 | Montana Tunnels Mining, Inc | J | PRIVATE |
| 0720 | Montaup Electric Company | J | PRIVATE |
| 0721 | Monterey Bay Unified APCD | I | DISTRICT AGENCY |
| 0722 | Montgomery County Department Of Public Health | G | COUNTY AGENCY |
| 0723 | Montgomery County, AL Health Department | G | COUNTY AGENCY |
| 0725 | Montgomery County, MD Health Department | G | COUNTY AGENCY |
| 0724 | Montgomery County, OH Health Department | G | COUNTY AGENCY |
| 0736 | Montgomery Watson | J | PRIVATE |
| 0726 | Morehouse Parish Health Unit | G | COUNTY AGENCY |
| 0727 | Morton Grove Air Pollution Control Board | H | CITY AGENCY |
| 0728 | Morton Salt | J | PRIVATE |
| 1363 | Mountain Cement | J | PRIVATE |
| 1376 | Mountain Studies Institute | Z | OTHER |
| 0729 | Mountain, Inc | J | PRIVATE |
| 0730 | Mt Dept Of Environmental Quality, Air Quality Division | F | STATE AGENCY |
| 0731 | Mummy Mountain Observatory | J | PRIVATE |
| 0732 | Municipality Of Anchorage Air Pollution Control Agency | G | COUNTY AGENCY |
| 0733 | Murray & Trettle, Inc | J | PRIVATE |
| 0734 | Muscatine Power & Water Company | J | PRIVATE |
| 0735 | Muskegon County Health Department | G | COUNTY AGENCY |
| 0737 | N G K Metals Reading, PA | J | PRIVATE |
| 0750 | NC Dept Of Environment, Health And Natural Resources | F | STATE AGENCY |
| 1297 | NESCAUM | J | PRIVATE |
| 0795 | NTH, Consultants, Ltd | J | PRIVATE |
| 0796 | NTIC Richfield Company | J | PRIVATE |
| 0797 | NY State Lead Sampling Lab | F | STATE AGENCY |
| 0798 | NYSDEC Toxics Data Laboratory | F | STATE AGENCY |
| 1245 | NYU - School Of Medicine | K | INSTITUTION |
| 0738 | Nassau County Department Of Health | G | COUNTY AGENCY |
| 0739 | Nassau County Health Department | G | COUNTY AGENCY |
| 0740 | Natchez Fire Department | H | CITY AGENCY |
| 0741 | National Bureau Of Standards | N | FED NONMILITARY |
| 0742 | National Climatic Center, Us Department Of Commerce | N | FED NONMILITARY |
| 0743 | National Lime And Stone Company | J | PRIVATE |
| 0744 | National Oceanic And Atmospheric Administration/Umo | N | FED NONMILITARY |
| 0745 | National Park Service | N | FED NONMILITARY |
| 0746 | National Southwire Aluminum Company | J | PRIVATE |
| 0747 | National Weather Service | N | FED NONMILITARY |
| 0748 | Natural Gas Pipeline Company | J | PRIVATE |
| 0749 | Natural Resource Ecology Laboratory | J | PRIVATE |
| 1269 | Naval Surface Warfare Center, Crane Division, IN | L | MILITARY |
| 0751 | Ndo Utilities Commission | H | CITY AGENCY |
| 0752 | Nebraska Department Of Environmental Control | F | STATE AGENCY |
| 0753 | Nebraska Public Power Company | J | PRIVATE |
| 0754 | Needles City Hall | H | CITY AGENCY |
| 0755 | Nekoosa Packaging Company | J | PRIVATE |
| 0756 | Network Environmental, Inc | J | PRIVATE |
| 0757 | Nevada Division Of Environmental Protection | F | STATE AGENCY |
| 0758 | New Albany And Floyd County Health Department | H | CITY AGENCY |
| 0759 | New Butte Mining Incorporated | J | PRIVATE |
| 0760 | New England Ethanol, Auburn | J | PRIVATE |
| 0761 | New England Power Company | J | PRIVATE |
| 0762 | New Hampshire Air Resources Agency | F | STATE AGENCY |
| 0763 | New Jersey Institute Of Technology | K | INSTITUTION |
| 1338 | New Jersey Meadowlands Commission | F | STATE AGENCY |
| 0764 | New Jersey State Department Of Environmental Protection | F | STATE AGENCY |
| 0765 | New Mexico Environment Department | F | STATE AGENCY |
| 0766 | New Rochelle Department Of Public Health | H | CITY AGENCY |
| 1346 | New York City Department of Health and Mental Hygiene | J | PRIVATE |
| 0767 | New York Port Authority And Environmental Management | J | PRIVATE |
| 0768 | New York State Department Of Environmental Conservation | F | STATE AGENCY |
| 0769 | Newport News Department Of Public Works | H | CITY AGENCY |
| 0770 | Niagara County Department Of Air Pollution Control | G | COUNTY AGENCY |
| 0771 | Noranda, Inc | J | PRIVATE |
| 0772 | Norfolk Health Department | H | CITY AGENCY |
| 0773 | North American Coal | J | PRIVATE |
| 0774 | North American Weather Consultants | J | PRIVATE |
| 0775 | North Carolina Department Of Water And Air Resources | F | STATE AGENCY |
| 0776 | North Carolina Dept Of Environment And Natural Resources | F | STATE AGENCY |
| 0777 | North Carolina State Board Of Health | F | STATE AGENCY |
| 0778 | North Carolina State University | K | INSTITUTION |
| 0779 | North Carolina Western Regional Air Pollution Control Agency | I | DISTRICT AGENCY |
| 0780 | North Central District Health Department | I | DISTRICT AGENCY |
| 1384 | North Central Texas Council of Governments | Z | OTHER |
| 0781 | North Coast Unified Air Quality Management District | I | DISTRICT AGENCY |
| 0782 | North Dakota State Department Of Health | F | STATE AGENCY |
| 0783 | North Dakota State University | K | INSTITUTION |
| 0784 | North Ohio Valley Air Authority | F | STATE AGENCY |
| 0785 | Northeast Colorado Health Department | F | STATE AGENCY |
| 0786 | Northeast Utilities | J | PRIVATE |
| 1260 | Northern Arizona University | K | INSTITUTION |
| 0788 | Northern Indiana Public Service Company | J | PRIVATE |
| 0789 | Northern Laboratories | J | PRIVATE |
| 0790 | Northern Sierra APCD | I | DISTRICT AGENCY |
| 0791 | Northern Sonoma County APCD | I | DISTRICT AGENCY |
| 0792 | Northern States Power Company | J | PRIVATE |
| 0793 | Northrop Services | J | PRIVATE |
| 0794 | Northwest Air Pollution Authority | I | DISTRICT AGENCY |
| 1392 | Northwest Clean Air Agency | J | PRIVATE |
| 0800 | O.M. Scott Company | J | PRIVATE |
| 0825 | OWR Grace | J | PRIVATE |
| 0801 | Office Of Director Of Public Works-Greensboro | H | CITY AGENCY |
| 0803 | Ohio Department Of Health | H | CITY AGENCY |
| 1256 | Ohio EPA Central Office | F | STATE AGENCY |
| 0805 | Ohio EPA, Central District Office | F | STATE AGENCY |
| 0806 | Ohio EPA, Division Of Environmental Services | F | STATE AGENCY |
| 0807 | Ohio EPA, Northeast District Office | F | STATE AGENCY |
| 0808 | Ohio EPA, Northwest District Office | F | STATE AGENCY |
| 0809 | Ohio EPA, Southeast District Office | F | STATE AGENCY |
| 0810 | Ohio EPA, Southwest District Office | F | STATE AGENCY |
| 0804 | Ohio Edison Company | J | PRIVATE |
| 1335 | Ohio University, Athens, OH | K | INSTITUTION |
| 0811 | Oklahoma City-County Health Department | G | COUNTY AGENCY |
| 0812 | Oklahoma Dept. Of Environmental Quality Air Quality Division | F | STATE AGENCY |
| 0813 | Olin Corporation | J | PRIVATE |
| 0814 | Olmstead County Health Department | G | COUNTY AGENCY |
| 0815 | Olympic Air Pollution Control Authority | I | DISTRICT AGENCY |
| 0816 | Omaha-Douglas County Health Department | H | CITY AGENCY |
| 0818 | Ontonagon WWTP | J | PRIVATE |
| 0819 | Orange City-County Health Department | G | COUNTY AGENCY |
| 0820 | Orange County Environmental Protection Division | G | COUNTY AGENCY |
| 0821 | Oregon Department Of Environmental Quality | F | STATE AGENCY |
| 0822 | Oregon State Board Of Health | F | STATE AGENCY |
| 0823 | Oregon State University | K | INSTITUTION |
| 1383 | Orsat | P | EPA REGION |
| 0824 | Owens-Corning Fiberglas Corporation | J | PRIVATE |
| 0826 | Oxychem Florida, Inc | J | PRIVATE |
| 0827 | P.R. Environmental Quality Board | F | STATE AGENCY |
| 1354 | PACE Analytical Services, Inc., MN | J | PRIVATE |
| 0840 | PBX | J | PRIVATE |
| 0847 | PEI Associates | J | PRIVATE |
| 0883 | PPG Ind, Inc | J | PRIVATE |
| 1375 | PSGC (Prairie State Generating Company, LLC), IL | J | PRIVATE |
| 0828 | Pace Analytical, Inc | J | PRIVATE |
| 0829 | Pacific Environmental Services | J | PRIVATE |
| 0830 | Pacific Gas And Electric | J | PRIVATE |
| 1348 | Pacificorp, WY | J | PRIVATE |
| 0831 | Packaging Corporation Of America | J | PRIVATE |
| 0832 | Palisades High School | K | INSTITUTION |
| 0833 | Palm Beach County Health Department | G | COUNTY AGENCY |
| 0834 | Panhandle Eastern Pipeline | J | PRIVATE |
| 0835 | Panhandle Health District | I | DISTRICT AGENCY |
| 0836 | Paoli Corporation | J | PRIVATE |
| 1220 | Parsons Engineering Science, Inc. | J | PRIVATE |
| 0837 | Pasadena Health Department | H | CITY AGENCY |
| 0838 | Pasco County Health Department | G | COUNTY AGENCY |
| 0839 | Payne And Dolan, Inc | J | PRIVATE |
| 0841 | Peabody Coal Company | J | PRIVATE |
| 0842 | Peavey Company | J | PRIVATE |
| 0843 | Pedco And Battelle | J | PRIVATE |
| 0844 | Pedco Environmental | J | PRIVATE |
| 0845 | Peerless Cement | J | PRIVATE |
| 0846 | Pegasus Gold Corporation | J | PRIVATE |
| 0849 | Penn-Dixie Industries, Inc | J | PRIVATE |
| 0850 | Pennsylvania Bureau Of Air Quality | F | STATE AGENCY |
| 0851 | Pennsylvania Department Of Environmental Protection | F | STATE AGENCY |
| 0852 | Pennsylvania State Department Of Forests And Waters | F | STATE AGENCY |
| 0853 | Pennsylvania State Department Of Health | F | STATE AGENCY |
| 0854 | Pennsylvania State University (Penn State) | K | INSTITUTION |
| 0855 | Penobscot Energy Recovery Company, Orrington | J | PRIVATE |
| 0856 | Peoria Office Of Director Of Inspections | H | CITY AGENCY |
| 0857 | Pepco | J | PRIVATE |
| 0858 | Perth Amboy City Hall | H | CITY AGENCY |
| 0859 | Pfizer Corporation | J | PRIVATE |
| 0860 | Phelps Dodge Corporation | J | PRIVATE |
| 0861 | Philadelphia Air Management Services | H | CITY AGENCY |
| 0862 | Philadelphia Div Air Pollution Control And Env Sanitation | H | CITY AGENCY |
| 0863 | Phillips Petroleum | J | PRIVATE |
| 0864 | Pima County Health Department | G | COUNTY AGENCY |
| 1394 | Pima County Regional Wastewater Reclamation Department | F | STATE AGENCY |
| 0865 | Pinal County APCD | G | COUNTY AGENCY |
| 0866 | Pine State Power | J | PRIVATE |
| 0867 | Pinellas County Department Of Environmental Management | G | COUNTY AGENCY |
| 0868 | Pinellas County Health Department | G | COUNTY AGENCY |
| 0869 | Pioneer Valley Tsp Group | J | PRIVATE |
| 0894 | Pitkin County Department Of Health | G | COUNTY AGENCY |
| 0870 | Pittsburgh Plate Glass | J | PRIVATE |
| 0871 | Placer Amex | J | PRIVATE |
| 0872 | Placer County APCD | I | DISTRICT AGENCY |
| 1287 | Planetgov User Support | J | PRIVATE |
| 0873 | Polk County Environmental Services Department | G | COUNTY AGENCY |
| 0874 | Polk County Physical Planning | G | COUNTY AGENCY |
| 0875 | Ponce District Hospital | I | DISTRICT AGENCY |
| 0876 | Popco | J | PRIVATE |
| 0877 | Port Arthur City Health Department | H | CITY AGENCY |
| 1337 | Port of Los Angeles | H | CITY AGENCY |
| 0878 | Porter County Health Department | G | COUNTY AGENCY |
| 0879 | Portsmouth City Health Department | H | CITY AGENCY |
| 0880 | Portsmouth City Health Dept Division Air Pollution Control | H | CITY AGENCY |
| 0881 | Potlatch Corporation | J | PRIVATE |
| 0882 | Powder River Coal Company | J | PRIVATE |
| 0884 | Prince George's County Health Department | G | COUNTY AGENCY |
| 0885 | Prince William County Health Department | G | COUNTY AGENCY |
| 1237 | Procter And Gamble Paper Products Company | J | PRIVATE |
| 0886 | Public Service Of Indiana | J | PRIVATE |
| 0887 | Pueblo Health Department | H | CITY AGENCY |
| 0888 | Puerto Rico Department Of Health | F | STATE AGENCY |
| 0889 | Puerto Rico Environmental Quality Board | F | STATE AGENCY |
| 0890 | Puget Sound Air Pollution Control Agency | I | DISTRICT AGENCY |
| 0891 | Pulaski County Health Department | G | COUNTY AGENCY |
| 0892 | Purdue University Civil Eng Department | K | INSTITUTION |
| 0893 | Putnam County Health Department | G | COUNTY AGENCY |
| 0895 | Quadri County Health Department | G | COUNTY AGENCY |
| 0897 | Qualitech | J | PRIVATE |
| 1266 | Quality Data Systems, Inc. | J | PRIVATE |
| 0896 | Quebecor | J | PRIVATE |
| 0898 | R-3, Inc | J | PRIVATE |
| 1312 | RJ Lee Group, Center for Laboratory Sciences Pasco, WA | J | PRIVATE |
| 0912 | RMT, Inc | J | PRIVATE |
| 1268 | RR Donnley, IN | J | PRIVATE |
| 0930 | RTP Environmental Associates | J | PRIVATE |
| 0899 | Radian Corporation | J | PRIVATE |