| 3E Company -- Carlsbad, CA |
| 3M Corporate Industrial Hygiene -- St. Paul, MN |
| A P Buck, Inc. -- Orlando, FL |
| Abbott Laboratories -- Abbott Park, IL |
| Absolute Air Quality -- Portsmouth, NH |
| Access Business Group -- Ada, MI |
| ACGIH -- Cincinnati, OH |
| Air Systems International, Inc. -- Chesapeake, VA |
| A-Line E.D.S. -- Waterloo, IA |
| American Analytical Laboratories, Inc. -- Akron, OH |
| Analytics Corporation -- Ashland, VA |
| Anglesey Aluminum Metal Ltd -- Anglesey, |
| Apex Environmental Consultants, Inc. -- Lenexa, KS |
| Architect of the Capitol -- Washington, DC |
| ART Corporate Solutions, Inc. -- Colorado Springs, CO |
| Asbestos Information Assn. of America -- Arlington, VA |
| Ashtead Technology Rentals -- Houston, TX |
| Assay Technology Inc. -- Pleasanton, CA |
| AT&T -- Londonderry, NH |
| Baron Consulting Co., Inc. -- Milford, CT |
| Baxter Healthcare Corporation -- Deerfield, IL |
| Benjel Chimistes Conseil, Inc. -- Saint-Hubert, QC |
| Bio Solutions, Inc. -- Coquitlam, BC |
| BIOS International -- Butler, NJ |
| Bioscience International, Inc. -- Rockville, MD |
| Board of Certified Safety Professionals -- Savoy, IL |
| Boggs Environmental Consultants, Inc. -- Frederick, MD |
| Brush Wellman, Inc. -- Cleveland, OH |
| BW Technologies -- Calgary, AB |
| Casella CEL, Inc. -- Amherst, NH |
| CCOHS -- Hamilton, ON |
| ChevronTexaco -- Richmond, CA |
| Chrysler Corporation -- Auburn Hills, MI |
| CIA -- Washington, DC |
| City of Springfield -- Springfield, MO |
| Colonial Metals, Inc. -- Elkton, MD |
| Commonwealth of Massachusetts -- West Newton, MA |
| Dakota Industrial Hygiene, Inc. -- Hermosa, SD |
| Deere -- Moline, IL |
| Delta Air Lines -- Atlanta, GA |
| Draeger Safety, Inc. -- Pittsburgh, PA |
| Duke Energy -- Charlotte, NC |
| EA Group -- Mentor, OH |
| Eagle Industrial Hygiene Associates, Inc. -- Horsham, PA |
| Eastern Analytical Services, Inc. (EAS) -- Elmsford, NY |
| Eastman Chemical Company -- Kingsport, TN |
| ECRI-MSLB -- Plymouth Mtg, PA |
| EHS-International, Inc. -- Bellevue, WA |
| Eli Lilly & Company -- Indianapolis, IN |
| EMSL Analytical, Inc. -- Westmont, NJ |
| Enercon Services, Inc. -- Tulsa, OK |
| Entech Instruments, Inc. -- Simi Valley, CA |
| ENVIRON CIENTÍFICA LTDA - Brazil -- SB do Campo SP, |
| Environmental Assessments & Solutions -- Scarsdale, NY |
| Environmental Monitoring Systems -- Charleston, SC |
| EORM -- Sunnyvale, CA |
| ERC Environmental Consultants, Inc. -- Houston, TX |
| Ergonomic Technologies Corporation -- Syosset, NY |
| ESIS Risk Control Services -- Cromwell, CT |
| EX3, Inc. -- Tempe, AZ |
| ExxonMobil Corporation -- Fairfax, VA |
| Federal Occupational Health -- Dallas, TX |
| FiberCom Laboratory -- Kingsport, TN |
| Five Boro Mold Specialist -- Brooklyn, NY |
| Fluor Hanford -- Richland, WA |
| Foster Products/SCB, Inc. -- Aurora, IL |
| Galson Laboratories -- E Syracuse, NY |
| GCI Environmental Advisory -- New York, NY |
| Grain Processing -- Muscatine, IA |
| Hamilton Associates, Inc. -- Owings Mills, MD |
| Hargrove and Associates, Inc. -- Mobile, AL |
| HazTek, Inc -- Medford, NJ |
| HEI Systems -- North Miami Beach, FL |
| HHMI-Janelia Farm Research Campus -- Ashburn, VA |
| HIH Laboratory, Inc. -- Houston, TX |
| Honeywell Analytics, Inc. -- Lincolnshire, IL |
| IAPA Information Centre -- Mississauga, ON |
| Indianapolis Public Schools -- Indianapolis, IN |
| Industrial Safety & Health Assoc -- Taipei |
| Industrial Scientific Corp. -- Oakdale, PA |
| Interactive Safety Products -- Huntersville, NC |
| ISTAR -- Gujarat, |
| James A. Haley VA Hospital -- Tampa, FL |
| Japan Assn Working Env Measurement -- Tokyo, |
| Johns Manville -- Littleton, CO |
| Keenan & Associates -- Torrance, CA |
| Kem Medical Products -- Fort Lauderdale, FL |
| Knorr Associates Inc -- Butler, NJ |
| Knowledge Management Innovations -- Oakville, ON |
| Kuwait Petroleum Corporation -- Kuwait, |
| Labour Department -- St. Michael, |
| Liberty Mutual Insurance Company -- Hopkinton, MA |
| Life Science Test Facility -- Dugway, UT |
| Lufkin Industries, Inc. -- Lufkin, TX |
| Machado Environmental Corporation -- Glendale, CA |
| MACS- Lab, Inc. -- Hayward, CA |
| Marine Chemist Service, Inc. -- Newport News, VA |
| McCabe Environmental Services, LLC -- Lundhurst, NJ |
| MeadWestvaco Corporation -- Glen Allen, VA |
| Medarex, Inc. -- Sunnyvale, CA |
| Mine Safety & Health Administration -- Arlington, VA |
| Mine Safety Appliances Company -- Pittsburgh, PA |
| Mold Inspection Specialists, Inc. -- Lincolnshire, IL |
| MST Inc. -- Hicksville, OH |
| National Guard Bureau -- Havre de Grace, MD |
| National University of Singapore -- Singapore, |
| NCRI -- Wichita, KS |
| New Jersey Motor Vehicle Commission -- Trenton, NJ |
| New York City Transit Authority - MTA -- New York, NY |
| NTA, Inc. -- Nappanee, IN |
| Occupational Health & Safety Center -- Manila, |
| Occupational Health Technologies Inc -- Colorado Springs, CO |
| Open Range Software, LLC -- Crossville, TN |
| Pb03 Environmental Testing & Svcs Co Inc. -- DeBary, FL |
| Pilgrim Interiors Inc. -- Chicopee, MA |
| PM Environmental -- Lansing, MI |
| Pure Air Control Services -- Clearwater, FL |
| Quality Air Controllers, Inc. -- Richardson, TX |
| QuanTEM Laboratories, LLC -- Oklahoma City, OK |
| RCM (Regulatory Compliance Mgmt) -- Countryside, IL |
| Research Triangle Institute -- RTP, NC |
| Restoration Consultants -- Sacramento, CA |
| RGA Environmental, Inc. -- Emeryville, CA |
| Scientific Analytical Institute -- Greensboro, NC |
| Sensidyne, Inc. -- Clearwater, FL |
| Sensors Safety Products, Inc. -- Raleigh, NC |
| Sherwin Williams Company -- Cleveland, OH |
| SiteHawk -- Smyrna, TN |
| SKC, Inc. -- Eighty Four, PA |
| Smithsonian Institution -- Washington, DC |
| SOS Mold, LLC -- Marina del Rey, CA |
| Spiramid, LLC. -- Chantilly, VA |
| State Compensation Insurance Fund -- Santa Ana, CA |
| Stockhausen, Inc. -- Greensboro, NC |
| Suntrac Services, Inc. -- League City, TX |
| SWS Environmental First Response, Inc. -- Panama City, FL |
| Synertech, Inc. -- Philadelphia, PA |
| Taiwan Institute of Occupational Safety & Health -- Sijhih City, Taipei County, 221 |
| TechniData America -- Wilmington, DE |
| Teck Cominco Metals Ltd. -- Trail, BC |
| Tetra Tech NUS, Inc. -- King of Prussia, PA |
| The Dow Chemical Company -- Midland, MI |
| The Society for Protective Coatings -- Pittsburgh, PA |
| Thermo NITON Analyzers LLC -- Billerica, MA |
| Torrent Laboratory, Inc. -- Milpitas, CA |
| Travelers -- Windsor, CT |
| TRI Air Testing, Inc. -- Austin, TX |
| Tri-Tech Analytical Laboratories, Inc. -- Orlando, FL |
| UNESP -- Porto Alegre, RS |
| Union Tank Car -- Chicago, IL |
| United Sales Associates -- Cincinnati, OH |
| University of Alabama - Birmingham -- Birmingham, AL |
| University of California- San Francisco -- San Francisco, CA |
| University of Idaho -- Moscow, ID |
| University of Texas at Arlington -- Arlington, TX |
| Urschel Laboratories, Inc. -- Munster, IN |
| US Micro-Solutions Inc -- Greensburg, PA |
| USDOL/OSHA Cincinnati -- Cincinnati, OH |
| VetEquip, Inc. -- Pleasanton, CA |
| Veterans Health Care System of the Ozarks (VHSO) -- Fayetteville, AR |
| VHA CEOSH, Dept. of Veterans Affairs -- St. Louis, MO |
| Washington Group International -- Boise, ID |
| Washington Headquarters Services -- Washington, DC |
| West Chester University -- West Chester, PA |
| WorkCare, Inc. -- Anaheim, CA |
| WorkSafeBC -- Richmond, BC |
| WPC Engineering -- North Charleston, SC |
| Zefon International, Inc. -- Ocala, FL |