- A. P. Buck, Inc.
 - Maker of computer controlled, personal air sampling pumps. - Air Resource Specialists, Inc.
- Provides consulting and support services in air quality monitoring, modelling, analysis, compliance and pollution control.
- BIOS International
- Supplier of air sampling and air flow calibration instruments for industrial hygiene, environmental and laboratory applications.
- Eastern Technical Associates
- Provides opacity and visible emissions services including training, certification, and consulting.
- Environmental Technical Group, Inc.
- Specialises in air emissions testing, inventories, permitting, and modelling.
- KASSAY Field Services, Inc.
- Specialising in open-path FTIR air monitoring, testing and measuring air emissions at chemical, industrial, municipal and remedial sites.
- Meriter Company
- Stainless sampling canisters, portable air sampling systems, heating blankets, high purity components, assemblies and systems.
 Monox Limited
- Producing long life, low cost carbon monoxide sensors.- Multidata Group, The (1)
- Pacwill Environmental
- Offers a wide spectrum of air quality management testing equipment.
- Precision Gas Testing
- Specialing in testing, detection and measurement of pre & post combustion constituents in mine atmospheres at trace levels.
- Rupprecht & Patashnick Co., Inc.
- Monitoring and sampling equipment for particulate matter from ambient air and diesel engines, power plant emissions and catalyst kinetics.
- SKC Gulf Coast Inc.
- Providing the monitoring professional with the latest high quality air sampling equipment.
- SKC Inc
- Air sampling technology.
- VSI
- Provides air quality and meteorology consulting services, including monitoring air pollution, air quality and noise modelling, transportation modelling and a mobile ambient air monitoring platforms.
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