- Air Analysis and Consulting Company
 - Air Consulting and Engineering Solutions
- Provides compliance management solutions to difficult environmental compliance issues.
- Applied Modeling Inc.
- Using advanced modelling technologies in mesoscale meteorology, air quality modelling, hazardous chemical safety and risk assessment.
- Atmospheric and Environmental Research, Inc.
- A research and development company involved in meteorological and environmental systems design and implementation.
- c4c GmbH
- Manages carbon offset projects.
- Conexor
- Environmental and air quality project management.
- E. H. Pechan & Associates, Inc.
- Environmental consulting, meeting planning, and management consulting services specialising in air pollution services.
- Earth Matters
- Helping public and private organisations create and implement air quality/transportation issue policies and programmes.
- Goodfellow Consultants, Inc.
- Environmental engineering, occupational health and safety, and indoor air quality.
- HWS Consulting Group Inc
- Services in transportation, geotechnical, asbestos/air quality, hazardous waste, landfills, water/wastewater, wetlands, and industrial hygiene/safety.
- Minnich and Scotto
- Air quality consultants providing open-path FTIR spectroscopy services.
- Restoration Consultants
- Home-office indoor environmental services; mould-sewage damage consulting, sampling, training.
- Sullivan Environmental Consulting, Inc.
- Provides air quality modelling and air monitoring services to various industry and government agencies.
- Theakston Environmental Consulting Engineers
- Services include modelling of exhaust gas dispersion, pedestrian level wind, snow accumulation, sun/shade, indoor air quality and dust dispersion.
- Trexler and Associates, Inc.
- Providing policy, project development, and emissions reduction/offset development and implementaion services.
- Trinity Consultants, Inc.
- Air quality consultants.
- Wilson Environmental Associates
- Provides ambient and indoor air quality consulting services.
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