Air Tox Environmental Company - Provides expert air quality management services to assist industry in meeting the increasingly difficult challenge of today's U.S. environmental regulations.

AirNova, Inc. - Services include stack testing, stationary source isokinetic sampling, continuous emission monitoring, compliance permitting, air toxics pollution emission sampling, ambient air quality dispersion modeling.

ETS Inc. - Air quality consulting firm, specializing in air emissions control, measurement, training, design, troubleshooting, and regulatory services. Roanoke, Virginia.

Clean Air Engineering - Environmental engineering, air testing, test equipment rental, EPA testing, stack testing, organics testing and particulate testing company. Strength lies in the synergy that comes from bringing these pieces together into an integrated whole.

Beaulier Dust Control - Consulting engineers in ventilation, dust control and pneumatic conveyor in various industrial sectors, including metallurgy, chemical, plasturgy, mining, transformation, wood and forest.

Monarch Separators, Inc. - Monarch Separators specializes in the engineering of standard and customized pollution control systems for various applications throughout the world

RAP Services - An independent air quality consulting firm which operates, maintains and repairs continuous emissions monitoring (CEM) systems for a variety of industries.

Liberty Engineering & Mfg. Co. Inc. - Consultants specializing in dust and fume control along with industrial ventilation systems. Located in Louisville, KY.

Analytical Testing Consultants Corporation - Provides quality air testing services and efficient answers to a vast array of air pollution problems.

Soils Control International - Offering dust control and soil stabilization solutions, including road base stabilization, and dust Control on roads, fields, airfields, embankments, and landfills. Developing products to build homes using blocks made on site, without mortar, ponds for water source, or waste treatment facilities.

Atlantic Environmental Inc. - Environmental testing and consulting company with experts in indoor air quality, ergonomics, industrial hygiene, safety, and environmental property assessments. Offices in New York, Atlanta and Chicago.

Mukasa Environmental - Helping businesses comply with APCD and AQMD air pollution control regulations. Serving Ventura, Santa Barbara, Kern County and Los Angeles areas.

ARI Environmental Inc. - ARI provides expert air testing services for industrial clients in the US and Canada. Stack and fugitive emissions testing and consulting since 1980. Offices in Houston, TX, New Orleans, LA and Chicago, IL.

Air Resource Specialists, Inc. - Provides air pollution monitoring and consulting services for industry and government.

M.J. Bradley & Associates - A strategic environmental consulting firm dedicated to air quality issues, energy policy, climate change, electric vehicles, renewable energy, fuel cells and emission credit management.

OdourNet - An international group of environmental consultants dedicated to the specialist field of odour assessment, advice on managing odour annoyance and odour abatement.

Clean Air Environmental - California firm specializing in air compliance, including heavy-duty diesel smoke testing, fugitive emissions testing, and engine emissions controls.

BCRA Scientific & Technical Services Limited - UKAS accredited environmental monitoring in the UK

Northern Environmental and Monitoring Services (NEMS) - An environmental consultancy providing specialist services to industry including air quality and stack emission monitoring, contaminated land surveys, noise assessment, environmental impact assessment and ISO14000 management systems and audits.

Air Compliance Testing, Inc. - Stack testing (EPA industrial air pollution testing), OSHA air compliance monitoring (Industrial Hygiene testing).

CETCON (Combustion and Environmental Testing Consultants - Comprehensive environmental source emission testing services for the gas processing, petrochemical, electric utility, pulp and paper, and general manufacturing industries. Tulsa, Oklhahoma.

Entech Northwest - Entech Northwest specializes in air quality consulting, environmental assessment solutions and management for air pollution and noise issues for the transportation and manufacturing sectors.

V&C Environment Consultants Pty Ltd - Environmental consulting services based in Melbourne Australia - Service include ISO 14001 development, EMS and risk auditing, training, licence applications and air dispersion modelling.

Cotmore Consultants - We provide a wide range of services from design and construction of clean rooms, containment suites and controlled areas to supplying the MAC 10 fan filter modules.

Trinity Consultants - Offers consulting, software, and training in air quality, including dispersion modeling, permitting, and compliance assessments. Dallas, Texas.

Air Quality Consultants, Ltd - Offering air quality services for local authorities, developers, and industry, mainly in the UK. Expert witness at public inquiries. Bristol, England.