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Offers combustible and toxic gas monitoring instruments for over 150 gases. Fixed and portable instruments offered. IST employs solid state, infra-red, PID, electrochemical cell, and catalytic bead sensor technologies.

Custom manufacturer of Continuous Emissions Monitoring Systems (CEMS) for air emissions, gas sampling system components, and atmospheric corrosion test systems. Also offers service and maintenance, rents instruments, and buys/sells used instruments.

Manufacturer of continuous emission monitoring systems, for industries including utilities, pulp and paper, incinerators, and petrochemicals.

Manufacturer of professional quality air sampling equipment for the industrial hygiene, safety, environmental and occupational health markets world wide. (Sample pumps, constant flow samplers, calibrators, gas sample bags, VOC-sampling canisters, and more.)

Manufacture, sales and service of environmental testing equipment, FID's, NDIR, filters, sample lines, CEM systems, controllers and much more.

Stack testing (EPA industrial air pollution testing), OSHA air compliance monitoring (Industrial Hygiene testing).

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

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

Provides quality air testing services and efficient answers to a vast array of air pollution problems.

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.

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.

Comprehensive environmental source emission testing services for the gas processing, petrochemical, electric utility, pulp and paper, and general manufacturing industries. Tulsa, Oklhahoma.

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.

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

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