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Environment
Air Liquide in the value chain

Stack testing

A stack test is a procedure for sampling a gas stream and then using that sample to determine a facility’s ongoing compliance with the emissions limits set forth by U.S. EPA regulations. Air Liquide offers ±1% Scott™ brand EPA protocol gases and CEM DAILY STANDARDS™ as calibration standards, as well as ALPHAGAZ™ brand pure gases engineered to help you accurately test and measure emissions monitoring analyzers. We also offer GMACS (Gas Manufacturer's Alternative Certified Standards) hydrogen chloride gas mixtures, an EPA-approved class of calibration standards specifically for monitoring HCl emissions at CEMS installations. Our extensive inventory of gas handling and distribution equipment allows you to safely store, handle and deliver these gases to your applications.

Gases

Equipment for specialty gases

Services

Brands

Resources

Why choose us?

  • 01

    Compliance experts

    Scott™ brand EPA protocol gas mixtures from Air Liquide provide the highest levels of performance, reliability and confidence for meeting EPA environmental compliance regulations.

  • 02

    Reliability

    Unique production technologies and ISO-accredited facilities ensure product reliability.

  • 03

    Innovative technologies

    Proprietary ACUBLEND™ technology ensures cylinder-to-cylinder and shipment-to-shipment repeatability across numerous locations. 

  • 04

    Industry experts

    With proven industry knowledge, we can advise on enhancing performance and efficiency in gas use for treatment of water, air and solid waste. 

  • 05

    R&D support network

    We rely on our global network of application experts, engineering and research and development teams to provide the optimum solution for a given need.