EPA Protocols Overview

On spec, all the time: Airgas EPA Protocol Gases
On spec, all the time: Airgas EPA Protocol Gases

A sustainable way to achieve regulatory compliance

EPA protocol gases are a necessary component of your operation, but you may find yourself facing some common hurdles when it comes to managing cylinder shelf life and your on-site inventory, staying in compliance and controlling costs. That’s why finding the right supplier for your EPA protocol gases is an important step that will directly impact the outcome of those goals.

When selecting your EPA protocol gas provider, it is imperative that the calibration standards are accurate, at the exact concentration range required, in the right amount, and available with simple and comprehensive cylinder management. Much depends on having easy access to inventory data, expiration information and Certificates of Analysis (COAs).

Solutions for your industry

Airgas, an Air Liquide company, is the industry’s leading authority on EPA protocol gases and associated applications. As part of the Airgas Specialty Gases offering, our EPA protocols are on spec, all the time. And, with the largest dedicated staff of specialists and account associates, we understand your concerns and challenges.

Whether you are an environmental manager at a power utility, an environmental specialist, a stack tester or a government employee, Airgas offers a wide range of environmental monitoring gases to help you achieve cleaner air through regulatory compliance.

  • Direct NIST traceability
  • Low-level single- and multi-component mixtures
  • Technical expertise
  • Largest U.S. supplier of EPA protocol gases


Talk to an Airgas specialist about achieving cleaner air, regulatory compliance and more.


Talk to an Airgas specialist about achieving cleaner air, regulatory compliance and more.

Built to make your job easier

When it comes to EPA protocol gases, you face challenges and considerations every day. Make sure you have the information you need when it comes to EPA protocols by exploring these sections designed to help you understand more and get more done. Have a question? Ask an Airgas specialist about EPA protocol gases.

Protocols 101—Do you need a primer on protocols? Learn about a range of protocol basics including COAs, zero gases, cylinder safety, and how to pick your protocol gases.

Manufacturing and Processes—Not all protocol gas providers are created equal. Discover how our technical capabilities and adherence to traceability makes Airgas EPA protocol gases uniquely poised to help you comply while controlling costs.

EPA Protocols Portfolio—Check out a comprehensive selection of products and services from the industry’s leading authority on EPA protocol gases and tap into the largest dedicated staff of specialists and account associates who understand your challenges. With our comprehensive US footprint, these products are ready when and where you need them.

Regulatory Updates—Regulations can and do change. Access our links to current EPA information to keep up with what’s going on and how regulatory updates can impact your operation.

Resources—Are you looking for a single-access point to multiple critical resources? Find what you need―including our glossary of gas terms, the Gas Encyclopedia, EPA shelf life recommendations and EPA Instrumental Test Methods―all in one place.

Accurate calibration standards within your reach

We understand the importance of accuracy and how it can impact your measurements. Our gas standards are made in strict accordance with EPA Traceability Protocol for Assay and Certification of Gaseous Calibration Standards and are certified to ±1%. For you, this means staying in compliance with access to some of the most accurate calibration standards on the market—you maintain uptime with the right amount of gas, when and where you need it.

  • Seven (7) EPA PGVP (Protocol Gas Verification Program) participating laboratories within the US
  • Seven (7) ISO/IEC 17025 accredited laboratories
  • More than 70 specialty gas facilities throughout the US
  • One of the largest US national distribution networks

All Airgas EPA protocol gases have direct traceability to standards from the National Institute of Standards and Technology (NIST). NIST trusts Airgas as the industry leader to produce Standard Reference Materials (SRMs) for gas mixtures that serve as the basis for production of all EPA protocol gases used in the United States for calibrating emissions monitoring equipment. We stock typical EPA protocol gases for quick access, and can engineer custom gas mixtures to meet your most difficult applications.

Applications for EPA protocol gases

  • Relative Accuracy Test Audits (RATA tests)
  • Linearity checks
  • Stack monitor calibration
  • Cylinder Gas Audits (CGAs)
  • Ambient monitor calibration
  • Scrubber efficiency verification
  • Certification of CEM systems
  • Environmental auditing

Manage your gas supply

Backed by our large infrastructure and technical expertise, you can count on us to meet your gas supply needs safely, accurately and cost-effectively. In addition to short lead times, we offer cylinder management services that help you further control costs. We stock the EPA protocol gases you need on your site plus you can maintain offsite inventory kept at your local Airgas branch. Our Airgas SRVS app brings you advancing technology that makes certificate data management more automated and error-free, and ultimately easier and more efficient for your team.