Staying compliant shouldn’t slow you down. WestAir delivers precise, ready-to-use calibration gases that keep your emissions monitoring accurate and your operations running smoothly—with California’s largest inventory of EPA Protocol gases ready when you need them.
10+ years of specialized chemists dedicated to precision and quality in EPA gas manufacturing.
Your dedicated account manager keeps your system running smoothly.
Easily reorder, manage invoices, and update billing all in one place.
Real-time tracking means you never run out or worry about inventory.
We tailor systems to boost your speed, safety, and efficiency.
Our delivery network ensures safe, on-time service when you need it.
Get the volume and grade packaging your operation requires.
We prepare and analyze all EPA protocol gases in strict accordance with the EPA Traceability Protocol for Assay and Certification of Gaseous Calibration Standards. Our rigorous process ensures complete traceability to NIST Standard Reference Materials (SRMs), giving you the confidence and documentation that regulatory compliance demands. This meticulous adherence to EPA standards is at the heart of our quality commitment, because accurate calibration starts with reliable, traceable reference materials.
Our team of specialized chemists are dedicated to precision and quality in EPA gas manufacturing, offering complete in-house capabilities from cylinder preparation to final certification. With trusted traceability through GMIS that complies with both VSL and NIST standards, we ensure full adherence to federal and state regulations, giving you the confidence and reliability your testing and compliance work demands.
ISO/IEC 17025 is the international standard for testing and calibration laboratories that sets out requirements for the competence, impartiality, and consistent operation of laboratories, ensuring the accuracy and reliability of their testing and calibration results.
Vacuum and bake process removes all contaminants and moisture
Specialized in-house mixture coats cylinder walls
• Controlled component addition • Final certification against GMIS standard
Learn more about the different EPA gases commonly used for testing.
NO
NO-containing Protocol gases are essential for calibrating the instruments that monitor industrial emissions, ensuring facilities comply with air quality regulations. Without accurate calibration standards, emission measurements would be unreliable.
NO₂
NO2 EPA Protocol Gases are needed to calibrate direct-reading analyzers that measure nitrogen dioxide in ambient air. These analyzers are used to monitor air quality and ensure compliance with National Ambient Air Quality Standards (NAAQS).
SO₂
Sulfur dioxide standards are used to calibrate Continuous Emission Monitors (CEMs) designed to measure SO₂ for compliance reporting. These monitors are critical for industrial facilities that need to track their emissions.
CO
Carbon monoxide standards are used to calibrate Continuous Emission Monitors (CEMs) designed to measure CO for compliance reporting. These are critical for tracking emissions from industrial sources.
CO₂
In EPA Protocol Gas Verification Program audits, samples consist of tri-blends containing NO, SO2, and CO2 (5% to 20% by volume) in balance nitrogen. The presence of percent-level CO2 changes the viscosity and molar mass of the audit gas compared to single-component standards, making it essential for realistic calibration conditions.
O₂
Oxygen concentration is a key indicator of combustion quality and is used to normalize other pollutant measurements. It helps determine whether industrial processes are operating efficiently and meeting environmental standards.
C₃H₈
Propane serves as the reference compound for measuring total volatile organic compounds (VOCs) and hydrocarbons in emissions. Since different organic compounds respond differently to flame ionization detectors, expressing results as “propane equivalents” provides a standardized way to report total organic emissions.
CH₄
Methane is both a greenhouse gas and a component of natural gas emissions. It’s also used as the reference compound for flame ionization detector calibration, making it essential for measuring total organic emissions accurately.
H₂S
H₂S gas standards with NIST-traceable certifications are used to calibrate hydrogen sulfide analyzers for ambient air monitoring, particularly for monitoring emissions from agricultural feeding operations (AFOs). Gas standards are prepared from the dilution of higher concentration (2-500 ppm) standard cylinders in zero air using a calibrated dilution system.
EPA REVIEWS
WestAir has been a trusted partner for our operations, providing critical specialty calibration gases essential for maintaining the accuracy of our Air Quality Management systems. Their reliable gas supply also supports effective emissions management in full compliance with state standards. We value their consistency, quality, and responsiveness.
“Quality and assurance are two non-negotiables in our line of work – Marco and WestAir consistently show up for us when we need them the most and I can better focus on operations knowing they’ll never let us down.”
Power plants use EPA Protocol Gases to ensure accurate emissions measurements to comply with regulations and contribute to cleaner air. Specialty gas producers use the protocol to analyze and certify gases sold to electrical utilities.
Refineries use EPA protocol gases for refining fuels and carefully monitoring emissions. This includes monitoring for SO2, NOx, CO, and hydrocarbons from various refining processes.
Chemical plants use EPA protocol gases for manufacturing chemicals while maintaining compliance, controlling costs and improving productivity.
The auto industry was involved in developing the EPA protocol and uses these gases for emissions testing and quality control.
Coal mines require custom calibration mixtures for monitoring air quality and safety in mining environments.
EPA protocol gases are specialized calibration gases used to calibrate instruments that measure air pollutants like carbon monoxide, sulfur dioxide, and nitrogen oxides. In smog inspections specifically, these gases ensure that the emissions testing equipment accurately measures the pollutants coming from vehicles.
EPA protocol gases are used throughout the aerospace industry primarily for calibrating emissions analyzers that test aircraft engines, auxiliary power units, and ground support equipment to ensure regulatory compliance.
Learn more about EPA Protocol Gases.
DA (150) Aluminum (150 cuft) QA (80A) Aluminum (80 cuft) GA (33A) Aluminum (30 cuft)
2-4 weeks for most products Depending on the components it could be anywhere from 2-6 if the components are more reactive.
Yes. Each of our cylinders come with a certificate of analysis. In addition, certificates of analysis can be requested upon request through your dedicated account manager or you can reach out to customer service for additional information or questions.
Yes. We carry both certifications and keep them in good standing every year.
Yes. Our dedicated account management and 24/7 emergency service is there to make a bad day better.
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