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Nitrogen Dioxide

High-purity nitrogen dioxide

Air Liquide manufactures nitrogen dioxide as a pure gas with purity up to 99%, or as part of a Scott™ brand specialty gas mixture that includes air or nitrogen. Nitrogen dioxide is used in many applications, primarily in environmental monitoring. Additionally, nitrogen dioxide in balances of air or nitrogen at various concentrations are used as span gas calibration mixtures for engine emissions testing in the automotive industry and are Part 86 compliant. When a smaller quantity of gas is warranted, Air Liquide delivers nitrogen dioxide mixtures in non-returnable Mini-Mix™ Transportable cylinders, designed specifically for industrial hygiene and safety and laboratory applications.


EPA Protocol Gases: Air Liquide offers Scott brand nitrogen dioxide two-component gas mixtures as EPA protocols. These EPA protocol gas mixtures are instrumental in helping you avoid non-compliance fines and downtime caused by inaccurate instrument calibration measuring emissions. Air Liquide’s specialty gas manufacturing facilities are registered participants of EPA’s Protocol Gas Verification Program (PGVP). Protocol standards are dual-analyzed, and for each reactive component, two separate analyses are performed and analyzed directly against metrology institute standards to determine the concentrations. Certificates of Accuracy are provided with each cylinder.

CEM DAILY STANDARDS™: Nitrogen dioxide gas mixtures manufactured as CEM DAILY STANDARDS are used in applications where the use of EPA protocol gases are not required. Zero blend tolerance is available as a result of our proprietary ACUBLEND™ technology. As a result, multiple cylinders exhibiting identical concentrations may be ordered, minimizing the need to recalibrate each time you change out a cylinder. 

Related Supply Modes

Air Liquide packages nitrogen dioxide pure gases and gas mixtures in a variety of high-pressure compressed gas cylinders, including aluminum and non-returnable Mini-Mix, depending on the grade of pure gas or mixture composition, and your application.

Related Equipment

Air Liquide manufactures gas handling equipment designed to deliver nitrogen dioxide pure gas and gas mixtures safely to your point of use, including gas pressure regulators, gas manifolds and valves.