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Nitrogen Dioxide (NO2) Detection

Portable & fixed-point NO2 detectors for healthcare, pharmaceuticals, chemical manufacturing, agriculture, and environmental testing.

About Nitrogen Dioxide Detection

Nitrogen dioxide (aka nitrogen peroxide) exists in equilibrium with its dimer dinitrogen tetroxide. It presents as a reddish brown gas or yellowish-brown liquid when cooled or compressed.

The compound is an intermediate in nitric acid production; a nitrating agent in explosives; a polymerization inhibitor for acrylates; and an oxidizing agent in rocket fuels. Nitrogen dioxide has also been used to bleach flour.

Occupational Health/Toxicology

Nitrogen dioxide irritates mucous membranes, inciting cough and dyspnea. Higher concentrations produce changes in lung function in healthy subjects and lesions in the pulmonary tract of animals. In addition, high levels can interfere with the ability of the blood to carry oxygen—causing headache, fatigue, dizziness, and a blue color to the skin and lips (methemoglobinemia). Repeated exposure to high levels may lead to permanent lung damage.

Full record on nitrogen dioxide from Hazardous Substances Data Bank (HSDB), a database provided by the US National Library of Medicine.

The nitrogen dioxide entry from NIOSH’s Pocket Guide to Chemical Hazards.


In aerospace, NO2 is used as an oxidizer in rocket propulsion systems. Monitoring its levels is vital for safe handling and storage, as well as to ensure the effectiveness and safety of rocket launches. Read more...

In the chemical industry, NO2 is used in the production of nitric acid, an essential chemical for fertilizers and many other products. Accurate monitoring of NO2 is necessary to prevent occupational hazards and ensure safe production processes. Read more...


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