It is primarily produced during combustion processes, such as in vehicle engines and power plants, where nitrogen in the air reacts with oxygen at high temperatures. In the atmosphere, it can combine with oxygen to form nitrogen dioxide (NO2), contributing to air pollution and the formation of acid rain.
Despite its toxic properties in high concentrations, nitrogen monoxide is also important in the human body, where it acts as a signalling molecule, particularly in regulating blood pressure and immune responses.
Colourless and odourless
Non-flammable
Reacts with oxygen to form nitrogen dioxide
Toxic at high concentrations
Short-lived in the atmosphere
More about nitrogen monoxide
How to detect nitrogen monoxide
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