It is oxidized in air into nitrogen dioxide NO2. Nitrogen dioxide is
a brown, toxic gas with a pungent odour.
NO and NO2 are named NOx.
These gases, along with sulfur dioxide, is
the source of the acidification in nature so that in recent years
new rules on NOX emissions have emerged.
Hygiencic threshold limit values:
Level value 25 ppm
Maximum value 30 ppm
Alarm should be adjusted to these levels with
level limit as the first alarm and maximum limit as second alarm
limit.
Sensor Placement
Nitrogen monoxide is slightly heavier than air, which theoretically
means that the gas will sink to the ground in air, but is also very
sensitive to draft, etc.
