E2660-CO-NO2
Rev 06.04.2021
Nitrogen Dioxide
A Colorless toxic gas, relatively insoluble in water. When exposed to oxygen (including air),
nitric oxide is converted into nitrogen dioxide.
Chemical formula
NO
2
Molar weight
46
Relative gas density (to air)
1.59
Conversion
1 ppm = 1.88 mg/m
3
Boiling point
21.2 °C
Flammability
Powerful oxidize, can cause many organic substances
(wood, paper, oil, etc) to ignite.
Irritates the skin, eyes, and respiratory tract. Exposure to
levels above 100 ppm can cause death due to
asphyxiation from fluid in the lungs. There are often no
symptoms at the time of exposure other than a
transient cough, fatigue, or nausea, but over hours
inflammation in the lungs causes edema.
Odor
Characteristic pungent odor
Odor threshold
0.1 to 0.4 ppm
Hazards
Irritates the respiratory tract and eyes, at high
concentrations may cause lung edema and death.
Exposure
limits
(NIOSH)
ST REL
1.88 mg/m
3
/ 1 ppm
IDLH
37.6 mg/m
3
/20 ppm
Conversion of ppm to mg/m
3
is calculated for 25°C and 1 atm.
4
