Nitrogen dioxide (NO2) is one component of the highly reactive gases known as the oxides of nitrogen or nitrogen oxides (NOx). NO2 is created from the reaction of nitrogen and oxygen during the combustion process. Fuel and thermal are the most common formation types.
A higher risk area for industrial workers from NO2 is in poorly ventilated areas such as a confined spaces which can result in asphyxiation or toxic exposure. Emissions from power plants has also been found to cause lung function abnormalities in subsequent workers. Other common sources are from the emissions of cars, trucks, buses, and off-road equipment. Large cities with many motor vehicles, high temperatures, and lightning can heighten the levels in the air. NO2 and NOx is widely known for causing air pollution in the form of smog, acid rain, and tropospheric ozone.
Type: Electrochemical
Range: 0-50 ppm (0.1 ppm resolution)
Low Alarm: 2.5 ppm
High Alarm: 5 ppm
STEL — 15 minute — Short Term Exposure Limit: 5 ppm
TWA — 8 hour time weighted average: 2.5 ppm