Nitrogen dioxide
Where is it found?
The major source of NO2 is combustion of fossil fuels: coal, oil and gas. Most of the NO2 in cities is derived from motor vehicle’s exhausts. Other sources of NO2 are petrol and metal refining, electricity generation from coal-fired power stations, other manufacturing indus- tries and food processing.
Why is it harmful?
Nitrogen dioxide (NO2) is a pollutant criterion that contri- butes to the formation of photochemical smog, which has significant impact on human health. Breathing increased levels of NO2 inflames the lining of the lungs and reduces immunitytolunginfections. Theresultis wheezing, cough- ing, colds, flu and bronchitis, as well as more frequent and intense asthma attacks.
NO2 cartridge
The Nitrogen Dioxide Cartridge has a built-in electrochemical sensor which has no interference with Ozone thanks to its embedded O3 filter, making the cartridge ideal to measure the concentrations found in the atmosphere, from very low levels in clean environments to high concentrations in polluted areas of cities or industries. However, the cartridge can be affected by fast humidity transients reducing its accuracy during these events.
Technical specifications
Type | Electrochemical |
Unit of measurement | µg/m³, ppb |
Measurement range(1) | 0 – 5,000 ppb |
Resolution(2) | 1 ppb |
Operating temperature range(3) | -30 to 40 ºC |
Operating RH range(4) | 0 to 99 %RH |
Recommended RH range(4) | 15 to 85 %RH |
Operating life(5) | > 24 months |
Guarantee range(6) | 20 ppm |
Limit of Detection (LOD)(7) | 2 ppb |
Repeteability(8) | 4 ppb |
Response time(9) | < 60 sec |
Typical accuracy (MAE)(10) | ± 5 ppb |
Typical precision R² (10) | > 0.85 |
Typical slope(10) | 0.78 – 1.29 |
Typical intercept (a)(10) | -4 ppb ≤ a ≤ +4 ppb |
DQO – Typical U(exp)(11) | < 25% |
Typical Intra-model variability(12) | < 1 ppb |
