Nitrogen dioxide The major source of nitrogen dioxide (NO2) is combustion of fossil fuels: coal, oil and gas. Most of the NO2 in cities is derived from motor vehicle’s exhausts. NO2 is a pollutant criterion that contributes to the formation of photochemical smog, which has significant impact on human health and the environment. Other sources of NO2 are petrol and metal refining, electricity generation from coal-fired power stations, other manufacturing industries and food processing. Inhalation of NO2 can cause respiratory tract irritation, exacerbation of chronic respiratory diseases such as asthma and bronchitis, and increased risk of respiratory infections. The result is wheezing, coughing, colds, flu and bronchitis, as well as more frequent and intense asthma attacks. NO2 cartridge The NO2 cartridge contains an electrochemical sensor with an embedded O3 filter, which eliminates the interferences produced by ozone, making the cartridge ideal for measuring the concentrations found in the atmosphere that may vary from very low levels in clean environments to high concentrations in polluted areas of cities or industries. The new Kunak algorithm corrects the effects of temperature and humidity in this cartridge, significantly mitigating the effect that these sensors suffer from fast humidity transients. Measurement range Response time Typical accuracy Typical slope Typical Intra-model variability Operating temp. range Operating RH range Recommended RH range Operating life Guarantee range