Nitrogen dioxide is a gaseous air pollutant composed of nitrogen and oxygen and is included in a group called nitrogen oxides. Nitrogen dioxide is formed by burning fossil fuels such as coal, oil, gas or diesel at high temperatures. Nitrogen dioxide and other nitrogen (nitrogen) oxides in the outdoor air contribute to particulate pollution and chemical reactions that form ozone. Nitrogen dioxide is also formed indoors when fossil fuels such as wood or natural gas are burned.
-emisyon-tayini.jpg "Determination of Nitrogen Dioxide (NO2) Emission")
Nitrogen dioxide causes a number of harmful effects on human health, such as: inflammation of the airways, coughing and wheezing, weakening of lung function and causing asthma attacks. New research has revealed that nitrogen dioxide causes asthma in children. On the other hand, it has been determined that people with lung cancer are at risk of nitrogen dioxide, ozone and other outdoor air pollutants.
The main sources of nitrogen dioxide emissions are cars, trucks and buses. This is followed by power plants, diesel-powered heavy-duty machines and other moving engines and industrial boilers. It has been calculated that man-made sources emit over 15 million metric tons of nitrous oxide per year, mostly from burning fuels. Unless these sources are cleaned up, increasing nitrogen dioxide emissions will continue. Nitrogen dioxide concentrations are very high, especially in large urban areas and on or near heavily used roads.
In indoor environments, kerosene or gas heaters and gas stoves also produce significant amounts of nitrogen dioxide. Indoor nitrogen dioxide levels can rise if the ambient air is not completely exhausted.
On the other hand, nitrogen dioxide, besides being an important air pollutant, also reacts to form ozone and acid rain in the atmosphere.
There are seven nitrogen oxides in ambient air . Nitrogen monoxide and nitrogen dioxide are the two main nitrogen oxides associated with combustion sources. Ambient concentrations of these two gases vary greatly depending on the source, but in dense urban areas the combined concentration of these two exceeds 500 μg/m3.
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