Abstract:
Nitrogen oxides, especially nitrogen dioxide, are pollutant substances that can affect the human health and the environment. Nitrogen dioxide emissions are important sources in the production of green house effect and photochemical smog. In the current global context when the accent on environmental pollution problems are more and more pressing, the reduction possibilities study of nitrogen dioxide emissions as well as the modelling ways of the phenomenon that accompany the dispersion of this pollutant in its cycle in nature is current and of a particular importance. In this paper the mathematical models that describe the dispersion of nitrogen dioxide emitted from the two thermal power stations (Center CET and South CET) of Timisoara city as a function of four meteorological parameters (temperature, humidity, pressure, wind speed) are presented. In order to develop and verify these models, the NO2 daily average concentrations emitted from the thermal power stations as well as the daily average values of meteorological parameters for each day of the months: January, April, July and October 2004 were used. The testing of the mathematical models has been done by using the following performance criteria: average squared deviation and correlation coefficient. The models, as resulted from the values of the performance criteria prove to be enough accurate to describe the nitrogen dioxide dispersion in atmosphere.
