Abstract
Within this research data from monitoring of ambient air quality in Devnya region for the period 2006 – 2012 regarding the concentration of oxides of nitrogen NOx has been analyzed along with data from monitoring of NOx and nitrous oxide N2O emissions from a nitric acid plant situated in the industrial zone of Devnya for the same period. Results indicate that NOx and N2O emissions have significant effect upon the quality of the atmospheric air in the region but monitoring data is not a sufficient source to assess the contribution of these pollutants to ambient air quality. A necessity of mathematical modeling the diffusion of N2O emissions is concluded having in mind the processes of photo dissociation, chemical destruction and dispersion of this air pollutant that occur in the ground atmospheric layer and estimating the effect of the secondary pollutants proceeded from these reactions upon ambient air quality.
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