Hot spots of NOx emission from the cement factory main stacks

The aim of this study was to assess nitrogen oxides (NOx) dispersion from the main stacks of a cement factory in Doroud, Iran. The SCREEN3 software and Gaussian plume model were applied to predict and to compare the on-site NOx concentrations to provide relevant information on its emissions and dispersion. The results showed that within a radius of 400-650 m from the source, the estimated NOx concentrations were higher than the National Ambient Air Quality Standards for human health protection. Therefore, a distance higher than 650 m at downwind direction of the source was recommended for human settling and activities.