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Abstract One of the dominant sources of air pollution affecting environmental living quality in urban areas is road traffic-induced air pollution. Providing information about traffic air pollution and finding out its distribution is therefore a crucial starting point for planning effective measures to improve air quality. Such information helps decision makers to optimize e.g. urban design. In the present work, a line source model, developed in laboratory of environmental physics, faculty of science at Qena, Egypt is proposed to describe the downwind dispersion of pollutants near roadways, at different cities in Egypt. The model is adopted completely Graphical User Interface (GUI) technique for operating in various windows-based microcomputers. The software interface and code have been designed by Microsoft Visual basic 6.0 based on the Gaussian diffusion equation. This software is developed to predict concentrations of gaseous pollutants (eg. CO, SO2, NO2 and particulates) at a user specified receptor. This thesis contains four chapters, summarized as follows: Chapter one gives a general introduction for air pollutant dispersion models and its applications. Also, necessity and the aim of this study have been presented. In this regard the main aim of this work is restricted to study air pollutant dispersion in urban environment released from a line source with the aid Gaussian model using computer simulation. In this consideration the following have been carried out: 1. Developing a predictive model using computer program designed by the authors using Microsoft Visual basic 6.0 to predict |