This work aimed to model the dispersion of the traffic emissions for the first time in the area of Agadir city (Morocco). The estimate of road emission (from vehicle counts) was performed with Circul’air software version 4.0 which is based on the European methodology Copert 4. While the dispersion modelling was performed using SIRANE model, an important tool which adopts the classic NOx photochemical process. The input data are pollutant emissions, background concentrations, meteorological parameters and building configuration data from QGIS software as well as a list of other factors such as latitude, albedo, etc. Finally, the quality of the output results was validated by comparing observed measurements and modelled data.