The paper presents calculation results of the concentration of particles suspended in the air taking into account various geometric parameters of the emitter and especially its height and diameter on given examples. Situations have been considered where the emitted pollution comes from low emitters characteristic for single-family households, and then also from emitters of industrial type as well as high chimney stacks characteristic for thermal power plants. For the cases mentioned above, modelling was done of the geometric parameters of an open point source. The visualisation of results, presented in isoline maps of PM10 dust concentrations, has enabled an analysis of differences in immision and dispersion of the particles suspended in the air within the diameter ten times bigger than the height of the point source/emitter.