For the prediction of local and transient diffusion of pollutant gases from power plants and traffic sources, the Lattice Gas approach is proposed in this paper. The model was parameterised by some non-dimensional numbers that, together with physical data, define completely the case to study. The influence of such numbers is explored and a comparison is made with usual parameterisation of the turbulence in diffusional models. Several simulation tests allow to verify if the results of the model are, in the steady-state limit, coherent with the ones offered by the well validated and universally adopted Gaussian plume equation.
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