The Climatological Dispersion Model and the input data required for calculation of annual averaged values of sulphur dioxide concentrations at ground level are described. The most important meteorological input to the model is the long-term joint frequency distribution of winds in the vicinity of the sources of atmospheric pollution. These data are computed with the help of statistics of wind correlation between Fort McMurray and Mildred Lake, Alberta. Numerical experiments are performed with and without parameterized pollutant removal processes. The effect of incorporating terrain in the model is examined. Experiments comparing concentrations due to existing sources with those due to existing and future sources are performed. Results are also compared with observational data from pollution monitors and snowpack sampling. Estimates are made of sulphur loading due to dry deposition.