This is the third paper in a series describing an Eulerian transport/transformation/removal model (STEM-I). Simulation results for the period 4-9 July 1974 are compared with field data from the SURE experiment for the same period. Statistical analysis of the predicted and observed SO2 and sulfate concentration data sets are used for the comparisons. The STEM-I model overpredicted SO2 concentrations and underpredicted the sulfate concentrations. On average, the predicted amount of SO2 deposited exceeded the predicted sulfate deposited by eight times, and the predicted amount of SO2 deposited exceeded that being converted to sulfate by nearly an order of magnitude. Computed correlation coefficients were reasonably good. © 1988.