A major problem in the analysis of regional air pollution abatement (control) strategies is the collection and verification of an adequate data base. If computer programs (such as the Air Quality Implementation Planning Program (IPP)) are used, the scope of the data base must be expanded to include: Effective stack parameters and Regional cost data as an aid in the definition and use of these parameters, their sensitivity, with respect to pollutant concentration values and/or annual device cost are determined. The study utilizes the atmospheric diffusion model and the control cost model of the IPP. Since these models use generally accepted techniques, and have been verified through extensive use, the study conclusions and recommendations are generally applicable. Sensitivity analysis of the effective stack height parameters for individual sources is presented. Sensitivity analysis of the regional cost parameters with respect to the annual control cost of each physical device available in the IPP control cost model is also given.