The regulation of sources of air pollution has become more and more dependent upon the results of dispersion modeling with respect to maximum predicted off-property concentrations. When these predicted concentrations exceed the maximum ambient levels as defined by the state and EPA, the source is required to provide a solution that will result in lower predicted concentrations. This becomes difficult when the maximum ambient concentrations standards are extremely conservative and/or do not apply equally to all sources. This paper looks specifically at a cotton gin that cannot meet the required TSP (total suspended particulate) ambient levels based on modeling, due to inequitable enforcement of ambient standards.