Map of Active Facilities with Current Air Permits
A Prevention of Significant Deterioration (PSD) Air Quality Analysis sometimes requires a cumulative modeling analysis. In a cumulative analysis, nearby sources of air pollutants must be included in the model. Appendix W to Part 51 of Title 40 of the Code of Federal Regulations, Guideline on Air Quality Models, explains this requirement in more detail along with a variety of guidance documents found on the U.S.