Conclusions Demonstrate utility of PGM's for single source AQ/AQRV impacts –Better chemistry, 3-D long-range transport/dispersion Results for inert/linear pollutants not so different –PGM resolution may play a role at short distances (<100 km) –High receptor density makes no difference at farther distances –Surprisingly, CAMx most dissimilar to CALPUFF/MMIF for 2005 gas SO 2 concentrations Visibility/deposition differences arise from HNO 3 /PNO 3 partitioning –HNO 3 has higher dry deposition rate –More PNO 3  larger visibility impact, lower N deposition –Partitioning of NO 3 during transport is important  POSTUTIL does not remedy this issue 23
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