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Conceptual Model Site Setting Aerosol & Trends Analysis Backtrajectory Analysis PMF Analysis PMF Weighted Backtrajectory Analysis     Wichita Mountains Wilderness Area   Major emission source types and source regions responsible for haze   Figure 5.  North American SO2 emissions   Figure 6.  North American SO2 emissions         Figure 7.  Regional SO2 emissions   Figure 8.  Regional NOx emissions