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Conceptual Model Site Setting Aerosol & Trends Analysis Backtrajectory Analysis PMF Analysis PMF Weighted Backtrajectory Analysis Swanquarter Wilderness Area Major emission source types and source regions responsible for haze Figure 7. SO2 sources based on 2002 National Emission Inventory (NEI) database Figure 8. NOx sources based on 2002 National Emission Inventory (NEI) database