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Cedar Bluff Preliminary Conceptual Model Preliminary Conceptual Model Summary Due to the reason that a whole year of aerosol data is not available, no analysis about the 20% worst haze days can be done. Based on the data available from 6/2002-8/2003, sulfate transported from the east in the warm season, and regional nitrate in the cool season are believed to be the important causes of haze. Use the menu bar at the top of the page for more details on the preliminary conceptual model or download MS Word, PDF version here.