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Voyageurs National Park Preliminary Conceptual Model Preliminary Conceptual Model Summary Sulfate transported from south to southeast of the site, local and regional nitrate in the winter, and emissions from prescribed burns or from wild land fire in the early summer are the major causes of haze at the Voyageurs National Park. 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.