E&S developed a report for the National Park Service to evaluate differences in estimates of atmospheric nitrogen (N) deposition between two modeling methods (TDep and CMAQ) throughout the conterminous United States. At the national scale, estimates of total N deposition from TDep were generally higher than those from CMAQ. The extent to which these differences influence the interpretation of natural resources at risk from effects of N deposition was evaluated for 10 selected National Parks, including Acadia NP, Glacier NP, Grand Teton NP, Great Smoky Mountains NP, Joshua Tree NP, North Cascades NP, Rocky Mountain NP, Sleeping Bear Dunes NL, Theodore Roosevelt NP, and Yosemite NP. Results of this assessment highlight the importance of accurately modeling deposition to provide the foundation for informed management decisions. Full report available here.