Atmospheric deposition can be an important contribution to nitrogen loading in coastal regions. Atmospheric loading is suggested to have declined due to pollution control efforts, however the degree and impact of this has not been quantified on Cape Cod. Additionally, it is predicted that climate change, especially with respect to rain events and durations, may interact with atmospheric conditions to affect estuarine productivity.  This project analyzed a long-time series of atmospheric N deposition and climate to determine trends and the associated impacts to estuarine systems.  We have compiled the data and examinied the trends. Results have shown significant decreases in NO3 deposition in the NE US, similar to those observed in other regions such as central Europe