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This dataset is the data and metadata associated with the application of the US-PROPS model to the Great Smoky Mountains National Park (GSMNP). It is a geodatabase of species and vegetation classes across the GSMNP and describes the distribution of species, critical loads of different vegetation classes, and the changes in the occurrence probabilities for different scenarios explored. Users should start with the "Dataset_Descriptions.docx" file, and read McDonnell et al. (2022) for context (https://www.sciencedirect.com/science/article/pii/S2666765722001065). McDonnell, T.C., Clark, C.M., Reinds, G.J., Sullivan, T.J. and Knees, B., 2022. Modeled vegetation community trajectories: Effects from climate change, atmospheric nitrogen deposition, and soil acidification recovery. Environmental Advances, p.100271., This dataset is the data and metadata associated with the application of the US-PROPS model to the Great Smoky Mountains National Park (GSMNP). It is a geodatabase of species and vegetation classes across the GSMNP and describes the distribution of species, critical loads of different vegetation classes, and the changes in the occurrence probabilities for different scenarios explored. Users should start with the "Dataset_Descriptions.docx" file, and read McDonnell et al. (2022) for context (https://www.sciencedirect.com/science/article/pii/S2666765722001065). McDonnell, T.C., Clark, C.M., Reinds, G.J., Sullivan, T.J. and Knees, B., 2022. Modeled vegetation community trajectories: Effects from climate change, atmospheric nitrogen deposition, and soil acidification recovery. Environmental Advances, p.100271.

Although awareness that air pollution can damage vegetation dates back at least to the 1600s, the processes and mechanisms of damage were not rigorously studied until the late twentieth century. In the UK following the Industrial Revolution, urban air quality became very poor, with highly phytotoxic SO2 and NO2 concentrations, and remained that way until the mid-twentieth century. Since then both air quality, and our understanding of pollutants and their impacts, have greatly improved. Air pollutants remain a threat to natural and managed ecosystems. Air pollution imparts impacts through four major threats to vegetation are discussed through in a series of case studies. Gas-phase effects by the primary emissions of SO2 and NO2 are discussed in the context of impacts on lichens in urban areas. The effects of wet and dry deposited acidity from sulfur and nitrogen compounds are considered with a particular focus on forest decline. Ecosystem eutrophication by nitrogen deposition focuses on heathland decline in the Netherlands, and ground-level ozone at phytotoxic concentrations is discussed by considering impacts on semi-natural vegetation. We find that, although air is getting cleaner, there is much room for additional improvement, especially for the effects of eutrophication on managed and natural ecosystems.

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