Abstract: The Appalachian Atmospheric Interdisciplinary Research Program (AppalAIR) at Appalachian State University is a cross-disciplinary, air quality and climate research and outreach center that satisfies the needs of the state and the region for long-term, continuous measurements of key aerosol, meteorological, and trace gas variables. AppalAIR’s semi-rural Western NC mountain location (1100m ASL) in Boone, NC (36.21N, 81.69W) makes it an ideal location for measurements that are representative of the Southeastern U.S.(SEUS). Due in large part to highly seasonally-variable secondary organic aerosols, the SEUS is home to the highest warm-season aerosol loading in the country but has lacked long-term sites devoted to monitoring of aerosol radiative properties and column-averaged loading. A NOAA-GMD collaborative aerosol monitoring site was established at AppalAIR in May 2009 and a NASA AERONET site in July 2010. In this talk, we will present initial results, along with 10 years of AOD measurements above Boone from the MODIS platform and a sample of measurements being made by student and public groups as part of our NASA-funded Climate Action Network through Direct Observations and Outreach (CAN-DOO). We will highlight the large seasonal variation in aerosol radiative properties (in the context of other North American NOAA-GMD sites), loading, and source types as well as the dependence of these on aerosol source region and meteorology. These measurements will lead to the first long-term quantification of aerosol direct radiative effects in the Southeastern U.S. and should contribute to improved aerosol parameterization in regional climate models such as the WRF-Chem. We will also discuss future expansion of these measurements to better understand aerosol chemistry and vertical structure and the relations between aerosols and regional precipitation.