With assistance from NASA's AERONET team, an automated sun-tracking photometer (Cimel™ CE318) was installed at the Swamp Angel Study Plot for the National Snow and Ice Data Center - University of Colorado on October 5, 2005. This instrument makes multispectral measurements of atmospheric optical depth, detecting particulates and other aerosols. At 11,050' (3,368 m) this is the 2 nd highest elevation site in the global AERONET network. Data from the " Red Mountain Pass " site are presented on-line at AERONET's website