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Lt.(j.g.) Andrew P. Seaman (seated) and Cdr. John Adler of NOAA Research'sEarth System Research Laboratory, look at how aerosol particle detecting LaserImaging Detection and Ranging (LIDAR) works at the Global Monitoring Divisionatop the NOAA facility in Boulder, Colorado. The LIDAR reflects off pollutantsin the atmosphere and reveals their concentration at different altitudes.