SANTA FE TECHNOLOGIES INC. / SCIENCE PHOTO LIBRARY SANTA FE TECHNOLOGIES INC. / SCIENCE PHOTO LIBRARY
Lidar map of air pollution. Map showing the density of airborne particulates over Albuquerque, New Mexico, made using a Lidar system. The colours represent the concentration of particulates in the air, from red (highest concentration) through yellow and pale blue to dark blue (lowest). The worst pollution is over a truck refuelling station next to a motorway junction. The yellow lines are roads. Lidar (Light Detection and Ranging) uses a laser to scan an area of sky. A telescope is coupled to the laser, and measures the amount of light scattered by air pollution back to the instrument.
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