PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
Recording atmospheric pollution. Results from an experiment using LIDAR (light detecting and ranging) laser equipment to measure atmospheric pollution due to aerosols (microscopic solid particles). The graph shows the presence of larger amounts of aerosols (orange) at altitudes below one kilometre, with the amount decreasing (blue) in the region up to 2.5 kilometres. It also shows the height the pollution is found at increasing with time. Natural examples of aerosols include dust, sand, salt and volcanic ash. Examples from human sources include soot and other particles from the combustion of fossil fuels. Excessive amounts of aerosols can be a health hazard. Photographed on 18 May 2005, in Paris, France.
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