GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY
Photochemical smog. View across the city of Buenos Aires, Argentina, showing a brown layer of photochemical smog. This is a layer of polluted air trapped close to the ground. Pollutants such as nitrogen oxides and hydrocarbons are mixed in the layer, and degraded by ultraviolet light from the Sun. The resultant air is noxious and can lead to severe respiratory problems. The main cause of such smog in cities is traffic.
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