JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Air pollution in Mexico City, the capital of Mexico. The geographical location of this city, within a highland depression (2420 metres elevation), allows cold air to blanket the area and trap urban pollution. This pollution is produced by motor vehicles and industries, and can reach high levels. Restrictions on driving and industrial output, combined with environmental policing and fines, have improved air quality since the 1990s. Mexico City is one of the largest cities in the world, with an area of 1485 square kilometres and a population in 2013 of around 9 million. Photographed in 2015.
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