DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Polluted sunset. Sunset darkened and reddened by smog over a city built on the banks of a river. Tiny particles of soot in the smog affect the sunlight by scattering blue and green light, making the Sun appear red. Soot is made of unburnt carbon and indicates the incomplete combustion of organic material such as fossil fuel. Photographed on the Huangpu River in Shanghai, China. As most of Shanghai's population do not own a car, the city's air pollution problems are mainly caused by industry.
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