DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
City air pollution. City air pollution dimming and reddening the Sun. 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 in Shanghai, China in the early afternoon. 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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