DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Air pollution. Plume of smoke rising from a riverside factory. Smoke is comprised of tiny particles of soot. Soot is made of unburnt carbon and indicates the incomplete combustion of organic material such as wood, fibre or fossil fuel. The burning of these substances releases other pollutants, notably sulphur oxides. Smoke pollution is especially detrimental to health when it mixes with water vapour in the air to form smog. Smog irritates membranes in the mouth, nose and lungs and is a major cause of bronchitis, a lung disease. Photographed on the Huangpu River in Shanghai, China.
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