The Great Smog of London, or Great Smog of 1952, was a severe air pollution event that affected the British capital in early December 1952. A period of unusually cold weather, combined with a large region of high pressure and windless conditions, collected airborne pollutants—mostly arising from the use of coal—to form a thick layer of smog over the city. It lasted from December 3 to December 9, 1952, then dispersed quickly when the weather changed. 

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