The Great Smog of London was a severe air pollution event that affected London in December 1952 following a period of unusually cold and still weather. Combined with an anticyclone and windless conditions which collected airborne pollutants mostly arising from the use of coal, it formed a thick layer of smog over the capital. It lasted from Friday 5th December to Tuesday 9th December 1952, resulting in the worst fog London had ever seen. On the 9th December the weather changed and the fog dispersed as quick as it had arrived leaving a devastating aftermath.
A Government medical report in the weeks following the event estimated that up to 4,000 people had died as a direct result of the smog and 100,000 more were made ill suffering from respiratory problems. More recent research suggests that the total number of fatalities was considerably greater, probably around 10,000.
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