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What is the Great Smog of London?

The Great Smog of London, also called the Great Smog of 1952, was a lethal, fog generated primarily by coal emissions that hovered near the ground in London from December 5 to December 9, 1952. It was an unusually severe example of the city’s long-known “pea-souper” fogs, which were dense and yellow. The smog brought much of London to a near standstill and caused thousands of deaths. Its effects later led to major clean-air legislation in Britain.