The Great Smog of December 1952, the Five Days of Coal Fog That Killed Thousands of Londoners
From 5 to 9 December 1952 a windless anticyclone trapped London's coal smoke at street level. Visibility fell to arm's length, transport stopped, and cattle died at Smithfield. The official count was around 4,000 deaths; modern analyses put the toll at 10,000-12,000. It produced the Clean Air Act of 1956.
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