The Great Smog of London (1952) was a disaster nobody saw coming. It wasn’t just fog - it was a toxic mix of coal smoke and chemicals that turned London into a gas chamber. Here’s what happened.

A London policeman wearing a mask for protection against the thick fog which hit most of the country and turned to smog in the city on Jan. 1, 1962. (Photo by Keystone/Getty Images) London's poor ...

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