Sixty years ago thick smog descended on London, contributing to the deaths of an estimated 4,000 people.
The four-day "pea-souper", while worse than usual, was a familiar experience for Londoners.
Visibility was so poor buses and taxis ground to a halt, forcing commuters to hurry underground to use the Tube.
The legacy of the Great Smog was the Clean Air Act of 1956 which introduced a number of measures to reduce pollution.
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