The Great Smog of London remembered 60 years on

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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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