Seventy years ago, thick polluted smog descended on London bringing the city to a standstill and leading to the deaths of an estimated 4,000 people.

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The Great Smog of London lasted for four days. In response the government passed the Clean Air Act of 1956 to reduce the use of smoky fuels such as coal.

Witness History spoke to Dr Brian Commins, who worked for the Medical Research Council’s Air Pollution Unit set up at St. Bartholomew’s hospital in London in the 1950s.

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