Great Smog of London 1952

The Great Smog of London in 1952 killed 4,000 people in just four days, as a dense mix of fog and coal smoke engulfed the city. An estimated 100,000 people fell ill due to the toxic air. This thick, yellowish "London Fog" was nicknamed "pea soupers". The last major fog occurred in 1962, after which the Clean Air Act significantly improved air quality.

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