Heavy smog begins to hover over London, England, on December 4, 1952. It persists for five days, leading to the deaths of at least 4,000 people.
It was a Thursday afternoon when a high-pressure air mass stalled over the Thames River Valley. When cold air arrived suddenly from the west, the air over London became trapped in place. The problem was exacerbated by low temperatures, which caused residents to burn extra coal in their furnaces.
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