IT BEGAN ON THURSDAY, DECEMBER 4TH WHEN A HIGH –PRESSURE SYSTEM...

1952. It began on Thursday, December 4

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when a high –pressure system (warm air) coveredsouthern England. With the freezing-cold air below, heavy fog formed. Pollution fromfactories, cars, and coal stoves mixed with the fog. The humidity was terribly high, there wasno breeze at all. Traffic (cars, trains, and boats) stopped. People couldn’t see, and somewalked onto the railroad tracks or into the river. It was hard to breathe, and many people gotsick. Finally on Tuesday, December 9

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, the wind came and the fog went away. But after that,even more people got sick, many of them died.