Hungary toxic sludge reaches Danube River: Top 10 environmental disasters worldwide

1. London's 'Great Smog,' 1952

In this January, 1953 file photo, merchants sell smog masks in London.

In Dec. 1952, a thick, acidic smog enveloped London, lasting for four days. The smog, which came from fumes from coal stoves, industry and gas-burning cars, caused the deaths of about 4,000 people in a month and more than 8,000 in later months for reasons related to the smog.

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