Pea soup fog (also known as a pea souper, black fog or killer fog) is a very thick and often greenish-yellow fog caused by air pollution that contains tarry soot particulates and the poisonous gas sulphur dioxide. This very thick smog occurs in cities and is derived from the smoke given off by the burning of soft coal for home heating and in industrial processes.
Pea soup fog (also known as a pea souper, black fog or killer fog) is a very thick and often greenish-yellow fog caused by air pollution that contains tarry soot particulates and the poisonous gas sulphur dioxide. This very thick smog occurs in cities and is derived from the smoke given off by the burning of soft coal for home heating and in industrial processes.
Source: Wikipedia "Pea soup fog" · CC BY-SA 4.0
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