What caused London's "pea-soup" fogs in the nineteenth century?

Name: What caused London's "pea-soup" fogs in the nineteenth century?
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The use of coal for heating was the main cause of London's "pea-soup" fogs in the nineteenth century. The burning of trash and smog from factories also contributed, but the widespread use of coal for domestic heating was the major contributor to the problem. Arson incidents were not a significant factor.

What Caused London's "Pea-Soup" Fogs in the Nineteenth Century