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The soft coal was cheap and burned easily but produced vast amounts of smoke.—Robert Wyss, The Conversation, 21 Oct. 2025 Further, coal—particularly soft coal—produces soot, which choked some towns with dangerous particulates.—Clive Thompson, Smithsonian Magazine, 5 July 2022 The plants burn soft coal, or lignite, the dirtiest form of the fuel.—New York Times, 23 June 2022
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