Coal smut refers to a type of fungus affecting coal plants.

Coal smut can also denote a black powdery residue found in coal mining.

कोयले का काला धूल

English Usage: After mining, the workers were covered in coal smut.

Hindi Usage: खदान के बाद, श्रमिक कोयले के काले धूल में लिपटे हुए थे।