a black, carbonaceous substance produced during incomplete combustion of coal, wood, oil, etc., rising in fine particles and adhering to the sides of the chimney or pipe conveying the smoke

also conveyed in the atmosphere to other locations.

to mark, cover, or treat with soot.

adjective

fuliginous

noun

blacken , coom , crock , dirt , fuliginosity , grime , grit , residue , sediment , smoke , smudge , smut