Sooty

Adjective

 * of, relating to, or producing soot
 * 1) soiled with soot
 * 2) of the color of soot

Thesaurus
besmirched, blotchy, dingy, dirty, dusty, fuliginous, grimy, grubby, grungy, messy, miry, muddy, murky, scruffy, slovenly, smirched, smirchy, smoky, smudgy, smutchy, smutty, snuffy, untidy