Answer: sulfurous

AnswerCrossword Clue
SULFUROUSLike some pollutants
sulfurous(chiefly of vapor or smoke) Containing or derived from sulfur
sulfurousLike sulfur in color; pale yellow
sulfurousSulfureous
sulfurouscontaining sulphur in lower valency; pertaining to hellfire also SULPHUROUS
sulfurousMarked by bad temper, anger, or profanity