text: Yes, and yes,  Volcanoes do produce sulfur it is actually used to determine the approximate time of an eruption along with seismology, a good example of this is your on a mountain side, and all the trees in an area are drown and there is no sings of birds, or small mammals, this is do to the sulfur gases escaping and killing every thing around it.  As for the relationship to hell the Greeks refereed to the mouth of a volcano to be the gates of Aries him self, do to the heat the, gases, and some of the sulfur formations that where formed by the volcano, (this is a yellowish colors cone that is shooting sulfur gas upward all the time) volcanism refers to theses as vents.  So yes, there is diffidently sulfur gas around volcano's, and yes for the longest time volcano's where referred to as the gates of hell.