Is hydrogen sulfide dangerous to health?

Answer 1

Yes. There is a newly published article on the subject authored by Prof K de Meierleir in which he says he believes it is one of the processes involved in developing ME or CFIDS or CFS or PVFS.

There is an explanation in non-technical terms at the related link.

While it may cause damage even at relatively low concentrations, at high concentrations hydrogen sulfide is poisonous. To make matters worse, at high concentrations it has no odor since it deadens the sense of smell.