It gave off great clouds of toxic smoke, heavy with sulphurous acid gas and tinged with arsenic.
Alternatively, the sulphurous material on the surface may be endogenous.
The great majority are burning pit heaps, emitting at different times flames, and pungent and poisonous sulphurous and other smoke.
When mixed with water in the atmosphere, sulphur dioxide and sulphur trioxide produce sulphurous and sulphuric acids.
It includes sulphurous gases and causes serious anxiety and stress to my constituents.
