what gases are in a volcano
The principal components of volcanic gases are water vapor (H 2 O), carbon dioxide (CO 2), sulfur either as sulfur dioxide (SO 2) (high-temperature volcanic gases) or hydrogen sulfide (H 2 S) (low-temperature volcanic gases), nitrogen, argon, helium, neon, methane, carbon monoxide and hydrogen.olcanic gases entering the atmosphere with dust and tephra during eruption of volcano Augustine, 2006.