What gases escape from volcaneos

Carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halidescarbon

The principal components of volcanic gases are water vapor (H2O), carbon dioxide (CO2), sulfur either as sulfur dioxide (SO 2) (high-temperature volcanic gases) orhydrogen sulfide (H2S) (low-temperature volcanic gases), nitrogen, argon, helium, neon, methane, carbon monoxide and hydrogen.