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The main gasses that are released during a volcanic eruption are water vapor, carbon dioxide, nitrogen, sulfur, and lesser amounts of chlorine, hydrogen, and argon. carbon dioâ¦xide, carbon monoxide, sulfur hydrogen.
As the magma rises to the surface and is erupted, the pressure decreases, and some of the gas is released. The main gases dissolved in magma are water vapor, carbon dioxide, and sulfur gases, with lesser amounts of hydrogen, hydrochloric acid, and hydrofluoric acid.n geothermal areas, such as Pohoiki, however, hydrogen sulfide is essentially the only sulfur gas emitted. Hydrogen sulfide, sometimes called sewer gas, is a toxic gas that irritates the eyes, nose, and throat and has a rotten egg odor.