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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.
An erupting volcano will release gases, tephra, and heat into the atmosphere. The largest portion of gases released into the atmosphere is water vapor.ome of these gases are transported away from the eruption on ash particles while others form salts and aerosols. Volcanic gases are also produced when water is heated by magma. Gases also escape from pyroclastic flows, lahars, and lava flows, and may also be produced from burning vegetation.