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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.
Volcanic Gas. During an eruption of a volcano, gases dissolved in the magma are released into the air. These gases can escape through many different places in the volcano, such as the large opening at the top or vents in the side.