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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.
Deep inside the volcano, where pressure is high, the SO2 is dissolved in molten rock (magma). When the magma rises toward the surface, where pressure is lower, the gas bubbles out and escapes. Air pollution caused by SO2 and other gases emitted from Kilauea became a frequent problem on the Island of Hawai`i in 1986.Until that time, the volcano's ongoing eruption, which began in 1983, consisted of short, spectacular episodes of lava fountaining about once every 3 weeks.his choking haze was not caused by a forest fire or industrial pollution but by light winds blowing gas emissions from Kilauea Volcano into the area. Kilauea Volcano on the Island of Hawai`i emits about 2,000 tons of sulfur dioxide (SO2) gas each day during periods of sustained eruption.