Sulfur dioxide (SO2) is a type of colorless volcanic gas.
The surface of the planet Alpha Onias III contained high, but non-toxic levels of sulfur dioxide, methane, and hydrogen sulfide. (TNG: "Future Imperfect")
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Memory Alpha
Sulfur dioxide (SO2) is a type of colorless volcanic gas.
The surface of the planet Alpha Onias III contained high, but non-toxic levels of sulfur dioxide, methane, and hydrogen sulfide. (TNG: "Future Imperfect")