Visit any geothermal area like Iceland, Yellowstone or Rotorua, and you notice a disgusting smell. The web-pages all discuss hydrogen sulphide, but there is something else, like burned bacon. I'm guessing some kind of sulphurous organic?
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2Hydrogen sulfide: eggs. Sulfur dioxide: garlic. – Gimelist May 20 '18 at 10:35
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I know about H2S and SO2, but that's not what I'm asking. There is some other smell as well. – Gordon Stanger May 21 '18 at 23:03