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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    $\begingroup$ Hydrogen sulfide: eggs. Sulfur dioxide: garlic. $\endgroup$ – Gimelist May 20 '18 at 10:35
  • $\begingroup$ I know about H2S and SO2, but that's not what I'm asking. There is some other smell as well. $\endgroup$ – Gordon Stanger May 21 '18 at 23:03

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