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Hydrogen Sulfide Chemical Information Sheet. Hydrogen sulfide is a colorless gas with a rotten-egg odor. Some people can smell hydrogen sulfide at very low levels, as low as 0.5 parts per billion (ppb) in air. Most hydrogen sulfide in the air comes from natural sources. It is produced when bacteria break down plant and animal material, often in stagnant waters with low oxygen content such as bogs and swamps. Volcanoes, hot springs and underwater thermal vents also release hydrogen sulfide.
Because hydrogen sulfide is a gas, inhalation is the major route of exposure to hydrogen sulfide. Most human data are derived from acute poisoning case reports, occupational exposures, and limited community studies. In confined spaces, human acute poisonings continue to occur.6C3F1 mice (10 males and 12 females per group) were exposed to hydrogen sulfide concentrations at 14, 43, and 110 mg/m 3 for 6 h/day, 5 days/week, for 90 days (CIIT, 1983a). The mice in the control group were exposed to clean air only.