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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.
Hydrogen sulfide is also used in chemical warfare. Many industrial entities, such as iron smelters, landfills, food processing plants and breweries, produce or use hydrogen sulfide.If one of them disposes of this gas improperly or releases it accidentally, unwanted emissions may escape into the air.ydrogen sulfide is also used in chemical warfare. Many industrial entities, such as iron smelters, landfills, food processing plants and breweries, produce or use hydrogen sulfide.