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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.
1 Hydrogen sulfide, or hydrosulfuric acid (H 2 S), is a gas that may occur in your household water. 2  Common names include stink gas and sewer gas. 3  Hydrogen sulfide is insoluble in water, but underground, this gas remains trapped within the water. Most people can smell hydrogen sulfide in water with a concentration of as little as 0.5 parts per million (ppm) . 2  Waters with concentrations from 0.5 to 1 ppm smell musty or swampy.. 3  Concentrations greater than 1 ppm smell like rotten eggs and are corrosive to plumbing.