This gas is released naturally be decaying plants, animals, and sewage. It can be formed in small amounts when coal and oil are burned. Hydrogen sulfide occurs naturally in sewer gas, swamp gas, manure pits, volcanoes, and fossil fuels. Hydrogen sulfide is also created during the production of oil, rayon, paper and leather.
Some industries use hydrogen sulfide to make other chemicals.
People are exposed to hydrogen sulfide by breathing air that contains the gas. Hydrogen sulfide levels can be high near manure pits, paper mills, wastewater treatment plants, and other industries that produce the gas. Hydrogen sulfide is often found in sewer gas and can enter homes through dried-out sewer traps or clogged sewer vents. People who work at facilities that produce or use hydrogen sulfide are exposed to higher amounts than the general population. People who live near these facilities may also be exposed if an accidental leak occurs.