Where can it be found?

As a naturally produced gas from decaying organic matter, hydrogen sulfide can be released from garbage landfills, sewage sludge, swamps, liquid manure, hot sulfur springs, well water, and oil and gas wells. H2S also can be found in natural and volcanic gases. Hydrogen sulfide is commonly used and produced by several industries including oil and gas, mining, pulp and paper processing, and rayon manufacturing. Processes such as petrochemical refining, oil and gas drilling, wastewater treatment, sewerage operations, and hot asphalt paving can release hydrogen sulfide as a by-product. Hence, hydrogen sulfide may be found in underground tanks, sewers, manure storage tanks, manure pits, tunnels, wells, and confined spaces; around refining operations and livestock; and while processing pulp, paper, and textiles.