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FULL STORY. Hydrogen sulfide is a foul-smelling gas with an odor resembling that of rotten eggs. Sometimes called swamp gas, this toxic substance is generally associated with decaying vegetation, sewers and noxious industrial emissions.
A rotten egg smell is usually caused by an animal in the ventilation system. Sometimes a small rodent or bird will crawl into the vent while sick, or become trapped inside. Once the animal dies, the decomposing carcass gives off the smell. Once you turn on your HVAC system, the smell fills the entire house.