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Known as the “Silent Killer,” H2S is highly flammable and toxic, even at low concentrations. It can easily build up in low-lying areas and confined spaces, and can quickly overcome unprepared workers.

Hydrogen sulfide (H2S), often called “the silent killer” is a colorless gas that can only be smelled at low concentrations. When the concentration is high enough, it deadens your sense of smell so you don’t even know it’s there.