Hydrogen Sulfide
Hydrogen sulfide (also known as H2S, sewer gas, swamp gas, stink damp, and sour damp) is extremely flammable and highly toxic. Because it is heavier than air, hydrogen sulfide can collect in low-lying and enclosed spaces, such as manholes, sewers, and underground telephone vaults. Its presence makes work in confined spaces potentially very dangerous.
Resources
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OSHA - Hydrogen Sulfide Fact Sheet
https://www.osha.gov/sites/default/files/publications/hydrogen_sulfide_fact.pdf
Fact Sheet![](https://nassco.org/wp-content/uploads/2021/04/Navy_resources.png)
OSHA - Hydrogen Sulfide Quick Card
https://www.osha.gov/sites/default/files/publications/hydrogen_sulfide.pdf
Quick Card![](https://nassco.org/wp-content/uploads/2021/04/Navy_resources.png)
NASSCO - Hydrogen Sulfide Safety Summary
https://nassco.org/wp-content/uploads/2022/10/Hydrogen-Sulfide-Safety-Summary.pdf
Safety Summary