Story missing from my TV: Six Dead at Colorado Dairy

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22. Hydrogen Sulfide

Hydrogen sulfide is a colorless, flammable gas that smells like rotten eggs at low concentration levels in the air. It is commonly known as sewer gas, stink damp, and manure gas. At high concentration levels, it has a sickening sweet odor. At extremely high levels, a person can lose their ability to smell the gas and become unaware of its presence. This condition, known as olfactory fatigue, can also occur when people have been exposed to hydrogen sulfide for a longer period of time. Hydrogen sulfide is heavier than air, so it can build up in low-lying areas and enclosed spaces ...

https://doh.wa.gov/community-and-environment/contaminants/hydrogen-sulfide