Which toxic gas, accumulating in manure storage systems, is highlighted as extremely toxic, causing rapid incapacitation at low concentrations?

Answer

Hydrogen sulfide (H2S).

Hydrogen sulfide, produced as manure decomposes in lagoons, pits, and tanks, is extremely toxic and capable of causing rapid incapacitation and death even at relatively low concentrations.

Which toxic gas, accumulating in manure storage systems, is highlighted as extremely toxic, causing rapid incapacitation at low concentrations?
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