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Hydrogen Sulfide
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H2S is a colorless gas with the smell of rotten eggs in low concentrations. H2S is heavier then air, and will therefore sink to the ground.
H2S gas is very toxic, flammable(range 4.3–46%), explosive and corrosive.

From Wikipedia:

  • 0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of the compound.[18]
  • 0.0047 ppm is the recognition threshold, the concentration at which 50% of humans can detect the characteristic odor of hydrogen sulfide,[18] normally described as resembling “a rotten egg”.
  • OSHA has established a permissible exposure limit (PEL) (8 hour time-weighted average (TWA)) of 10 ppm.[19]
  • 10–20 ppm is the borderline concentration for eye irritation.
  • 20 ppm is the acceptable ceiling concentration established by OSHA.[19]
  • 50 ppm is the acceptable maximum peak above the ceiling concentration for an 8 hour shift, with a maximum duration of 10 minutes.[19]
  • 50–100 ppm leads to eye damage.
  • At 100–150 ppm the olfactory nerve is paralyzed after a few inhalations, and the sense of smell disappears, often together with awareness of danger.[20][21]
  • 320–530 ppm leads to pulmonary edema with the possibility of death.[11]
  • 530–1000 ppm causes strong stimulation of the central nervous system and rapid breathing, leading to loss of breathing.
  • 800 ppm is the lethal concentration for 50% of humans for 5 minutes exposure (LC50).
  • Concentrations over 1000 ppm cause immediate collapse with loss of breathing, even after inhalation of a single breath.[11]

Although respiratory paralysis may be immediate, it can also be delayed up to 72 hours.[22]

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