In my lab it is not unusual to hear the sound of break glass... stuff happens, people drop things... sometimes you just have to breath the fumes from a broken bottle of gasoline for a little bit... but when you hear the sound of broken glass followed shortly by a scream and a quickly spreading smell of rotten eggs, you begin to panic... and when you realize that the bottle that had to have broken to make that smell contained enough hydrogen sulfide to kill several humans almost instantly... you begin to think of those you love... as death is imminent. A sample containing 200,000 ppm (20%) hydrogen sulfide in vapor broke in my lab Friday night... to put this in perspective...

0.00047 ppm is the recognition threshold, the concentration at which 50% of humans can detect the characteristic odor of hydrogen sulfide,[12] normally described as resembling "a rotten egg".
Less than 10 ppm has an exposure limit of 8 hours per day.
10–20 ppm is the borderline concentration for eye irritation.
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.[13][14]
320–530 ppm leads to pulmonary edema with the possibility of death.
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

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