8 ppm of H2S will not kill you OSHAs PEL on H2S is higher than that.
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I was going to say, you can live for a short while in the presence of Hydrogen Sulfide. Just don't be there for a long time, and don't be in a confined space with it. Also you will know its there....It smells like rotten eggs. Experience: Navy Training, the Sewage System (CHT/VCHT) on board ship, is known to produce that stuff. The training goes like this; If you smell rotten eggs, and then smell nothing (it will burn out your olfactory gland) get out, close off the space, and report it so the nearest DC Locker can come back with SCBA's and those gas sniffers and find out for sure.