HYDROGEN SULFIDE (H2S)

Colorless with the characteristic foul odor of rotten eggs. It is toxic, corrosive, flammable, and explosive.
Heavier than air, density = 1,411 kg/m3
Lower explosive limit (LEL) = 4 %vol
Health exposure limits (Directive 2000/39/EC):
8 hours TWA = 5 ppm (7 mg/m3)
15 mins STEL = 10 ppm (14 mg/m3)