Hydrogen Sulfide (H2S) Print

Hydrogen Sulfide (H2S) is an invisible but highly toxic gas. It is a product formed by the decomposition of organic matter in the presence of bacteria. Also called sour gas or stink gas, H2S is generally recognized by its rotten egg odor.

The human nose can normally detect the smell even at a low concentration level, however at higher levels, it quickly paralyzes the olfactory nerves and the nose’s ability to smell is deadened. At a concentration level of 1000 ppm and above, the effect of H2S can be immediately lethal.