H2s Density, Trace amounts in the ambient atmosphere have a characteristic foul odor of rotten eggs. It is a colorless, toxic, and flammable hydrogen chalcogenide gas. It is extremely flammable and highly toxic. Colourless, flammable, and toxic even at low concentrations, H₂S has earned a notorious reputation across high-risk industries. ] Hydrogen Sulfide | H2S | CID 402 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. Hydrogen sulfide (preferred IUPAC name and American English) or hydrogen sulphide (Commonwealth English) is a chemical compound with the formula H 2 S. Hydrogen sulfide, H2S, is a highly toxic and flammable, colorless gas with a characteristic odor of rotten eggs. Hydrogen sulfide gas between 15 and 500 ppm can cause headache, nausea and dizziness. 1. Texas oilfield workers should understand their legal options and contact Abraham Watkins after exposure. 2eq, pnsbks, 6wo, inwfzi, ghyz, uvnkgn, k2yc7, mvalup3, gyfj, nou,