Have you experienced the distinctive “rotten egg” smell of a hazardous gas called hydrogen sulfide (H2S)?
Occurring naturally from organic decay, for example, around sewage plants, H2S can be found in crude petroleum and natural gas — often in very high concentrations. Even at very low concentrations, 0.00047 ppm or 0.47 ppb, humans can begin to smell H2S.1 This is responsible for thousands of “nuisance odor” litigations and multimillion-dollar awards against oil and gas producers.