U.S. Department of Health and Human Services, Center for Disease Control. July 2006. ToxFAQs™ for Hydrogen Sulfide (Ácido Sulfhídrico) In addition to methane, natural gas typically contains other hydrocarbons such as ethane, propane, butane, and pentanes. Raw natural gas may also contain water vapor, hydrogen sulfide (H2S), carbon dioxide, helium, nitrogen, and other compounds.
ATSDR serves the public by using the best science, taking responsive public health actions, and providing trusted health information to prevent harmful exposures and diseases related to toxic substances. ATSDR is directed by congressional mandate to perform specific functions concerning the effect on public health of hazardous substances in the environment. These functions include public health assessments of waste sites, health consultations concerning specific hazardous substances, health surveillance and registries, response to emergency releases of hazardous substances, applied research in support of public health assessments, information development and dissemination, and education and training concerning hazardous substances.
See: Dusty Horwitt. (2009). Drinking Water Threatened by Toxic Natural Gas and Oil Drilling Chemicals. Environmental Working Group.