ATSDR - Toxic Substances - Hydrogen Sulfide Carbonyl Sulfide
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Hydrogen Sulfide Carbonyl Sulfide

CAS ID #: 7783-06-4

Affected Organ Systems: Neurological (Nervous System), Ocular (Eyes), Respiratory (From the Nose to the Lungs)

Cancer Classification: None

Please contact NTP, IARC, or EPA’s IRIS Hotline with questions on cancer and cancer classification.

Chemical Classification: Inorganic substances

Summary: Hydrogen sulfide (H2S) occurs naturally in crude petroleum, natural gas, volcanic gases, and hot springs. It can also result from bacterial breakdown of organic matter. It is also produced by human and animal wastes. Bacteria found in your mouth and gastrointestinal tract produce hydrogen sulfide from bacteria decomposing materials that contain vegetable or animal proteins. Hydrogen sulfide can also result from industrial activities, such as food processing, coke ovens, kraft paper mills, tanneries, and petroleum refineries. Hydrogen sulfide is a flammable, colorless gas with a characteristic odor of rotten eggs. It is commonly known as hydrosulfuric acid, sewer gas, and stink damp. People can smell it at low levels.

Community Members 

Community Members
  • ToxFAQs : Carbonyl Sulfide

    Fact sheet that answers the most frequently asked questions about a contaminant and its health effects.

  • ToxFAQs : Hydrogen Sulfide

    Fact sheet that answers the most frequently asked questions about a contaminant and its health effects.

  • Public Health Statement : Carbonyl Sulfide

    Summary about a hazardous substance taken from Chapter One of its respective ATSDR Toxicological Profile.

  • Public Health Statement : Hydrogen Sulfide

    Summary about a hazardous substance taken from Chapter One of its respective ATSDR Toxicological Profile.

  • Emergency Responders 

    Emergency Responders
  • Medical Management Guidelines (MMG) for Acute Chemical Exposure

    Publication intended to aid emergency department physicians and other emergency healthcare professionals who manage acute exposures resulting from chemical incidents.

  • Toxicological and Health Professionals 

    Toxicological and Health Professionals
  • Toxicological Profile

    Succinctly characterizes the toxicologic and adverse health effects information for a hazardous substance.

  • ToxGuide : Carbonyl Sulfide (PDF, 112KB*)

    Quick reference guide providing information such as chemical and physical properties, sources of exposure, routes of exposure, minimal risk levels, children's health, and health effects for a substance.

  • ToxGuide : Hydrogen Sulfide (PDF, 120KB*)

    Fact sheet that answers the most frequently asked questions about a contaminant and its health effects.

  • Priority List of Hazardous Substances

    Prioritization of substances based on a combination of their frequency, toxicity, and potential for human exposure at National Priorities List (NPL) sites.

  • Minimal Risk Levels (MRL)

    The MRL is an estimate of the daily human exposure to a hazardous substance that is likely to be without appreciable risk of adverse, non-cancer health effects over a specified duration of exposure. The information in this MRL serves as a screening tool to help public health professionals decide where to look more closely to evaluate possible risk of adverse health effects from human exposure.

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