Toxic Substances

Evaluations of hazardous substances and their potential health effects, including Toxicological Profiles, ToxFAQs™ , and information on specific substances.

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Toxic Substances Portal

With one click, access the best science, the latest research, and the most important information about toxic substances.

  • Chemical Classifications
    The chemical classes used by ATSDR to address hazardous substances.
  • Don’t Mess with Mercury
    Resources to raise awareness of common mercury risks in schools among audiences within the school community.
  • Environmental Odors
    Here we provide answers to common questions on odors and health, approaches for addressing odors in your community, information on reporting odors, methods for conducting odor complaint investigations, and ways for community members and other groups to be involved in odor management decisions.
  • Interaction Profiles
    The ATSDR Interaction Profile succintly characterizes the toxicologic and adverse health effects information for mixtures of hazardous substances.
  • Minimal Risk Levels (MRLs)
    An estimate of the daily human exposure to a hazardous substance that is likely to be without appreciable risk of adverse noncancer health effects.
  • National Toxic Substance Incidents Program (NTSIP)
    The National Toxic Substance Incidents Program (NTSIP) collects and combines information from many resources to protect people from harm caused by spills and leaks of toxic substances. NTSIP gathers information about harmful spills into a central place. People can use NTSIP information to help prevent or reduce the harm caused by toxic substance incidents
  • Substance Priority List
    A list, in order of priority, of substances that are most commonly found at facilities on the National Priorities List (NPL) and which are determined to pose the most significant potential threat to human health due to their known or suspected toxicity and potential for human exposure at these NPL sites.
  • ToxFAQs™
    Frequently Asked Questions about contaminants found at hazardous waste sites.
  • Toxicological Profiles
    Toxicological information collected by ATSDR into a single document, available in hard-copy or on CD-ROM.

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