Extremely Hazardous Substances

The title is self-explanatory: Extremely Hazardous Substances, according to the Environmental Protection Agency. At present, the EPA maintains a list of 366 chemicals that are considered extremely hazardous or acutely toxic. For each chemical on the list, EPA provides a profile, containing chemical identity, synonyms, chemical formula, molecular weight, regulatory information, characteristics, health hazard data, fire and explosion hazard data, reactivity, precautions for safe handling, emergency protective equipment and emergency treatment information.