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ATSDR's Substance-Specific Priority Data Needs (PDNs)

The ATSDR ToxGuides™ are quick reference guides providing information such as chemical and physical properties , sources of exposure, routes of exposure, minimal risk levels, children's health, and health effects.

An MRL is an estimate of the daily human exposure to a hazardous substance that is likely to be without appreciable risk of adverse noncancer health effects over a specified duration of exposure. These substance-specific estimates, which are intended to serve as screening levels, are used by ATSDR health assessors and other responders to identify contaminants and potential health effects that may be of concern at hazardous waste sites.

By Congressional mandate, the Agency for Toxic Substances and Disease Registry (ATSDR) produces toxicological profiles for hazardous substances found at National Priorities List (NPL) sites. These hazardous substances are ranked based on frequency of occurrence at NPL sites, toxicity, and potential for human exposure.

Information About Contaminants Found at Hazardous Waste Sites. The ATSDR Public Health Statements (PHSs) listed below are a series of summaries about hazardous substances developed by the ATSDR Division of Toxicology. The information in these PHSs has been taken from Chapter One of their respective ATSDR Toxicological Profiles.