ATSDR's Toxicological Profiles This link opens in a new windowToxicological profiles covering the effects of hazardous substances, chemicals, and compounds. Contains more than 40,000 pages of data from the printed version, including information on mitigation of health effects, data gaps, and all available health data. 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.