The focus of the profiles is on healTh aiid toxicologie information; therefore, each toxicological profile begins with a public health statement that deseribes, in nonteclinical language. a substance's relevant toxicological properties. Following tlie public health statement is information conceming levels of significant human exposure and, where known, sigmficant healtli effects. The adequaey of information to détermine a substance's health effects is desenbed in a health effects summary. Data needs that are of sigmficance to protection of public health are identified by ATSDR and EPA.