Book excerpt: Provides info. about fluorine, hydrogen fluoride, & fluorides, & the human health effects of exposure. These chemicals have been found in many sites identified by the EPA for long-term Federal cleanup activities. Includes a Public Health Statement which explains toxicologic properties of fluorine, hydrogen fluoride, & fluorides in a nontechnical, Q&A format, & a review of the general health effects observed following exposure; a description of health effects; how the chemical can affect children; & info. on their chemical & physical properties, production, use & disposal, potential for human exposure, analytical methods, & regulations & advisories.