A balanced, comprehensive overview of Environmental Quality Standards (EQS), this book addresses the selection and prioritization of substances for standard derivation. With integrated content and up-to-date information on assessment of regulations that affect the derivation and use of EQS, it examines the derivation of these standards and their implementation to protect human health and the environment. Based on contributions from thirty-five scientists, regulators, and policy makers from eleven countries, the book explains how to derive environmental standards that are defensible from a scientific and socioeconomic perspective.