This volume provides the documentations for the established BAT values and EKA, as well as for further biological exposure values, including an authoritative review of the available toxicological studies and data. For each substance, the metabolism and pharmacokinetics, critical toxicity, exposure and effects, suitable indicators of internal exposure, the evaluation of the BAT value and the correct interpretation of data are described. The basic physico-chemical data are also provided, making the documentations not only essential for the application of BAT values and EKA, but also provide a concise overview of biological monitoring for each substance.