Completely revised and updated, this edition introduces basic methods for evaluating work environments in search of threatening physical, chemical and biological agents, as well as hazardous ergonomic factors. The book is divided into relatively short units and appendices that provide concise overviews and descriptions of basic concepts, which are followed by practical technical exercises. These exercises foster the understanding of basic industrial hygiene principles and practices for collection, detection, identification, calculation, and interpretation of qualitative and quantitative data.