The third edition of the Encyclopedia of Toxicology presents entries devoted to key concepts and specific chemicals, and is updated to reflect current advances in the field. It contains new information on nanotoxicology, epigenetics, persistent organic pollutants, computational toxicology and bioinformatics, controversial chemicals, and much more. Along with the traditional scientific entries, new articles focus on worldwide initiatives, the potential health and environmental effects of new technologies, and the societal implications of global legal and regulatory issues.