An introduction to risk assessment of chemicals and contains basic background information on sources, emissions, distribution and fate processes for the estimation of exposure of plant and animal species in the environment and humans exposed via the environment, consumer products, and at the workplace. It includes chapters on environmental chemistry, toxicology and ecotoxicology as well as information on data requirements, data estimation methodologies and intelligent testing strategies. It describes the basic principles and methods of risk assessment in the legislative frameworks of the European Union, USA, Canada, and Japan.