Occupational toxicology is an application of toxicology to the chemical hazards of the workplace. Focusing on the substances and conditions encountered in the workplace where inhalation and skin exposure are most important, exposure to a mixture of chemicals with complex interactions, health affected by other environments and individual factors focuses on the effects of, or the identification of early aspects, more subtle effects than those found in clinical medicine [1]. It has a close interface with other sub-areas of occupational safety. Occupational epidemiological studies can stimulate toxicological studies of pathogens, and toxicological studies are important for establishing biomarkers for workplace health monitoring. Toxicology studies in the workplace can suggest or assess risk management used by occupational hygienists. Toxicology research is also important information for conducting occupational risk assessments and setting standards and regulations such as occupational exposure limits. Toxicological studies are laboratory studies of biological responses to substances and biological pathways and can generate data used in other occupational health and safety activities [2]. Occupational toxicology produces data used to identify risks and their physiological effects and quantify dose-response relationships.