The book presents the results of more than 20 years of research on the effects of dioxin toxicity, including molecular genetic effects. Their relationship with indicators of impaired health and development, which are diagnosed in residents of Vietnam exposed to dioxins, has been demonstrated. The current vision of the fundamentals of molecular toxicology of dioxins is outlined. For a wide range of specialists involved in the development of medical and biological aspects of environmental safety problems, it can be used as a training manual for teachers and students of universities.