Five basic groups of sources of introduction of dioxins into the natural environment are ditinguished: 1. outdated technology of the production of alkilo and arylohalogenoorganic bondings of chlorine and all bondings in the synthesis of which are applied halogens and solvents and catalyzers capable of acceleration of the synthesis of dioxins, as well as during the waste utilization processes, in the processing of which proper technological requirements and OSH regulations are not observed; 2. breakdowns associated with uncontrolled emission into the environment of products or semi-products of the chemical, petro- and carbo-chemical, pulp and paper and metallurgical industries; 3. emissions from enterprises utilizing thermal industrial and municipal wastes; 4. gases from power engines; 5. ground and deep waters. The primary source of dioxins in the human body is food, mainly that which contains animal fat. The contents of dioxins in animal fats is lower, the problem occurs in the case of edible parts of plants exposed to contact with dust containing dioxins present in the air. Dioxins present in soil are not transferred by the root system of the plant stem. The contents of dioxins in human tissue, to a great extent, depends on diet and mode of nutrition, and in obese people the total mass of dioxins in the organism is considerably increased.