2025 , Volume 30, № 6, p.122-129

Thearticle presents an algorithm for the distribution of chemicals by hazard classes. Scientifically based limits of the toxicity classes of organic substances have been developed. Theclassification proposed in this study differs from the existing ones in a number of features: the numerical boundaries of the toxicity classes are not chosen arbitrarily, but are precisely determined by theoretical justification; hazard classes for various methods of exposure (through the stomach, on the skin, by inhalation) have a clear relationship with each other. This relationship is determined by the ratios obtained experimentally in numerous studies. The proposed classification can be considered as a result of the development and improvement of generally accepted classifications, the numerical characteristics of class boundaries in which do not have a clear theoretical basis. Software application has been developed to determine the toxicity classes of chemicals. This application allows adjusting the toxicity classes after adding new chemicals with known toxicity values to the database.