The mathematical model has been developed for additives distribution in the atmospheric air considering its interaction with aqueous medium. It has been developed as a practical component of assessing the ecological safety level. A comparison of the model analytical and numerical solutions is represented. The model is applicable for solving educational and practical problems on prevention and elimination of negative effect from human activity.Для оценки уровня экологической безопасности разработана математическая модель распространения примеси в атмосферном воздухе с учетом ее взаимодействия с водной средой. Представлено сравнение аналитического решения с численным. Модель пригодна для решения учебных и практических задач по предупреждению и ликвидации негативных последствий хозяйственной деятельности.The mathematical model has been developed for additives distribution in the atmospheric air considering its interaction with aqueous medium. It has been developed as a practical component of assessing the ecological safety level. A comparison of the model analytical and numerical solutions is represented. The model is applicable for solving educational and practical problems on prevention and elimination of negative effect from human activity.