A method to calculate the process of contaminated air evacuation from the zone of toxic substance spillage with ventilators has been developed. The method is based on the numerical integration of 3D equation of pollutant transfer. Results of the calculative experiment have been provided.

A computer model to simulate the ammonia cloud concentration reduction with sprinklers which used water or acid was developed. The model is based on 3D equation of admixture transfer written both for ammonia and neutralizator. The results of numerical experiment are presented.