Purpose. Development of the operational numerical model to compute contamination of the atmosphere over Pavlograd city in the case of solid rocket propellant ignition at the storage. Methodology. To simulate the toxic chemical dispersion (product of the solid rocket propellant firing) the equation of convective-diffusion transfer is used. This equation takes into account the toxic chemical dispersion in the atmosphere by wind and the atmosphere diffusion. To calculate the process of the indoor contamination in the case of the contaminated air infiltration a balance model is used. This model takes into account the ventilation flow rate, volume of the room, concentration of toxic chemical in the inlet air. To compute the ventilation flow rate the empirical model was used. The implicit change–triangle difference scheme was used for the numerical integration of the governing equation. FORTRAN language was used to develop code on the basis of the created numerical model. On the basis of the developed numeral model numerical experiment was carried out which allowed to estimate the level of atmosphere contamination in Pavlograd city. Findings. The operational model allows predicting quickly the hitting zone dimensions. The developed model was used to estimate risk of people toxic hitting in the residential districts of Pavlograd city. Originality. A numeral model allows to estimate the risk of toxic hitting of people in Pavlograd city in the case of an accident at the of solid rocket propellant storage. Practical value. The developed numeral model can be used for the quick estimation of risk for people in the city after toxic chemical release at the solid propellant storage. The developed numerical model solves the problem to assess the consequences for the population at ignition of solid rocket propellant in storage.