A routine mathematical model of a contaminating specie spreading in the boundary atmospheric layer after accidental emission is developed for organizing an optimal network of optical monitoring of industrial emissions into the atmosphere, based on a solution of system of equations involving:
1) equations of motion and turbulence energy budget for calculating the turbulence and wind modes;
2) equations of temperature and moisture transfer, accounting for their diurnal time–behavior;
3) equation of turbulent diffusion, describing transfer of a weightless passive contaminant for various scenarios of an accident; and,
4) the heat equation in soil and equation of heat balance of a surface.
Numerical calculations have been performed and general features of the evolution of a contaminant cloud at different values of the geostrophic wind G and the degree of roughness z0 are investigated. The results are compared with those calculated according to the Gaussian model of a diffusive flow. It is shown that the developed numerical model enables one to describe, better than the Gaussian method, the fields of a contaminant spreading during a nonstationary emission after an accident for assessment of the influence of industrial plants on environment and the development of the system of protection measures. These results and a PC compatible model can be used for optimization of the network of optical sensing, their density and location for various scenarios of accidents.