The paper presents a mathematical model and the results of numerical calculations designed to analyze and predict the distribution of pollutants in the atmospheric surface layer. The model accounts for the dynamics of pollutant concentration reduction due to their natural decomposition and photochemical transformation, the influence of changes in wind patterns and terrain topography, and variations in diffusion and turbulent mixing coefficients depending on the stability of atmospheric stratification. High accuracy and stability of results arc achieved through the use of a semi-implicit finite-difference scheme and the method of lines for solving the specified problems.

The paper presents numerical modeling of a three-dimensional wind velocity field in the atmosphere based on the Navicr-Stokes equations. A stable algorithm for solving the hydrodynamic problem using an implicit difference scheme and high-order approximation is developed. The model takes into account the spatiotemporal variability of air mass velocity in the u, V, and w directions, which allows for a more accurate description of the processes of pollutant transfer in the atmosphere.