The model of atmospheric turbulence is considered which takes into account the single-point distribution laws as applied to pulsations of wind velocity and passive admixture concentration components. The relations between pulsations of wind velocity and concentration components are determined by the Reynolds stress tensor and the turbulent admixture flows. Based on these assumptions and using the simulation methods for pulsations of wind velocity and admixture concentration, the expression has been derived enabling estimation of the admixture concentration variance without solving the corresponding semiempirical equation. The obtained results are compared with the variance values found by traditional methods. The estimates of the application area of the proposed method are obtained.