This paper deals with the development of the method of determination of the mean value and standard deviation of the areas of aerosol deposition "spots" on the underlying surface. The probability density function of the aerosol deposition spots area on the underlying surface was obtained as an exact analytical solution of Kolmogorov equation. For the aerosol pollution dispersal in the air over Novosibirsk, some examples of the practical application of the probability density function are discussed.