The article presents the results of long-term observations from 2014 to 2021, carried out using the stationary lidar complex (SLС) of the RC «Observatory of Environmental Safety» of the Saint Petersburg State University Science Park. Measurements were carried out on Line 10 of Vasilyevsky Island, 33/35, the location of the SLC with geographic coordinates: 59.943 N, 30.273 E. The favorable location of the SLC allows continuous monitoring measurements in the most anthropogenically loaded part of the city. Meteorological parameters were monitored using a Doppler lidar, which allows measuring wind speed and direction at altitudes up to two kilometers. Modeling the obtained optical data (backscattering and extinction coefficients) of the lidar signal made it possible to calculate the microphysical parameters of the aerosol, namely, the numerical concentration of aerosol particles over Saint Petersburg when the wind moves from different directions. The calculation results showed that the maximum atmospheric transport of aerosol particles was noted during the southeastern wind, the average content of aerosol particles was 3857 1/cm ³ in the layer from 300 to 500 m and 2886 1/cm ³ in the layer from 500 to 700 m. At the northeast wind direction, the cleanest atmosphere is observed: the aerosol content averages 2007 1/cm ³ at altitudes from 300 to 500 m, and 1684 1/cm ³ in the 500–700 m layer. The predominance of aerosol particles transfer from the southeast direction is most likely associated with a large number of industrial zones located in the southeast of Sait Petersburg and the Leningrad Region, and intense auto traffic.