STUDY OF HAZARDOUS POLLUTION OF ROADSIDE AIR WITH FINE SUSPENDED PARTICLES РМ<sub>10</sub> AND РМ<sub>2,5</sub> ON THE EXAMPLE OF SAINT-PETERSBURG
The paper describes the results of experimental and computational investigations of roadside air pollution with hazardous fine suspended particles PM10 and PM2.5 on the southern section of the Ring Road of Saint-Petersburg and in its vicinity. It has been found that under unfavorable transport and weather conditions, the concentrations of PM10 and PM2.5 exceeded the corresponding standard limit values by 3,8-5,0 times and 3,3-5,0 times, respectively. Analysis of the dispersion composition has shown that in the PM10 fraction, the content of the more dangerous PM2.5 is quite high - about 50,5 %. It has been determined that in the PM10 fraction, the share of exhaust particles and non-exhaust particles (deriving from tires, brake and road wear) is 51,3 and 48,7 %, respectively, and in the PM2,5 fraction - 82,5 and 17,5 %, respectively.