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 PM<sub>10</sub> and PM<sub>2.5</sub> 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 PM<sub>10</sub> and PM<sub>2.5</sub> 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 PM<sub>10</sub> fraction, the content of the more dangerous PM<sub>2.5</sub> is quite high - about 50,5 %. It has been determined that in the PM<sub>10</sub> 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 PM<sub>2,5</sub> fraction - 82,5 and 17,5 %, respectively.