 ISSN 0235-7224 ISSN 2029-0586 (online) |
2008 m. Nr. 2 Dispersion modelling of solid particles from vehicle exhaust into the atmosphere
The research carried out in major towns has revealed that the highest level of pollution is registered during the morning and afternoon rush hours when traffic intensity is the greatest. Traffic pollutant emissions are very concentrated in streets of high traffic intensity, but at a distance of 1–2 meters and especially 4–6 meters from the carriageway their amount is sharply reduced. The concentration of aerosol particles is directly dependent on the intensity of the traffic flow. Their concentration is evenly reduces with the distance from the carriageway, and at a distance of 300 m particles tend to deposit on the ground surface. The research was carried out at 14 selected points of Vilnius, Žirmūnai neighbourhood streets, where the number of vehicles passing by (light, medium, heavy traffic) has been counted. The obtained results have been applied to determine the mean concentrations of solid particles (SP) in the morning and afternoon rush hours. The data were used for the mathematical modelling of solid particle dispersion in Žirmūnai neighbourhood. In some cases, the maximum allowable concentration (MAC) of solid particles was exceeded. Keywords: environment, atmosphere, air pollution, mobile recourses of pollution, solid particles, transport, modelling of pollution dispersion |
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