We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Transporto taršos sklaidos tyrimai AEROMOD modeliu Vilniuje.
- Authors
Konkovas, Sergejus; Stankūnavičius, Gintautas
- Abstract
The contribution of transport to Vilnius air pollution seems to be great. The AEROMOD pollution dispersion model was used in the current study to define the transport pollution impact on both short and long range time scales. The simulated highest transport-induced pollution in Vilnius in 2005, as a rule, fells to the areas with the most intensive traffic. The verification of simulated pollution includes the method of the emission and average velocity dependence. Referring to the variety of recently used Lithuanian transport vehicle types and using pollutant expansion functions (for particulate matter PM, carbon monoxide CO, nitrogen oxides NOx and carbon hydrate CH); pollution material average emission coefficients were defined for the main passenger and commercial vehicles of different categories. Experimental data were compared with observation data of the air quality station in Žirmunai. Pollution dispersion maps were compiled for every pollutant. The highest concentration was defined in the Ukmergė—Geležinis Vilkas crossroad. Two times lower concentrations were defined on the living areas of this region. The highest daily concentration of particulate matter in the surrounding air was 86 μg/m³, i. e. greater than the allowable limit value (50 μg/m³). With the margin of tolerance valid in 2005, the average concentration per year (23 μg/m³ ) did not exceed the established value (40 μg/m³). The highest simulated carbon monoxide concentration reached 8 μg/m³, which is lower than the allowable limit value (10 μg/m³). The average value per year is 2 μg/m³. The maximum daily concentration is 30 μg/m³, the average concentration per year being 30 μg/m3. The highest daily concentration of nitrogen oxides is 600 μg/m³, the annual average value is 200 μg/m³, which 5 times exceeds the limit value of the ecological threshold. The uncertainty of modelling results for the short-term CO and PM concentrations and the Žirmunai station observations is 60-70%. The least uncertainty was obtained for CO (0%). The PM uncertainty value is 48%. The modelled emission values (traffic data) are long-term values which can hardly reflect the real emissions. Pollution dispersion and meteorological conditions for a long-term mean concentrations are examined best of all.
- Subjects
VILNIUS (Lithuania); LITHUANIA; AIR pollution; NITROGEN oxide absorption &; adsorption; ECOLOGY education
- Publication
Geografija, 2007, Vol 43, Issue 2, p48
- ISSN
1392-1096
- Publication type
Article