Title Parkų potencialo įtaka oro teršalų pasklidai Šiaulių mieste /
Translation of Title Impact of the potential of parks on the dispersion of air pollutants in šiauliai.
Authors Valčiukas, Mindaugas
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Pages 69
Abstract [eng] Urban parks provide important ecosystem services such as reducing physical and chemical pollution. This is relevant when air pollution is still above regulatory limits. Nitrogen dioxide and particulate matter are among the most dangerous pollutants for human health and the environment. Trees in urban parks have the capacity to absorb pollutants, but their impact on the distribution of pollutants and their absorption efficiency are important factors. New knowledge could be useful for including green infrastructure as a potential tool for reducing air pollution in urban areas. The aim of this work was to determine the impact of parks in Šiauliai on the absorption and dispersion of pollutants and to provide recommendations for pollution management. To achieve this goal, nitrogen dioxide and particulate matter concentrations were investigated in parks in Šiauliai, each of which is dominated by different tree species. The data obtained were compared with site conditions and meteorological parameters, pollutant loads were determined and the causes of pollution were described. For nitrogen dioxide studies, the modified Griess-Saltzman method was chosen for the determination of nitrogen dioxide mass concentration. The principle for particulate matter is based on the aspiration of a small amount of air over a period of time. Excel and SPSS where used to analyses the data obtained. The results showed that nitrogen dioxide concentrations were higher in parks dominated by deciduous trees during the growing season, while nitrogen dioxide concentrations varied only slightly in the area planted with evergreen trees. Nitrogen dioxide concentrations depend directly on tree species and seasonality. During the growing season, nitrogen dioxide concentrations were higher in the central parts of urban parks, where deciduous trees predominate, than in the periphery. In May, in the central part of Berzynelis Park, the nitrogen dioxide concentration was 8,74 µg/m3, while in the periphery the concentrations were 2,61 µg/m3 and 2,22 µg/m3. In the spruce forest, dominated by coniferous evergreen trees, nitrogen dioxide concentrations were lower throughout the year closer to the anthropogenic source of air pollution. Particulate matter concentrations vary with ambient temperature and tree species. This study showed that particulate matter concentrations were lower in the central parts of urban parks than in the periphery of parks. In the central part of the central park, the average concentrations of particulate matter (PM2,5 and PM10) were 36,3% and 49,7% lower, respectively, than those closer to the anthropogenic air pollution source. Where evergreen trees predominate, particulate matter concentrations were lower not only during the growing season but also during the cold season.
Dissertation Institution Vilniaus universitetas.
Type Master thesis
Language Lithuanian
Publication date 2024