This master thesis deals with the specific wind field of the eastern part of Graz and aims to identify its relevance for the air quality. The characteristics and the development of special wind systems- as well as how they influence each other are identified and discussed. In further consequences, the wind fields importance for the impact of the air pollution is demonstrated.The first section of this thesis gives a theoretical overview of the urban climate of Graz and the relevant factors the local wind circulations. Subsequently, the local and regional wind systems are investigated. A second theoretical part deals with the air pollution, more precisely the nitrogen dioxide and particulate matter pollution. The both backgrounds present the relevance of the wind field for the air quality in Graz.The main part deals with the analysis and interpretation of wind and pollutant data. In a first step, the characteristics of the wind field in average weather conditions are discussed and in a second, because of the occurrence of local winds in the east of Graz, the wind field is investigated additionally in autochthonous weather conditions. In a further step the detailed analysis of the air pollution and its point of origin are analysed. Through a simultaneously wind data and pollutant analysis mutual influences are detected. Moreover, by comparing the results of the pollutant and wind analysis with an estimation of the cold air production, the potential of the Mariatrost valley as a fresh air supplier is explored.The findings show, that the wind field in the eastern part of Graz is strongly determined by diurnal local wind systems. These local wind systems have a significant influence on the pollutant behaviour in this region. As a result, the interaction between these two systems can be confirmed. Lastly, the nocturnal cold air production in the Mariatrost valley could be measured and therefore the potential of this tributary valley as a fresh air supplier is confirmed.