Further integration of different spatial scales in concentration modeling is important for assessing the European limit values for NO2. The local NO2-concentrations are influenced by the regional background, the local emissions and the street canyon effects. Therefore, it is important to combine all these contributions in the model chain that one wants to use for such an assessment. In this pap...

Busy street canyons can have a large flow of vehicles and reduced air exchange wind speeds at level, exposing pedestrians to high pollutant concentrations. The airflow tended move with along the canyon 1-s concentrations NO, NO2 CO were highly skewed close road more normally distributed sensors some metres above road. pollutants autocorrelated these elevated sensors, suggesting less variable co...

This article addresses the problem of urban street mapping from new high resolution satellite images. The proposed algorithm is divided in two sequential modules: a topologically correct graph of the street network is first extracted, and streets are then extracted as surface elements. The graph of the network is extracted by a following algorithm which minimizes a cost function. The surface ex...