MEASUREMENTS OF DYNAMIC AND THERMAL FIELD IN A STREET CANYON. URBCAP NANTES'99

Nantes’99 is a first stage of the european project URBCAP . This project aims to validate the requested models to predict local air quality, and the time and space distributions of harmful pollutants within the different quarters of a city. These models are necessary to assess the urban pollution impact on citizen’s health. The experiment Nantes’99 took place in a street canyon of the city center of Nantes. Nantes’99 lasted all the month of June 1999 and the beginning of July 1999. The technical part of this experiment is successful and, as it has just ended, the analysis of the results is not yet completed. Nevertheless, the first observations of the background wind and temperature and the traffic flow are presented here, as well as measurements of time residence of balloons tracers in the street.