Pollen

Pollen is by definition an air pollutant, as it can affect human health and well-being. Because of the particular aspect of this type of particles, the model usually used by AIR&D is not sufficient. Therefore, a pollen dispersion module has been developed and integrated to the 3D model developed by AIR&D.

This module was used to model the transport of pollen from trees located on Place de la République in Strasbourg.

Canyon street effect

A canyon street is a street, usually narrow, with buildings on either side of it following each other over a large distance. Recirculation phenomena are observed in this type of street, leading to higher concentrations of air pollutants. The concentrations are more or less high depending on the characteristics of the street (height of the upstream and downstream buildings, width and length of the street).

Our published research:

CFD evaluation of mean pollutant concentration variations in step-down street canyons

Annual average values

The modelling results do not allow direct comparison with the regulatory values prescribed by the European Union, or the guide values given by the World Health Organization. Indeed, the calculation of annual average concentration values requires the consideration of a large set of parameters (wind speed, wind direction, emissions, etc.). To overcome this problem, an innovative methodology has been developed by AIR&D.

Our published research :

Methodologies to assess mean annual air pollution concentration combining numerical results and wind roses