  The aim of this work is to simulate the pollutants transport in buildings.
Focusing mainly on the presence of CO2, firstly we resolve the airflow
equations for two typical validation cases, the Rao case and the IEA case.
These numerical results are compared to the most known software and they are
used to evaluate of the evolution of CO2 concentration in the different rooms.
In order to obtain the different parameters and filters of the proposed model
we use a statistical method based on Bayesian inference. The final comparison
of results is coherent but a complementary experimental procedure is necessary
to calibrate and refine the model
