The penetration of gaseous pollutants into buildings in the case of a sudden contamination of the outdoor air.

A sudden contamination of the outdoor air by some toxic gas can have several causes. The primary goal of the investigation was to determine the protection afforded by sheltering indoors. The object of a computational approach was a single family house with two floors. Three different models were utilized as computing tools: MOVECOMP to calculate the infiltration air flows, MULTIC to calculate the contaminant transport inside the building and TDYN to calculate the temperature decay of the building. The variation of the weather parameters was treated using the two-dimensional distribution of the outdoor air temperature and wind speed and a statistical approach. The results show the cumulative distribution functions of the relative doses inside the building for different tightness levels, exposure times and other relevant parameters.