A two compartment model for determining the contribution of sources, surface deposition and resuspension to air and surface dust concentration levels in occupied rooms.

A semi-empirical two-compartment constant parameter model is used to predict airborne and surface du t concentrations. The model parameters are air in- and exfiltration internal particle sources, surface deposition caused by settling. Brownian and turbulent diffusion and thermophoresis track-in of dust particle and resuspension. Model predictions are calculated for some typical scenarios, and the soiling rate of a vertical surface is calculated for a range of friction velocities and electric field strengths. Model sensitivity is determined based on input parameter value distributions for a population of rooms estimated from published data. The predictions are sensitive to track-in and resuspension rate on which field data thus are needed