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

A semi-empirical two-compartment, constant parameter model is used to predi ct airborne and surface dust concentrations. The model parameters are air i n- and exfiltration, internal particle sources? surface deposition caused b y settling, Brownian and turbulent diffusion and thermophoresis, track-in o f dust particles and resuspension. Model predictions are calculated for som e typical scenarios, and the soiling rate of a vertical surface is calculat ed for a range of friction velocities and electric field strengths. Model s ensitivity is determined based on input parameter value distributions for a population of rooms estimated from published data. The predictions are sen sitive to track-in and resuspension rates on which field data thus are need ed. (C) 1999 Elsevier Science Ltd. All rights reserved.