This report describes a model for calculation of human exposure to air pollution. The model consist of two parts. In the first part air pollution concentrations are calculated, as function of space and time, by using an air pollution model (Omstedt, 1988, Robertson, 1989). Inputdata are routine meteorological data, emission data and background air pollution data.
In the second part of the model the population dynamics in cities are described by using detailed statistical data for the day- and nighttime populations, according to Szegö (1974, 1987).
The model is illustrated by two cases, Helsingborg and Örebro. The results are compared with exposure calculations from simplified methods.