Personal exposure to potential hazardous air pollutants has been the target for environmental research in Sweden during the last decades. It is well known that different kinds of volatile organic compounds (VOC) at high concentrations can have seriousadverse effects on human health. Benzene for example is recognised as a human carcinogen (Victorin, 1993). Like other VOC benzene contributes to the ozone formation in and near cities.The main sources of personal exposure to benzene are associated with personal activities such as smoking cigarettes, driving or riding automobiles and using products that emits benzene. The most important outdoor sources are vehicle exhaust and industrial emissions (Wallace, 1989).In many developed countries monitoring networks that measure concentrations of VOC has been established. These networks consist of fixed point monitoring stations. These stations are well suited to evaluate the general pollution climate and to monitor trends, but they have shown not to represent the personal exposure of the general population.
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