Abstract
Before embarking on any pollution monitoring programme aimed at assessing the exposure of a population group, decisions must be taken as to the duration of the measurements and the locations of the sampling sites. These decisions require a knowledge of the way that pollution concentrations vary with time and with distance, and some incomplete but useful data obtained in the course of our work is presented here. Seasonal variations in the concentrations of airborne lead show a consistent pattern but there is no evidence of a seasonal variation in the concentrations of lead in dust. The short-term variations in airborne and dust lead are rather similar. Spatial variations over short distances (a few metres) are likely to be more important for dust-lead than for airborne lead, but it is quite possible to obtain representative dust-lead values by means of large-area sampling. There is little reason to dismiss as impractical, on the grounds of excessive temporal or spatial variations, the assessment of pollution from lead in surface dust.
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