Abstract
The recent reduction in the lead content of petrol in the United Kingdom, following government legislation, has been used to investigate the relationship between lead in petrol and in outside air in urban environments. In parts of London and Manchester, the airborne lead concentration closely followed the petrol lead concentration, within a time resolution of about 1 month. These results indicate that, in these areas, the petrol lead content has a fairly direct and prompt effect on the urban air lead concentration, i.e. any environmental lead reservoirs in the pathway from petrol to air (and hence to man by inhalation) are not significant on this timescale. A small component of the airborne lead, apparently independent of the petrol lead, was also observed.
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