The Blood Lead Threshold

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Abstract
There is much evidence to support the view that threshold limits exist for toxic chemicals below which they exert no overt harmful effects. In the case of lead, however, there are grounds to believe that the present widely accepted threshold levels are too high and new upper permitted limits for adults and children are proposed. It is suggested that the main value of blood lead concentrations is to monitor abnormal exposure in a population, rather than to serve as a major diagnostic tool.