Abstract
If a governmental regulatory agency is to do its job most efficiently, it obviously must concentrate on those substances whose regulation most contributes to the public health. EPA must know not only the toxicity of the substance but also the population at risk. A toxic substance which may reach only a few persons in the community at best should have a much lower priority for control than a toxic substance which potentially can reach a large number of persons in a large number of communities. The pattern of possible population exposure is of critical importance in supplementing the toxicity profile for priority of control activity. It seems clear that EPA will have to rely increasingly on obtaining data from the 1970 Census of Population for small geographic areas to indicate the number and characteristics of people living within given distances from industrial sources of a host of chemical agents.
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