Data collection primary monitoring variables

Despite the fact that exposure is one of the two primary variables, along with effects, used in assessing the hazard potential of a particular chemical substance, data often are not available on which to make a quantitative determination. This is because monitoring programs are often directed toward the already regulated pollutants and even when monitoring data are available, they rarely, if ever, contain the type of mass balance data required to reach a quantitative conclusion. Emphasis is therefore needed to refocus the efforts, both federal and private, which collect data related to exposure, to assure that they are maximally functional. 

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