Determination of Noncarcinogenic Risk

Noncarcinogenic risk is represented by the hazard index (HI), which is the ratio of the chronic daily intake to the RfD  

A hazard index of 1.0 represents an acceptable cumulative risk for all contaminants and routes of exposure. In other words, if the hazard index is 1.0, the receptors are exposed to concentrations that do not present a hazard because detoxification and other mechanisms forestall toxic effects that could result from exposure to the contaminant. The quantitative value obtained for the HI is not a value of risk it does not indicate the probability of harm as the result of exposure. 

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