Uncertainty in risk assessment: exceedence frequencies, acceptable risk, and risk-based decision making.


The use of "exceedence frequencies" is proposed as a means of evaluating the acceptability of uncertain environmental risks. A survey was conducted of U.S. Environmental Protection Agency personnel. When respondents were requested to identify preferred "acceptable" exceedence frequencies at four different regulatory risk thresholds (10(-3) to 10(-6), three… (More)


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