Why are we recommending the 80th percentile as a minimum exposure value for risk management purposes?
Based on existing exposure information, the ARB, with concurrence from OEHHA, is recommending the interim use of the 80th percentile value (breathing pathway) as the minimum value for risk management decisions at residential receptors. This will continue to give health protective estimates that are consistent with previous risk assessment methods and provides continuity for the regulated community during the period of forthcoming changes to the risk assessment exposure methodology. The use of any single risk assessment result that is based on exposures less than the 80th percentile is not considered to be health protective nor prudent public health policy. The ARB will reconsider this interim risk management policy in its entirety as new scientific data (e.g. exposure information) are released by the ARB or OEHHA. At that time, all data, full exposure distributions, and methods that are published by the ARB or OEHHA will be used to determine future policies that are protective of publi
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