How does the Derived (OEHHA) Cancer Risk method work?
This method applies to multipathway risk assessments and is described in detail in the OEHHA Air Toxic Hot Spots Program Guidance Manual for Preparation of Health Risk Assessment (August 2003). In brief, for a multipathway cancer risk assessment, the two dominant (driving) exposure pathways use the high-end point-estimates of exposure, while the remaining exposure pathways use average point estimates listed in the OEHHA HRA Guidance Manual.
