tions and to what extent could or should internal WHO TEF factors be established in the future? EPA should consider the outcome of the IPCS TEF update meeting and incorporate the issues and changes into the Reassessment.

  • Updating the Reassessment. Although the Reassessment clearly states that the WHO TEFs of 1998 will be used for assessment and calculation, if or when TEF values are changed or new chemical TEFs are added by the current or future WHO TEF panels (such as the 2005 panel), EPA should consider incorporating the new TEF values and methods for TEQ determination.

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