Public comment period on the document "Draft Inhalation Cancer Unit Risk Factor for Perchloroethylene" begins on February 16, 2016 and ends on April 1, 2016.
Revised potency values for PCE are based on the elevated incidence of several tumor types observed in male mice and rats. Unit Risk Factor 6.1 E-06 (µg/m3)-1 Slope Factor 2.1E-02 (mg/kg-day)-1.
