%1

Adoption of Reference Exposure Levels (RELs) for carbonyl sulfide (COS) for use in the Air Toxics Hot Spots Program

Revised draft document summarizing the carcinogenicity and derivation of an inhalation cancer unit risk factor (URF) for tertiary-Butyl Acetate (TBAc).

EGBE REL document revised in response to the comments made by the SRP during the March 4, 2016 meeting. The values proposed are: Acute REL: 4700 µg/m3, 8–Hour REL: 164 µg/m3, Chronic REL: 82 µg/m3

Revised inhalation cancer Unit Risk for perchloroethylene is: 6.1 x 10^-6 (µg/m3)^-1, the inhalation Cancer Slope Factor is 2.1 x 10^-2 (mg/kg-day)^-1