EPA Publishes Default Values for New Chemicals Risk Assessments

EPA published the key 'default values' (assumptions) used in its risk assessments of new chemicals under TSCA. These default values are assumptions used by EPA in environmental release and occupational exposure assessments. The agency made these assumptions available on its website in the New Chemicals Division Reference Library. This transparency initiative enables manufacturers and submitters to better understand how EPA conducts risk assessments and to prepare more informed submissions.