EPA science advisors’ recent peer review report on the agency’s draft evaluation of 1,3-butadiene (1,3-BD) offers a rare chapter of advice intended to broadly improve the scientific quality of TSCA risk evaluations of existing chemicals, underscoring concerns advisors have raised repeatedly in their reviews of individual evaluations. The Science Advisory Committee on Chemicals (SACC) calls the extra chapter in the June 1,3-BD report , “Essential Topics Not Posed Through Charge Questions” and “Topics Identified by the Committee as Important Considerations,”...