EPA Staff’s PM Study Delays Process Changes For Future NAAQS Review

EPA staff’s just-released final integrated science assessment (ISA) that examines the health effects of particulate matter (PM) makes few changes from the proposed version that drew criticism from agency science advisers, delaying potentially fundamental changes to the scientific review process the advisors had sought for a future review. The final ISA , released ahead of its publication in the Jan. 27 Federal Register , downgrades the estimated health risks of very small ultrafine particles (UFP) but otherwise lacks any other...