EPA Draft Science Supplement Bolsters Case For Tougher PM Standards

EPA’s just-released draft supplemental science assessment of particulate matter (PM) health and visibility impacts reinforces earlier evidence supporting tougher federal air standards, bolstering agency efforts to tighten the limits in its ongoing reconsideration of a Trump-era decision that left them unchanged from 2012 levels. In its supplement to the 2019 integrated science assessment (ISA) that served as the basis for the Trump EPA’s decision, EPA staff finds that new science gathered since the 2018 cutoff for studies included in the...