CASAC Likely To Call For Significantly Tighter Annual And Daily PM Limits

EPA’s Clean Air Scientific Advisory Committee (CASAC) appears poised to back a significant strengthening of annual and daily federal limits for fine particulate matter (PM2.5), after a majority of members converged on a need for tougher standards to protect public health and go beyond EPA staff’s recommendation to tighten only the annual limit. During the second day of discussions by CASAC’s special panel overseeing EPA’s reconsideration of the Trump-era decision to retain all PM national ambient air quality standards (NAAQS)...