CASAC’s Majority Formally Rejects EPA Staff Call For Stricter PM2.5 NAAQS

November 14, 2019
Most members of a divided EPA Clean Air Scientific Advisory Committee (CASAC) are rejecting an EPA staff policy paper that called for tightening the annual fine particulate matter (PM2.5) ambient air limit to protect human health, with the majority instead saying the existing limit is sufficiently protective of the public. In a Nov. 13 draft letter to EPA Administrator Andrew Wheeler, CASAC endorses retaining the annual primary health-based national ambient air quality standard (NAAQS) for PM2.5 of 12 micrograms per...

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