The momentum continues to build for a more stringent National Ambient Air Quality Standard for PM2.5. In June, EPA announced it would revisit the Trump Administration’s decision to keep the PM2.5 NAAQS at 12 ug/m3. In early October, EPA staff released a supplement to its assessment of the PM2.5 NAAQS. That supplement also supported a more stringent standard.
Now, the Clean Air Science Advisory Committee is about to weigh in. … More