On Friday, EPA released its “Policy Assessment for the Review of the Ozone National Ambient Air Quality Standards.” EPA staff concluded:
that it is appropriate in this review to consider a revised primary O3 standard level within the range of 70 ppb to 60 ppb. A standard set within this range would result in important improvements in public protection, compared to the current standard, and could reasonably be judged to provide an appropriate degree of public health protection.
As staff noted, the Clean Air Science Advisory Committee made the same recommendation…. More