EPA Staff Strengthen Advice For ‘Secondary’ NAAQS After CASAC Push

As EPA faces looming deadlines to revise its air quality standards, agency staff is recommending officials adopt tougher “secondary” air standards for nitrogen oxides (NOx), sulfur oxides (SOx) and particulate matter (PM) than those they floated in an earlier draft policy document, following criticism from agency science advisers seeking stricter limits. In a Jan. 12 final policy assessment (PA), the staff strengthen their earlier suggested pollution limits for the welfare-based secondary national ambient air quality standards (NAAQS), which will form...