NOx-SOx-PM Standards Schedule Slips As EPA Rejects Further Review

EPA is rejecting its advisors’ call to revise the policy assessment (PA) underlying its plan to tighten “secondary” limits for nitrogen oxides (NOx), sulfur oxides (SOx) and particulate matter (PM), but is nevertheless delaying the plan’s release until April, casting doubt on whether it can be finalized during President Joe Biden’s current term. EPA Administrator Michael Regan told Elizabeth Sheppard, chair of the EPA’s Clean Air Scientific Advisory Committee (CASAC), in a Dec. 7 letter that the agency could not...