Sulfur Dioxide (SO2) Primary Air Quality Standards - Litigation Associated with Current Review

Litigation associated with the current NAAQS review may involve schedules for the review as well as challenges to the final decisions, and court decisions in these matters.  

• Consent Decree Establishing Schedule for Final ISA, and Proposed and Final Rulemakings for SO2 Primary NAAQS Review, April 2017

You may also be interested in other documents from the current SO2 Primary NAAQS review.