Final EPA staff documents reiterate call to retain SO2 NAAQS

EPA staff has released final versions of risk and policy assessment documents to support its review of sulfur dioxide (SO2) national ambient air quality standards (NAAQS), reiterating earlier recommendations to leave the standards unchanged ahead of a looming deadline later this month for the agency to propose whether to revise the NAAQS. Under a court-mandated schedule, EPA must propose a new SO2 NAAQS rule by May 25, and a final rule by Jan. 18. In its final risk and exposure...