Second External Review Draft Integrated Science Assessment for Sulfur Oxides-Health Criteria

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The Environmental Protection Agency (EPA) is announcing a public comment period ending on March 20, 2017, for the draft document titled, "Second External Review Draft Integrated Science Assessment for Sulfur Oxides--Health Criteria" (EPA/600/R-16/351). The draft document was prepared by the National Center for Environmental Assessment (NCEA) within EPA's Office of Research and Development (ORD) as part of the review of the primary (health-based) National Ambient Air Quality Standards (NAAQS) for sulfur dioxide (SO 2 ). The Integrated Science Assessment (ISA), in conjunction with additional technical and policy assessments, provides the scientific basis for EPA's decisions on the adequacy of the current NAAQS and the appropriateness of possible alternative standards. EPA intends to develop a separate ISA as part of an independent review for the secondary (welfare-based) NAAQS for oxides of nitrogen and sulfur. EPA is releasing this draft document to seek review by the Clean Air Scientific Advisory Committee (CASAC) and the public (meeting date and location to be specified in a separate Federal Register notice). This draft document is not final as described in EPA's information quali