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Under the Clean Air Act Amendments of 1977, EPA is required to review and if appropriate revise the air quality criteria and national ambient air quality standards (NAAQS) every five years. On June 22, 2010, EPA published a final rule to revise the primary (health-based) NAAQS for Sulfur Oxides to provide increased protection for public health. This review includes the preparation by EPA of an Integrated Review Plan, an Integrated Science Assessment, and, if warranted, a Risk/Exposure Assessment, and also a Policy Assessment Document, with opportunities for review by EPA's Clean Air Scientific Advisory Committee (CASAC) and the public. These documents will inform the Administrator's proposed decision as to whether to retain or revise the current standard. This proposed decision will be published in the Federal Register with opportunity provided for public comment. The Administrator's final decisions will take into consideration these documents, CASAC advice, and public comment on the proposed decision.