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Under the Clean Air Act, as amended, the EPA is required to review and if appropriate revise the air quality criteria and national ambient air quality standards (NAAQS) every five years. On February 9, 2010, the EPA published a final rule revising the primary (health-based) NO2 NAAQS to provide increased protection for public health. This review includes the preparation of an Integrated Review Plan, an Integrated Science Assessment, and, if warranted, a Risk/Exposure Assessment, and also a Policy Assessment by the EPA, with opportunities for review by the EPA's Clean Air Scientific Advisory Committee and the public. These documents will inform the Administrator's decision as to whether to retain or revise the current standards. The proposed decision was published in the Federal Register with opportunity for public comment. The Administrator's final decisions will take into consideration these documents, CASAC advice, and public comment on the proposed decision.