Review of the Secondary National Ambient Air Quality Standards for Oxides of Nitrogen and Oxides of Sulfur

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On or about September 13, 2010, the Office of Air Quality Planning and Standards (OAQPS) of EPA is making available a draft report, Policy Assessment for the Review of the Secondary National Ambient Air Quality Standards for Oxides of Nitrogen and Oxides of Sulfur: Second External Review Draft. The EPA is releasing this preliminary draft document to seek early consultation with the Clean Air Scientific Advisory Committee (CASAC) and to solicit public comment on the overall structure, framing of key issues and conclusions regarding options for key elements of the standards.