Release of Draft Document Related to the Review of the National Ambient Air Quality Standards for Carbon Monoxide

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On or about October 20, 2009, the Office of Air Quality Planning and Standards (OAQPS) of EPA is making available for public comment a draft assessment document: Risk and Exposure Assessment to Support the Review of the Carbon Monoxide (CO) Primary National Ambient Air Quality Standards--First External Review Draft. This draft document describes the quantitative analyses that are being conducted as part of the review of the National Ambient Air Quality Standards (NAAQS) for carbon monoxide (CO).