Release of Risk and Exposure Assessment Planning Document for the Review of the National Ambient Air Quality Standards for Lead

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On June 28, 2011, the EPA made available for public review the Review of the National Ambient Air Quality Standards for Lead: Risk and Exposure Assessment Planning Document (REA Planning Document). This document considers the extent to which information and conclusions presented in the first external review draft of the Integrated Science Assessment (ISA) for this review (Lead Integrated Science Assessment (First External Review Draft) (First Draft ISA) provides support for the development of quantitative assessments of risk and exposure for health and/or welfare effects in this review of the national ambient air quality standards (NAAQS) for lead (Pb).