The U.S. Environmental Protection Agency (EPA) is conducting a review of the air quality criteria and the national ambient air quality standards (NAAQS) for lead (Pb). The purpose of this document is to communicate the plan for this review. This review will provide an integrative assessment of relevant scientific information for Pb and will focus on the basic elements of the NAAQS for Pb: the indicator, averaging time, form, and level. These elements, which together serve to define each ambient air quality standard, must be considered collectively in evaluating the protection to public health and public welfare afforded by the standards. This draft Integrated Review Plan (IRP) contains the plans for this review of the air quality criteria for Pb-related effects on public health and public welfare and of the current Pb NAAQS. This draft IRP is being released for the purpose of consulting with the Clean Air Scientific Advisory Committee (CASAC) and obtaining public comment on the Agency's plans. The final IRP will be informed by comments received from the CASAC and the public.

Project officer: Deirdre Murphy. "March 2011." Draft--Do Not Quote or Cite. Includes bibliographical references. "EPA-452/D-11-001." "PB2011-109682."

The U.S. Environmental Protection Agency (EPA) is conducting a review of the air quality criteria and the National Ambient Air Quality Standards (NAAQS) for lead (Pb). The purpose of this document is to communicate the plan for this review. This review will provide an integrative assessment of relevant scientific information for Pb and will focus on the basic elements of the NAAQS for Pb: the indicator, averaging time, form, and level. These elements, which together serve to define each ambient air quality standard, must be considered collectively in evaluating the protection to public health and public welfare afforded by the standards. This draft Integrated Review Plan (IRP) contains the plans for this review of the air quality criteria for Pb-related effects on public health and public welfare and of the current Pb NAAQS. This draft IRP is being released for the purpose of consulting with the Clean Air Scientific Advisory Committee (CASAC) and obtaining public comment on the Agency's plans. The final IRP will be informed by comments received from the CASAC and the public. 1. Introduction -- 2. Review schedule -- 3. Key policy-relevent issues -- 4. Science assessment -- 5. Quantitative risk and exposure asssessment -- 6. Ambient air monitoring -- 7. Policy assessment and rulemaking -- 8. References -- Appendix A. Integrated science assessment for lead - Outline.