Daily Rules, Proposed Rules, and Notices of the Federal Government
EPA is releasing this draft document to seek review by the Clean Air Scientific Advisory Committee (CASAC) and the public (meeting date and location to be specified in a separate
Section 108 (a) of the Clean Air Act directs the Administrator to identify certain pollutants which, among other things, “cause or contribute to air pollution, which may reasonably be anticipated to endanger public health or welfare” and to issue air quality criteria for them. These air quality criteria are to “accurately reflect the latest scientific knowledge useful in indicating the kind and extent of all identifiable effects on public health or welfare, which may be expected from the presence of [a] pollutant in the ambient air * * *.” Under section 109 of the Act, EPA is then to establish national ambient air quality standards (NAAQS) for each pollutant for which EPA has issued criteria. Section 109 (d) of the Act subsequently requires periodic review and, if appropriate, revision of existing air quality criteria to reflect advances in scientific knowledge on the effects of the pollutant on public health or welfare. EPA is also to periodically review and, if appropriate, revise the NAAQS, based on the revised air quality criteria.
Pb is one of six principal (or “criteria”) pollutants for which EPA has established NAAQS. Periodically, EPA reviews the scientific basis for these standards by preparing an Integrated Science Assessment (ISA) (formerly called an Air Quality Criteria Document). The ISA provides a concise review, synthesis, and evaluation of the most policy-relevant science to serve as a scientific foundation for the review of the NAAQS. The CASAC, an independent science advisory committee mandated by Section 109 (d) (2) of the Clean Air Act, is charged with independent scientific review of EPA's air quality criteria.
On February 26, 2010 (75 FR 8934), EPA formally initiated its current review of the air quality criteria for Pb, requesting the submission of recent scientific information on specified topics. Soon after, a science policy workshop was held to identify key policy issues and questions to frame the review of the Pb NAAQS (75 FR 20843). Drawing from the workshop discussions, a draft of EPA's “Integrated Review Plan for the Lead National Ambient Air Quality Standards Review” (EPA/452/D-11-001) was developed and made available in March 2011 for public comment and was discussed by the CASAC via a publicly accessible teleconference consultation on May 5, 2011 (76 FR 21346). The final IRP was released in December 2011 (76 FR 76972) and is available at
As part of the science assessment phase of the review, EPA held a workshop in December 2010 to discuss, with invited scientific experts, initial draft materials prepared in the development of the ISA (75 FR 69078). The first external review draft ISA for Pb was released on May 6, 2011 (
Submit your comments, identified by Docket ID No. EPA-HQ-ORD-2011-0051 by one of the following methods:
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