Environmental Protection Agency (EPA).
Notice of Availability.
The Office of Air Quality Planning and Standards (OAQPS) of EPA is announcing the availability of a final document titled,
The REA will be available on or about May 28, 2010.
The document will be available primarily via the Internet at the following Web site:
For questions related to this document, please contact Dr. Deirdre Murphy, Office of Air Quality Planning and Standards (Mail code C504–06), U.S. Environmental Protection Agency, Research Triangle Park, NC 27711; e-mail:
Under section 108(a) of the Clean Air Act (CAA), the Administrator identifies and lists certain pollutants which “cause or contribute to air pollution which may reasonably be anticipated to endanger public health or welfare.” The EPA then issues air quality criteria for these listed pollutants, which are commonly referred to as “criteria pollutants.” The 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, in varying quantities.” Under section 109 of the CAA, EPA establishes primary (health-based) and secondary (welfare-based) NAAQS for pollutants for which air quality criteria are issued. Section 109(d) of the CAA requires periodic review and, if appropriate, revision of existing air quality criteria. The revised air quality criteria reflect advances in scientific knowledge on the effects of the pollutant on public health or welfare. The EPA is also required to periodically review and revise the NAAQS, if appropriate, based on the revised criteria.
Presently, EPA is reviewing the NAAQS for CO. The EPA's overall plan and schedule for this review is presented in the
As part of EPA's review of the primary (health-based) CO NAAQS, the Agency has conducted qualitative and quantitative assessments characterizing the health risks associated with exposure to ambient CO. The EPA's plans for conducting these assessments, including the proposed scope and methods of the analyses, were presented in a planning document titled,