[Federal Register Volume 73, Number 236 (Monday, December 8, 2008)]
[Notices]
[Pages 74485-74486]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E8-28984]
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ENVIRONMENTAL PROTECTION AGENCY
[EPA-HQ-OAR-2006-0922; FRL-8748-5]
Final Risk and Exposure Assessment Report for Nitrogen Dioxide
(NO2)
AGENCY: Environmental Protection Agency (EPA).
ACTION: Notice of availability of final report.
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SUMMARY: On November 21, 2008, the Office of Air Quality Planning and
Standards (OAQPS) of EPA made available a final report titled, Risk and
Exposure Assessment to Support the Review of the NO2 Primary National
Ambient Air Quality Standard: Final Report. This final report has two
primary purposes. The first is to convey the approaches taken to
characterize human exposures and health risks associated with ambient
NO2 and to present the results of these analyses. The second
is to present a discussion of the NO2 scientific evidence
and the exposure- and risk-based information specifically as it relates
to the current and potential alternative NO2 standards.
FOR FURTHER INFORMATION CONTACT: Dr. Scott Jenkins, Office of Air
Quality Planning and Standards (Mail Code C504-06), U.S. Environmental
Protection Agency, Research Triangle Park, NC 27711; e-mail:
[email protected]; telephone: 919-541-1167; fax: 919-541-0237.
SUPPLEMENTARY INFORMATION:
General Information
A. How Can I Get Copies of This Document and Other Related Information
1. Docket. EPA has established a docket for this action under
Docket ID No. EPA-HQ-OAR-2006-0922. Publicly available docket materials
are available either electronically through http://www.regulations.gov
or in hard copy at the EPA Docket Center (EPA/DC), EPA West, Room 3334,
1301 Constitution Ave., NW., Washington, DC. The EPA Docket Center
Public
[[Page 74486]]
Reading Room is open from 8:30 a.m. to 4:30 p.m., Monday through
Friday, excluding legal holidays. The telephone number for the Public
Reading Room is (202) 566-1744, and the telephone number for the Office
of Air and Radiation Docket is (202) 566-1742.
2. Electronic Access. You may access this Federal Register document
electronically through the EPA Internet under the Federal Register
listings at http://www.epa.gov/fedrgstr/.
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
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
national ambient air quality standards (NAAQS) for each listed
pollutant, with the NAAQS based on the air quality criteria. 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.
Air quality criteria have been established for the nitrogen oxides
(NOX) and NAAQS have been established for nitrogen dioxide
(NO2), an indicator for gaseous NOX. Presently,
EPA is in the process of reviewing the NAAQS for NO2. As
part of its review of the NAAQS, EPA prepared an assessment of
exposures and health risks associated with ambient NO2. A
draft plan describing the proposed approaches to assessing exposures
and risks is described in the draft document, Nitrogen Dioxide Health
Assessment Plan: Scope and Methods for Exposure and Risk Assessment.
This document was released for public review and comment in September,
2007 and was the subject of a consultation with the Clean Air
Scientific Advisory Committee (CASAC) on October 24 and 25, 2007.
Comments received from that consultation were considered in developing
the document titled, Risk and Exposure Assessment to Support the Review
of the NO2 Primary National Ambient Air Quality Standard: First Draft,
which was released for public review and comment in April 2008. This
document was the subject of a CASAC review on May 1 and 2, 2008.
Comments received from that review were considered in developing the
document titled, Risk and Exposure Assessment to Support the Review of
the NO2 Primary National Ambient Air Quality Standard: Second Draft,
which was released for public review and comment in two parts, the
first in August, 2008 and the second in October, 2008. This document
was the subject of CASAC reviews on May 1 and 2, 2008 and on October
22, 2008. In preparing the final risk and exposure assessment report,
EPA has considered comments received from the CASAC and the public at
those meetings.
This final report has two primary purposes. The first is to convey
the approaches taken to characterize human exposures and health risks
associated with ambient NO2 and to present the results of these
analyses. The second is to present a discussion of the NO2 scientific
evidence and the exposure- and risk-based information specifically as
it relates to the current and potential alternative NO2 standards. This
final document is available online at: http://www.epa.gov/ttn/naaqs/standards/nox/s_nox_cr_rea.html.
Dated: December 1, 2008.
Mary E. Henigin,
Acting Director, Office of Air Quality Planning and Standards.
[FR Doc. E8-28984 Filed 12-5-08; 8:45 am]
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