Draft Risk and Exposure Assessment Reports for Nitrogen Dioxide (NO2, 20045-20047 [E8-7882]

Download as PDF jlentini on PROD1PC65 with NOTICES Federal Register / Vol. 73, No. 72 / Monday, April 14, 2008 / Notices submitted electronically or in paper, will be made available for public viewing at http://www.regulations.gov, as EPA receives them and without change, unless the comment contains copyrighted material, Confidential Business Information (CBI), or other information whose public disclosure is restricted by statute. For further information about the electronic docket, go to http://www.regulations.gov. Title: NESHAP for Engine Test Cells/ Stands (Renewal). ICR Numbers: EPA ICR Number 2066.04, OMB Control Number 2060– 0483. ICR Status: This ICR is scheduled to expire on July 31, 2008. Under OMB regulations, the Agency may continue to conduct or sponsor the collection of information while this submission is pending at OMB. An Agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid OMB control number. The OMB control numbers for EPA’s regulations in title 40 of the CFR, after appearing in the Federal Register when approved, are listed in 40 CFR part 9, and displayed either by publication in the Federal Register or by other appropriate means, such as on the related collection instrument or form, if applicable. The display of OMB control numbers in certain EPA regulations is consolidated in 40 CFR part 9. Abstract: The National Emission Standards for Hazardous Air Pollutants (NESHAP), for Engine Test Cells/Stands were proposed on May 14, 2002 (67 FR 34547), and promulgated on May 27, 2003 (68 FR 28785). These standards apply to any existing, reconstructed, or new affected sources. An affected source is the collection of all equipment and activities associated with engine test cells/stands used for testing uninstalled stationary or uninstalled mobile engines. Respondents of affected sources are subject to the requirements of 40 CFR part 63, subpart A, the General Provisions, unless the regulation specifies otherwise. Owners and operators must submit an initial notification report upon the construction, or reconstruction of any engine test cells/stands used for testing internal combustion engines. The respondents are required to submit a semiannual compliance report. If there were no deviations from the emission limitation and the continuous emission monitoring system (CEMS) was operating correctly, the semiannual report must contain a statement that no deviation occurred. If a deviation occurred from an emission limit, the report must contain detailed VerDate Aug<31>2005 18:09 Apr 11, 2008 Jkt 214001 information of the nature of the deviation. Performance test reports are the Agency’s records of a source’s initial capability to comply with the emission standards, and serve as a record of the operating conditions under which compliance is to be achieved. The information generated by monitoring, recordkeeping and reporting requirements described in this ICR are used by the Agency to ensure that facilities affected by the standard continue to operate the control equipment and achieve continuous compliance with the regulation. Owners or operators of engine test cells/stands facilities subject to the rule must maintain a file of these measurements, and retain the file for at least five years following the date of such measurements, maintenance reports, and records. All reports are sent to the delegated state or local authority. In the event that there is no such delegated authority, the reports are sent directly to the EPA regional office. This information is being collected to assure compliance with 40 CFR part 63, subpart PPPPP, as authorized in section 112 and 114(a) of the Clean Air Act. The required information consists of emissions data and other information that have been determined to be private. An Agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid OMB Control Number. The OMB Control Number for EPA’s regulations are listed in 40 CFR part 9 and 48 CFR chapter 15, and are identified on the form and/or instrument, if applicable. Burden Statement: The annual public reporting and recordkeeping burden for this collection of information is estimated to average 76 hours per response. Burden means the total time, effort, or financial resources expended by persons to generate, maintain, retain, or disclose or provide information to or for a Federal agency. This includes the time needed to review instructions; develop, acquire, install, and utilize technology and systems for the purposes of collecting, validating, and verifying information, processing and maintaining information, and disclosing and providing information; adjust the existing ways to comply with any previously applicable instructions and requirements which have subsequently changed; train personnel to be able to respond to a collection of information; search data sources; complete and review the collection of information; and transmit or otherwise disclose the information. Respondents/Affected Entities: Engine test cells/stands. PO 00000 Frm 00028 Fmt 4703 Sfmt 4703 20045 Estimated Number of Respondents: 18. Frequency of Response: Semiannually, annually, and initially. Estimated Total Annual Hour Burden: 3,043. Estimated Total Annual Cost: $248,264. Including $5,400 in O&M costs, no annualized capital costs, and $242,864 in labor costs. Changes in the Estimates: There is no change in the labor hours or cost in this ICR compared to the previous ICR; however, a rounding error was corrected in the Annual Cost. There are no changes due to two considerations. First, the regulations have not changed over the past three years and are not anticipated to change over the next three years. Secondly, the growth rate for the industry is very low, negative or non-existent, so there is no significant change in the overall burden. Since there are no changes in the regulatory requirements and there is no significant industry growth, the labor hours and cost figures in the previous ICR are used in this ICR, and there is no change in burden to industry. Dated: April 8, 2008. Sara Hisel-McCoy, Director, Collection Strategies Division. [FR Doc. E8–7878 Filed 4–11–08; 8:45 am] BILLING CODE 6560–50–P ENVIRONMENTAL PROTECTION AGENCY [EPA–HQ–OAR–2006–0922; FRL–8553–6] Draft Risk and Exposure Assessment Reports for Nitrogen Dioxide (NO2) Environmental Protection Agency (EPA). ACTION: Notice of draft reports for public review and comment. AGENCY: SUMMARY: On April 4, 2008, the Office of Air Quality Planning and Standards (OAQPS) of EPA is making available for public review and comment two draft documents. The first document is titled ‘‘Risk and Exposure Assessment to Support the Review of the NO2 Primary National Ambient Air Quality Standard: First Draft.’’ The title of the second document is ‘‘Risk and Exposure Assessment to Support the Review of the NO2 Primary National Ambient Air Quality Standard: Draft Technical Support Document (TSD).’’ The purpose of these draft documents is to convey the approach taken to assess exposures to ambient NO2 and to characterize associated health risks, as well as to present the results of those assessments. E:\FR\FM\14APN1.SGM 14APN1 20046 Federal Register / Vol. 73, No. 72 / Monday, April 14, 2008 / Notices Comments on the above reports must be received on or before May 1, 2008. DATES: Submit your comments, identified by Docket ID No. EPA–HQ– OAR–2006–0922, by one of the following methods: • http://www.regulations.gov: Follow the on-line instructions for submitting comments. • E-mail: Comments may be sent by electronic mail (e-mail) to a-and-rdocket@epa.gov, Attention Docket ID No. EPA–HQ–OAR–2006–0922. • Fax: Fax your comments to 202– 566–9744, Attention Docket ID. No. EPA–HQ–OAR–2006–0922. • Mail: Send your comments to: Air and Radiation Docket and Information Center, Environmental Protection Agency, Mailcode: 2822T, 1200 Pennsylvania Ave., NW., Washington, DC 20460, Attention Docket ID No. EPA–HQ–OAR–2006–0922. • Hand Delivery or Courier: Deliver your comments to: EPA Docket Center, 1301 Constitution Ave., NW., Room 3334, Washington, DC. Such deliveries are only accepted during the Docket’s normal hours of operation, and special arrangements should be made for deliveries of boxed information. Instructions: Direct your comments to Docket ID No. EPA–HQ–OAR–2006– 0922. The EPA’s policy is that all comments received will be included in the public docket without change and may be made available online at http://www.regulations.gov, including any personal information provided, unless the comment includes information claimed to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Do not submit information that you consider to be CBI or otherwise protected through http:// www.regulations.gov or e-mail. The http://www.regulations.gov Web site is an ‘‘anonymous access’’ system, which means EPA will not know your identity or contact information unless you provide it in the body of your comment. If you send an e-mail comment directly to EPA without going through http:// www.regulations.gov your e-mail address will be automatically captured and included as part of the comment that is placed in the public docket and made available on the Internet. If you submit an electronic comment, EPA recommends that you include your name and other contact information in the body of your comment and with any disk or CD–ROM you submit. If EPA cannot read your comment due to technical difficulties and cannot contact you for clarification, EPA may not be jlentini on PROD1PC65 with NOTICES ADDRESSES: VerDate Aug<31>2005 18:09 Apr 11, 2008 Jkt 214001 able to consider your comment. Electronic files should avoid the use of special characters, any form of encryption, and be free of any defects or viruses. For additional information about EPA’s public docket visit the EPA Docket Center homepage at http:// www.epa.gov/epahome/dockets.htm. Docket: All documents in the docket are listed in the http:// www.regulations.gov index. Although listed in the index, some information is not publicly available, e.g., CBI or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, will be publicly available only in hard copy. Publicly available docket materials are available either electronically in http:// www.regulations.gov or in hard copy at the Air Docket in the EPA Docket Center, EPA West, Room 3334, 1301 Constitution Ave., NW., Washington, DC. This Docket Facility is open from 8:30 a.m. to 4:30 p.m. Monday through Friday, excluding legal holidays. The Docket telephone number is 202–566– 1742; fax 202–566–9744. FOR FURTHER INFORMATION CONTACT: Dr. Scott Jenkins, Office of Air Quality Planning and Standards (Mailcode C504–06), U.S. Environmental Protection Agency, Research Triangle Park, NC 27711; e-mail: Jenkins.scott@epa.gov; telephone: 919– 541–1167; fax: 919–541–0237. General Information A. What Should I Consider as I Prepare My Comments for EPA? 1. Submitting CBI. Do not submit this information to EPA through http:// www.regulations.gov or e-mail. Clearly mark the part or all of the information that you claim to be CBI. For CBI information in a disk or CD–ROM that you mail to EPA, mark the outside of the disk or CD–ROM as CBI and then identify electronically within the disk or CD–ROM the specific information that is claimed as CBI. In addition to one complete version of the comment that includes information claimed as CBI, a copy of the comment that does not contain the information claimed as CBI must be submitted for inclusion in the public docket. Information so marked will not be disclosed except in accordance with procedures set forth in 40 CFR part 2. 2. Tips for Preparing Your Comments. When submitting comments, remember to: • Identify the rulemaking by docket number and other identifying information (subject heading, Federal Register date and page number). PO 00000 Frm 00029 Fmt 4703 Sfmt 4703 • Follow directions—The agency may ask you to respond to specific questions or organize comments by referencing a Code of Federal Regulations (CFR) part or section number. • Explain why you agree or disagree; suggest alternatives and substitute language for your requested changes. • Describe any assumptions and provide any technical information and/or data that you used. • If you estimate potential costs or burdens, explain how you arrived at your estimate in sufficient detail to allow for it to be reproduced. • Provide specific examples to illustrate your concerns, and suggest alternatives. • Explain your views as clearly as possible, avoiding the use of profanity or personal threats. • Make sure to submit your comments by the comment period deadline identified. SUPPLEMENTARY INFORMATION: 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 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 NOX. Presently, EPA is reviewing the air quality criteria for NOX and the NAAQS for NO2. As part of its review of the NAAQS, EPA is preparing 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 E:\FR\FM\14APN1.SGM 14APN1 Federal Register / Vol. 73, No. 72 / Monday, April 14, 2008 / Notices 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 have been considered in developing the draft risk and exposure assessment documents being released at this time. The draft documents convey the approach taken to assess exposures to ambient NO2 and to characterize associated health risks, as well as to present the results of those assessments. These draft documents will be available online at: http://www.epa.gov/ttn/ naaqs/standards/nox/ s_nox_cr_rea.html. The EPA is soliciting advice and recommendations from the CASAC by means of a review on the draft documents at an upcoming public meeting of the CASAC. A Federal Register notice will inform the public of the date and location of that meeting. Following the CASAC meeting, EPA will consider comments received from the CASAC and the public in preparing a second draft risk and exposure assessment report. The release of the second draft report will be followed by another CASAC meeting and ultimately by a final risk and exposure assessment report. Dated: April 4, 2008. Mary E. Henigin, Acting Director, Office of Air Quality Planning and Standards. [FR Doc. E8–7882 Filed 4–11–08; 8:45 am] BILLING CODE 6560–50–P ENVIRONMENTAL PROTECTION AGENCY [FRL–8553–5] Application of Watershed Ecological Risk Assessment Methods to Watershed Management Environmental Protection Agency (EPA). ACTION: Notice of availability. jlentini on PROD1PC65 with NOTICES AGENCY: SUMMARY: EPA is announcing the availability of a final report titled, ‘‘Application of Watershed Ecological Risk Assessment Methods to Watershed Management’’ (EPA/600/R–06/037F), which was prepared by the National Center for Environmental Assessment (NCEA) within EPA’s Office of Research and Development (ORD). VerDate Aug<31>2005 18:09 Apr 11, 2008 Jkt 214001 This document will be available on or about April 14, 2008. ADDRESSES: The document will be available electronically through the NCEA Web site at http://www.epa.gov/ ncea. A limited number of paper copies will be available from the EPA’s National Service Center for Environmental Publications (NSCEP), P.O. Box 42419, Cincinnati, OH 45242; telephone: 1–800–490–9198; facsimile: 301–604–3408; e-mail: nscep@bpslmit.com. Please provide your name, your mailing address, the title and the EPA number of the requested publication. DATES: The Information Management Team, National Center for Environmental Assessment (8601P), U.S. Environmental Protection Agency, 1200 Pennsylvania Avenue, NW., Washington, DC 20460. Telephone: 703–347–8561; fax: 703–347–8691; email: nceadc.comment@epa.gov. SUPPLEMENTARY INFORMATION: Ecological risk assessment (ERA) is a process for analyzing environmental problems and is intended to increase the use of ecological science in decision making in order to evaluate the likelihood that adverse ecological effects may occur or are occurring as a result of exposure to one or more stressors. Applying ERA principles to watershed management makes scientific information more relevant to the needs of environmental managers. Watershed ERAs are complex because addressing impacts from multiple sources and stressors on multiple endpoints presents a scientific challenge and because multiple stakeholders have diverse interests. The needs of managers and stakeholders may change, and the need to take action may require using the best available information at the time, sometimes before an ERA is completed. Therefore, some flexibility of ERA methods is needed when performing watershed ERAs. It is also important that risk assessors and managers interact regularly and repeatedly. This report supplements the Guidelines for Ecological Risk Assessment (U.S. EPA, 1998a) by addressing issues unique to ecological assessments of watersheds. Using lessons learned from watershed ERAs, the report presents guidance and examples for scientists performing watershed ecological assessments. The report also can be useful to risk assessors, watershed associations, landscape ecologists, and others seeking to increase the use of environmental assessment data in decision making. FOR FURTHER INFORMATION CONTACT: PO 00000 Frm 00030 Fmt 4703 Sfmt 4703 20047 Each activity and phase of the watershed ERA process is explained sequentially in this report. Guidance on how to involve stakeholders to generate environmental management goals and objectives is provided. The processes for selecting assessment endpoints, developing conceptual models, and selecting the exposure and effects pathways to be analyzed are described. Suggestions for predicting how multiple sources and stressors affect assessment endpoints are also provided; these include using multivariate analyses to compare land use with biotic measurements. In addition, the report suggests how to estimate, describe, and communicate risk and how to evaluate management alternatives. Dated: April 3, 2008. Rebecca Clark, Deputy Director, National Center for Environmental Assessment. [FR Doc. E8–7774 Filed 4–11–08; 8:45 am] BILLING CODE 6560–50–P FEDERAL COMMUNICATIONS COMMISSION Notice of Public Information Collection(s) Being Reviewed by the Federal Communications Commission for Extension Under Delegated Authority, Comments Requested April 7, 2008. SUMMARY: The Federal Communications Commission, as part of its continuing effort to reduce paperwork burden invites the general public and other Federal agencies to take this opportunity to comment on the following information collection(s), as required by the Paperwork Reduction Act of 1995, 44 U.S.C. 3501–3520. An agency may not conduct or sponsor a collection of information unless it displays a currently valid control number. No person shall be subject to any penalty for failing to comply with a collection of information subject to the Paperwork Reduction Act (PRA) that does not display a valid control number. Comments are requested concerning (a) whether the proposed collection of information is necessary for the proper performance of the functions of the Commission, including whether the information shall have practical utility; (b) the accuracy of the Commission’s burden estimate; (c) ways to enhance the quality, utility, and clarity of the information collected; and (d) ways to minimize the burden of the collection of information on the respondents, including the use of automated E:\FR\FM\14APN1.SGM 14APN1

Agencies

[Federal Register Volume 73, Number 72 (Monday, April 14, 2008)]
[Notices]
[Pages 20045-20047]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-7882]


-----------------------------------------------------------------------

ENVIRONMENTAL PROTECTION AGENCY

[EPA-HQ-OAR-2006-0922; FRL-8553-6]


Draft Risk and Exposure Assessment Reports for Nitrogen Dioxide 
(NO2)

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice of draft reports for public review and comment.

-----------------------------------------------------------------------

SUMMARY: On April 4, 2008, the Office of Air Quality Planning and 
Standards (OAQPS) of EPA is making available for public review and 
comment two draft documents. The first document is titled ``Risk and 
Exposure Assessment to Support the Review of the NO2 Primary 
National Ambient Air Quality Standard: First Draft.'' The title of the 
second document is ``Risk and Exposure Assessment to Support the Review 
of the NO2 Primary National Ambient Air Quality Standard: 
Draft Technical Support Document (TSD).'' The purpose of these draft 
documents is to convey the approach taken to assess exposures to 
ambient NO2 and to characterize associated health risks, as 
well as to present the results of those assessments.

[[Page 20046]]


DATES: Comments on the above reports must be received on or before May 
1, 2008.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-HQ-
OAR-2006-0922, by one of the following methods:
     http://www.regulations.gov: Follow the on-line 
instructions for submitting comments.
     E-mail: Comments may be sent by electronic mail (e-mail) 
to a-and-r-docket@epa.gov, Attention Docket ID No. EPA-HQ-OAR-2006-
0922.
     Fax: Fax your comments to 202-566-9744, Attention Docket 
ID. No. EPA-HQ-OAR-2006-0922.
     Mail: Send your comments to: Air and Radiation Docket and 
Information Center, Environmental Protection Agency, Mailcode: 2822T, 
1200 Pennsylvania Ave., NW., Washington, DC 20460, Attention Docket ID 
No. EPA-HQ-OAR-2006-0922.
     Hand Delivery or Courier: Deliver your comments to: EPA 
Docket Center, 1301 Constitution Ave., NW., Room 3334, Washington, DC. 
Such deliveries are only accepted during the Docket's normal hours of 
operation, and special arrangements should be made for deliveries of 
boxed information.
    Instructions: Direct your comments to Docket ID No. EPA-HQ-OAR-
2006-0922. The EPA's policy is that all comments received will be 
included in the public docket without change and may be made available 
online at http://www.regulations.gov, including any personal 
information provided, unless the comment includes information claimed 
to be Confidential Business Information (CBI) or other information 
whose disclosure is restricted by statute. Do not submit information 
that you consider to be CBI or otherwise protected through http://
www.regulations.gov or e-mail. The http://www.regulations.gov Web site 
is an ``anonymous access'' system, which means EPA will not know your 
identity or contact information unless you provide it in the body of 
your comment. If you send an e-mail comment directly to EPA without 
going through http://www.regulations.gov your e-mail address will be 
automatically captured and included as part of the comment that is 
placed in the public docket and made available on the Internet. If you 
submit an electronic comment, EPA recommends that you include your name 
and other contact information in the body of your comment and with any 
disk or CD-ROM you submit. If EPA cannot read your comment due to 
technical difficulties and cannot contact you for clarification, EPA 
may not be able to consider your comment. Electronic files should avoid 
the use of special characters, any form of encryption, and be free of 
any defects or viruses. For additional information about EPA's public 
docket visit the EPA Docket Center homepage at http://www.epa.gov/
epahome/dockets.htm.
    Docket: All documents in the docket are listed in the http://
www.regulations.gov index. Although listed in the index, some 
information is not publicly available, e.g., CBI or other information 
whose disclosure is restricted by statute. Certain other material, such 
as copyrighted material, will be publicly available only in hard copy. 
Publicly available docket materials are available either electronically 
in http://www.regulations.gov or in hard copy at the Air Docket in the 
EPA Docket Center, EPA West, Room 3334, 1301 Constitution Ave., NW., 
Washington, DC. This Docket Facility is open from 8:30 a.m. to 4:30 
p.m. Monday through Friday, excluding legal holidays. The Docket 
telephone number is 202-566-1742; fax 202-566-9744.

FOR FURTHER INFORMATION CONTACT: Dr. Scott Jenkins, Office of Air 
Quality Planning and Standards (Mailcode C504-06), U.S. Environmental 
Protection Agency, Research Triangle Park, NC 27711; e-mail: 
Jenkins.scott@epa.gov; telephone: 919-541-1167; fax: 919-541-0237.

General Information

A. What Should I Consider as I Prepare My Comments for EPA?

    1. Submitting CBI. Do not submit this information to EPA through 
http://www.regulations.gov or e-mail. Clearly mark the part or all of 
the information that you claim to be CBI. For CBI information in a disk 
or CD-ROM that you mail to EPA, mark the outside of the disk or CD-ROM 
as CBI and then identify electronically within the disk or CD-ROM the 
specific information that is claimed as CBI. In addition to one 
complete version of the comment that includes information claimed as 
CBI, a copy of the comment that does not contain the information 
claimed as CBI must be submitted for inclusion in the public docket. 
Information so marked will not be disclosed except in accordance with 
procedures set forth in 40 CFR part 2.
    2. Tips for Preparing Your Comments. When submitting comments, 
remember to:
     Identify the rulemaking by docket number and other 
identifying information (subject heading, Federal Register date and 
page number).
     Follow directions--The agency may ask you to respond to 
specific questions or organize comments by referencing a Code of 
Federal Regulations (CFR) part or section number.
     Explain why you agree or disagree; suggest alternatives 
and substitute language for your requested changes.
     Describe any assumptions and provide any technical 
information and/or data that you used.
     If you estimate potential costs or burdens, explain how 
you arrived at your estimate in sufficient detail to allow for it to be 
reproduced.
     Provide specific examples to illustrate your concerns, and 
suggest alternatives.
     Explain your views as clearly as possible, avoiding the 
use of profanity or personal threats.
     Make sure to submit your comments by the comment period 
deadline identified.

SUPPLEMENTARY INFORMATION: 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 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 NOX. Presently, EPA is 
reviewing the air quality criteria for NOX and the NAAQS for 
NO2. As part of its review of the NAAQS, EPA is preparing 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

[[Page 20047]]

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 
have been considered in developing the draft risk and exposure 
assessment documents being released at this time.
    The draft documents convey the approach taken to assess exposures 
to ambient NO2 and to characterize associated health risks, 
as well as to present the results of those assessments. These draft 
documents will be available online at: http://www.epa.gov/ttn/naaqs/
standards/nox/s_nox_cr_rea.html.
    The EPA is soliciting advice and recommendations from the CASAC by 
means of a review on the draft documents at an upcoming public meeting 
of the CASAC. A Federal Register notice will inform the public of the 
date and location of that meeting. Following the CASAC meeting, EPA 
will consider comments received from the CASAC and the public in 
preparing a second draft risk and exposure assessment report. The 
release of the second draft report will be followed by another CASAC 
meeting and ultimately by a final risk and exposure assessment report.

    Dated: April 4, 2008.
Mary E. Henigin,
Acting Director, Office of Air Quality Planning and Standards.
 [FR Doc. E8-7882 Filed 4-11-08; 8:45 am]
BILLING CODE 6560-50-P