Draft Risk and Exposure Assessment Reports for Nitrogen Dioxide (NO2, 22363-22365 [E8-9132]

Download as PDF sroberts on PROD1PC70 with NOTICES Federal Register / Vol. 73, No. 81 / Friday, April 25, 2008 / Notices on December 18, 2006). After reviewing the results of those tests and other information submitted by the applicant in the application, EPA has determined, in accordance with Part 53, that this method should be designated as an equivalent method. The information submitted by the applicant in the application will be kept on file, either at EPA’s National Exposure Research Laboratory, Research Triangle Park, North Carolina 27711 or in an approved archive storage facility, and will be available for inspection (with advance notice) to the extent consistent with 40 CFR part 2 (EPA’s regulations implementing the Freedom of Information Act). As a designated equivalent method, this method is acceptable for use by states and other air monitoring agencies under the requirements of 40 CFR part 58, Ambient Air Quality Surveillance. For such purposes, the method must be used in strict accordance with the operation or instruction manual associated with the method and subject to any specifications and limitations (e.g., configuration or operational settings) specified in the applicable designation method description (see the identifications of the method above). Use of the method should also be in general accordance with the guidance and recommendations of applicable sections of the ‘‘Quality Assurance Handbook for Air Pollution Measurement Systems, Volume I,’’ EPA/ 600/R–94/038a and ‘‘Quality Assurance Handbook for Air Pollution Measurement Systems, Volume II, Part 1,’’ EPA–454/R–98–004 (available at https://www.epa.gov/ttn/amtic/ qabook.html). Vendor modifications of a designated equivalent method used for purposes of Part 58 are permitted only with prior approval of the EPA, as provided in Part 53. Provisions concerning modification of such methods by users are specified under Section 2.8 (Modifications of Methods by Users) of Appendix C to 40 CFR part 58. In general, a method designation applies to any sampler or analyzer which is identical to the sampler or analyzer described in the application for designation. In some cases, similar samplers or analyzers manufactured prior to the designation may be upgraded or converted (e.g., by minor modification or by substitution of the approved operation or instruction manual) so as to be identical to the designated method and thus achieve designated status. The manufacturer should be consulted to determine the feasibility of such upgrading or conversion. VerDate Aug<31>2005 20:20 Apr 24, 2008 Jkt 214001 Part 53 requires that sellers of designated reference or equivalent method analyzers or samplers comply with certain conditions. These conditions are specified in 40 CFR 53.9 and are summarized below: (a) A copy of the approved operation or instruction manual must accompany the sampler or analyzer when it is delivered to the ultimate purchaser. (b) The sampler or analyzer must not generate any unreasonable hazard to operators or to the environment. (c) The sampler or analyzer must function within the limits of the applicable performance specifications given in 40 CFR Parts 50 and 53 for at least one year after delivery when maintained and operated in accordance with the operation or instruction manual. (d) Any sampler or analyzer offered for sale as part of a reference or equivalent method must bear a label or sticker indicating that it has been designated as part of a reference or equivalent method in accordance with Part 53 and showing its designated method identification number. (e) If such an analyzer has two or more selectable ranges, the label or sticker must be placed in close proximity to the range selector and indicate which range or ranges have been included in the reference or equivalent method designation. (f) An applicant who offers samplers or analyzers for sale as part of a reference or equivalent method is required to maintain a list of ultimate purchasers of such samplers or analyzers and to notify them within 30 days if a reference or equivalent method designation applicable to the method has been canceled or if adjustment of the sampler or analyzer is necessary under 40 CFR 53.11(b) to avoid a cancellation. (g) An applicant who modifies a sampler or analyzer previously designated as part of a reference or equivalent method is not permitted to sell the sampler or analyzer (as modified) as part of a reference or equivalent method (although it may be sold without such representation), nor to attach a designation label or sticker to the sampler or analyzer (as modified) under the provisions described above, until the applicant has received notice under 40 CFR Part 53.14(c) that the original designation or a new designation applies to the method as modified, or until the applicant has applied for and received notice under 40 CFR 53.8(b) of a new reference or equivalent method determination for the sampler or analyzer as modified. PO 00000 Frm 00043 Fmt 4703 Sfmt 4703 22363 Aside from occasional breakdowns or malfunctions, consistent or repeated noncompliance with any of these conditions should be reported to: Director, Human Exposure and Atmospheric Sciences Division (MD– E205–01), National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711. Designation of this new equivalent method is intended to assist the States in establishing and operating their air quality surveillance systems under 40 CFR Part 58. Questions concerning the commercial availability or technical aspects of the method should be directed to the applicant. Jewel F. Morris, Acting Director, National Exposure Research Laboratory. [FR Doc. E8–9089 Filed 4–24–08; 8:45 am] BILLING CODE 6560–50–P ENVIRONMENTAL PROTECTION AGENCY [EPA–HQ–OAR–2006–0922; FRL–8558–8] Draft Risk and Exposure Assessment Reports for Nitrogen Dioxide (NO2) Environmental Protection Agency (EPA). ACTION: Notice of extension of comment period. AGENCY: SUMMARY: The EPA is announcing an extension of the public comment period on the Draft Risk and Exposure Assessment Reports for Nitrogen Dioxide (NO2) (73 FR 20045; April 14, 2008). The EPA is extending the comment period that originally ends on May 1, 2008. The extended comment period will close on May 30, 2008. The EPA is extending the comment period to provide stakeholders and the public with adequate time to conduct appropriate analysis and prepare meaningful comments. DATES: Comments on the above reports must be received on or before May 30, 2008. ADDRESSES: Submit your comments, identified by Docket ID No. EPA–HQ– OAR–2006–0922, by one of the following methods: • https://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. E:\FR\FM\25APN1.SGM 25APN1 sroberts on PROD1PC70 with NOTICES 22364 Federal Register / Vol. 73, No. 81 / Friday, April 25, 2008 / Notices • 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 https://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 https:// www.regulations.gov or e-mail. The https://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 https:// 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 https:// www.epa.gov/epahome/dockets.htm. Docket: All documents in the docket are listed in the https:// 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 VerDate Aug<31>2005 20:20 Apr 24, 2008 Jkt 214001 materials are available either electronically in https:// 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 https:// 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. PO 00000 Frm 00044 Fmt 4703 Sfmt 4703 • 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 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. E:\FR\FM\25APN1.SGM 25APN1 Federal Register / Vol. 73, No. 81 / Friday, April 25, 2008 / Notices These draft documents will be available online at: https://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 18, 2008. Stephen D. Page, Director, Office of Air Quality Planning and Standards. [FR Doc. E8–9132 Filed 4–24–08; 8:45 am] BILLING CODE 6560–50–P ENVIRONMENTAL PROTECTION AGENCY [ER–FRL–6698–2] sroberts on PROD1PC70 with NOTICES Environmental Impacts Statements; Notice of Availability Responsible Agency: Office of Federal Activities, General Information (202) 564–7167 or https://www.epa.gov/ compliance/nepa/. Weekly receipt of Environmental Impact Statements Filed 04/14/2008 Through 04/18/2008 Pursuant to 40 CFR 1506.9 EIS No. 20080147, Final EIS, AFS, MT Trapper Bunk House Land Stewardship Project, Reduce Risk from Stand-Replacing and Uncontrollable Fires, Improve Resiliency and Provide Forest Products, Fuel Reduction Research and Watershed Improvement, Bitterroot National Forest, Darby Ranger District, Ravalli County, MT, Wait Period Ends: 05/27/2008, Contact: Chuck Oliver 406–821–3913. EIS No. 20080148, Final EIS, SFW, WI Trempealeau National Wildlife Refuge Comprehensive Conservation Plan, Implementation, located within the Mississippi River Valley, Buffalo and Trempealeau Counties, WI, Wait Period Ends: 05/27/2008, Contact: Victoria Hirschboeck 608–539–2311. EIS No. 20080149, Final EIS, SFW, AZ Horseshoe and Bartlett Reservoirs Project, To Store and Release Water, Issuance of an Incidental Take Permit for Operation, Located Northeast of VerDate Aug<31>2005 20:20 Apr 24, 2008 Jkt 214001 Phoenix, Maricopa and Yavapai Counties, AZ, Wait Period Ends: 05/ 27/2008, Contact: Debra Bills 602– 242–0210. EIS No. 20080150, Draft EIS, NOA, 00 Amendment 16 to the Fishery Management Plan for the Snapper Grouper Fishery, To End Overfishing of Gag and Vermillion Snapper, Implementation, South Atlantic Region, Comment Period Ends: 06/09/ 2008, Contact: Dr. Roy E. Crabtree 727–824–5301. EIS No. 20080151, Second Final Supplement, AFS, CA Watdog Project, Additional Clarification of Changes Between the Final EIS (2005) and Final Supplement EIS (2007), Feather River Ranger District, Plumas National Forest, Butte and Plumas Counties, CA, Wait Period Ends: 05/ 27/2008, Contact: Carol Spinos 530– 534–6500. EIS No. 20080152, Final EIS, FRC, NC Yadkin—Yadkin-Pee Dee Hydro Electric Project (Docket Nos. P–2197– 073 & P–2206–030), Issuance of New Licenses for the Existing and Proposed Hydropower Projects, Yadkin—Yadkin-Pee Dee Rivers, Davidson, Davie, Montgomery, Rowan, Stanly, Anson and Richmond Counties, NC, Wait Period Ends: 05/ 27/2008, Contact: Stephen Bowler 202–502–6861. EIS No. 20080153, Draft Supplement, NOA, 00 Snapper Grouper Amendment 15B, Fishery Management Plan, Updated Information on the Economic Analysis for the Bag Limit Sales Provision, Update Management Reference Point for Golden Tilefish (Lopholatilus chamaeleonticeps); Define Allocations for Snowy Grouper (Epinephelus niveatus) and Red Porgy (Pagrus pagrus), NC, SC, FL, and GA, Comment Period Ends: 06/09/2008, Contact: Dr. Roy E. Crabtree 727–824– 5305. EIS No. 20080154, Draft EIS, FHW, MD US 50 Crossing Study, Transportation Improvement from MD–611 to MD 378; and 3rd Street to Somerset Street, Funding, U.S. Coast Guard, U.S. Army COE Section 10 and 404 Permits, Worcester County, MD, Comment Period Ends: 06/30/2008, Contact: Denise King 410–779–7145. Amended Notices EIS No. 20080072, Draft EIS, IBR, CO Southern Delivery System Project, Water Supply Development, Execution of up to 40-year Contracts for Use of Fryingpan-Arkansas Project Facilities, Special Use Permit, El Paso County, CO, Comment Period Ends: PO 00000 Frm 00045 Fmt 4703 Sfmt 4703 22365 04/29/2008, Contact: Kara Lamb 970– 663–3212. Revision of FR Notice Published 02/ 29/2008: Extending Comment Period from 04/29/2008 to 06/13/2008. Dated: April 22, 2008. Robert W. Hargrove, Director, NEPA Compliance Division, Office of Federal Activities. [FR Doc. E8–9075 Filed 4–24–08; 8:45 am] BILLING CODE 6560–50–P ENVIRONMENTAL PROTECTION AGENCY [ER-FRL–6698–3] Environmental Impact Statements and Regulations; Availability of EPA Comments Availability of EPA comments prepared pursuant to the Environmental Review Process (ERP), under section 309 of the Clean Air Act and Section 102(2)(c) of the National Environmental Policy Act as amended. Requests for copies of EPA comments can be directed to the Office of Federal Activities at 202–564–7167. An explanation of the ratings assigned to draft environmental impact statements (EISs) was published in FR dated April 11, 2008 (73 FR 19833). Draft EISs EIS No. 20080004, ERP No. D–NSA– A06182–00 PROGRAMMATIC—EIS— Complex Transformation, To Make the U.S. Nuclear Weapon Complex Smaller, and more Responsive, Efficient and Secure in Order to Meet National Security Requirements, CA, NV, NM, SC, TN and TX Summary: EPA does not object to the proposed action. Rating LO. EIS No. 20080035, ERP No. D–IBR– L39041–WA Yakima River Basin Water Storage Feasibility Study, Create Additional Water Storage, Benton, Yakima, Kittitas Counties, WA Summary: EPA expressed environmental objections to the proposed Black Rock Alternative because of potential impacts to groundwater, and subsequent migration of radiological and chemical contaminants to the Columbia River, and a lack of effective mitigation measures. EPA’s concerns about the Wymer Dam and Reservoir and Wymer Dam Plus Yakima River Pump Exchange alternatives were the potential adverse effects on wetlands, riparian areas, water quality, and habitat. EPA recommended additional evaluation of E:\FR\FM\25APN1.SGM 25APN1

Agencies

[Federal Register Volume 73, Number 81 (Friday, April 25, 2008)]
[Notices]
[Pages 22363-22365]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-9132]


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

ENVIRONMENTAL PROTECTION AGENCY

[EPA-HQ-OAR-2006-0922; FRL-8558-8]


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

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice of extension of comment period.

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

SUMMARY: The EPA is announcing an extension of the public comment 
period on the Draft Risk and Exposure Assessment Reports for Nitrogen 
Dioxide (NO2) (73 FR 20045; April 14, 2008). The EPA is extending the 
comment period that originally ends on May 1, 2008. The extended 
comment period will close on May 30, 2008. The EPA is extending the 
comment period to provide stakeholders and the public with adequate 
time to conduct appropriate analysis and prepare meaningful comments.

DATES: Comments on the above reports must be received on or before May 
30, 2008.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-HQ-
OAR-2006-0922, by one of the following methods:
     https://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.

[[Page 22364]]

     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 https://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 https://
www.regulations.gov or e-mail. The https://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 https://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 https://www.epa.gov/
epahome/dockets.htm.
    Docket: All documents in the docket are listed in the https://
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 https://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 
https://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 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.

[[Page 22365]]

These draft documents will be available online at: https://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 18, 2008.
Stephen D. Page,
Director, Office of Air Quality Planning and Standards.
 [FR Doc. E8-9132 Filed 4-24-08; 8:45 am]
BILLING CODE 6560-50-P
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