Air Quality Criteria for Carbon Monoxide (External Review Draft); Estimation of Carbon Monoxide Exposures and Associated Carboxyhemoglobin Levels in Denver Residents Using pNEM/CO (Version 2.0) (Draft)

ENVIRONMENTAL PROTECTION AGENCY

[NCEA-CD-99-1015; FRL-6310-4]

Air Quality Criteria for Carbon Monoxide (External Review Draft);

Estimation of Carbon Monoxide Exposures and Associated

Carboxyhemoglobin Levels in Denver Residents Using pNEM/CO (Version

2.0) (Draft)

AGENCY: Environmental Protection Agency.

ACTION: Notice of two drafts for public review and comment.

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SUMMARY: The U.S. Environmental Protection Agency (EPA), National

Center for Environmental Assessment, is announcing the availability of

an external review draft of the document, Air Quality Criteria for

Carbon Monoxide. Required under sections 108 and 109 of the Clean Air

Act, the purpose of this document is to provide an assessment of the

latest, relevant

[[Page 13199]]

scientific information that may have an impact on the next periodic

review of the National Ambient Air Quality Standards (NAAQS) for carbon

monoxide (CO).

The EPA's Office of Air Quality Planning and Standards (OAQPS) is

announcing the availability of a draft carbon monoxide exposure

analysis methodology report, Estimation of Carbon Monoxide Exposures

and Associated Carboxyhemoglobin Levels in Denver Residents Using pNEM/

CO (Version 2.0). This document is part of the technical support work

that will be summarized in the OAQPS staff paper on carbon monoxide.

DATES: Anyone who wishes to comment on the draft document, Air Quality

Criteria Document for Carbon Monoxide, may do so in writing by May 15,

1999. Send the written comments to the Project Manager for Carbon

Monoxide, National Center for Environmental Assessment-RTP Office (MD-

52), U.S. Environmental Protection Agency, Research Triangle Park, NC

27711.

The OAQPS draft report will be available by March 15, 1999. A

letter that will be included with copies of the draft will discuss the

length of time that OAQPS is allowing the public for comment and will

provide mailing information for the comments.

ADDRESSES: To obtain a copy of the Air Quality Criteria for Carbon

Monoxide (External Review Draft) 1999, EPA/600/P-99/001, contact the

National Service Center for Environmental Publications. Request a copy

by telephoning 1-800-490-9198 and provide the title and the EPA number

for the document. Internet users may obtain a copy from the EPA's

National Center for Environmental Assessment (NCEA's) home page. The

URL is http://www.epa.gov/ncea/.

To obtain a copy of the Estimation of Carbon Monoxide Exposures and

Associated Carboxyhemoglobin Levels in Denver Residents Using pNEM/CO

(Version 2.0), Internet users can go to the EPA's OAR Policy and

Guidance page on the OAQPS TTNWeb. The URL is http://www.epa.gov/ttn/

caa/t1sp.html. A limited number of paper copies of this document will

be available and can be obtained from: U.S. Environmental Protection

Agency Library, MD-35, Research Triangle Park, NC 27711, telephone

(919) 541-2777.

FOR FURTHER INFORMATION CONTACT: Mr. James Raub, National Center for

Environmental Assessment-RTP Office (MD-52), U.S. Environmental

Protection Agency, Research Triangle Park, NC 27711; telephone: 919-

541-4157; facsimile: 919-541-1818; E-mail: [email protected]. Mr. Raub

will provide information on the draft document, Air Quality Criteria

for Carbon Monoxide.

For further information related to the draft exposure analysis

methodology report for Denver, contact Mr. Harvey Richmond, Office of

Air Quality Planning and Standards (MD-15), U.S. Environmental

Protection Agency, Research Triangle Park, NC 27711; telephone: 919-

541-5271; facsimile: 919-541-0840; E-mail: [email protected].

SUPPLEMENTARY INFORMATION: The U.S. Environmental Protection Agency

(EPA) is updating and revising, where appropriate, the EPA's Air

Quality Criteria for Carbon Monoxide (CO). Sections 108 and 109 of the

Clean Air Act require that the EPA carry out a periodic review and

revision, where appropriate, of the criteria and the National Ambient

Air Quality Standards (NAAQS) for the ``criteria'' air pollutants such

as carbon monoxide.

After the completion of the comment period, the EPA will present

the external review draft of the Air Quality Criteria for Carbon

Monoxide and, as supporting documentation for the OAQPS staff paper on

carbon monoxide, the Estimation of Carbon Monoxide Exposures and

Associated Carboxyhemoglobin Levels in Denver Residents Using pNEM/CO

(Version 2.0) for review before the Clean Air Scientific Advisory

Committee (CASAC) later in 1999. The EPA will issue a subsequent

Federal Register document to inform the public of the exact date and

time of this meeting.

Dated: March 9, 1999.

William H. Farland,

Director, National Center for Environmental Assessment.

[FR Doc. 99-6508 Filed 3-16-99; 8:45 am]

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