Ozone Design Value Study of the Clean Air Act Amendments of 1990

ENVIRONMENTAL PROTECTION AGENCY

[FRL-4879-3]

Ozone Design Value Study of the Clean Air Act Amendments of 1990

AGENCY: Environmental Protection Agency (EPA).

ACTION: Extension of comment period for draft report on the ``Clean Air

Act Ozone Design Value Study''.

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SUMMARY: Section 183(g) of title I of the Clean Air Act Amendments of

1990 requires the Administrator to conduct a study of whether the

methodology in use by the EPA, as of the date of enactment, for

establishing a design value for ozone, provides a reasonable indicator

of the ozone air quality of ozone nonattainment areas. The EPA is

directed to obtain public review of the study report prior to

submitting the report to Congress.

The focus of the Ozone Design Value Study is EPA's ozone design

value methodology. A design value may be viewed intuitively as a

concentration value used to quantify the degree to which the level of

an air quality standard has been exceeded. With the wording of the

ozone standard, the appropriate design value is the concentration with

expected number of exceedances equal to 1. These ozone design values

were used to classify areas as marginal, moderate, serious, severe, or

extreme in accordance with the provisions of the Clean Air Act

Amendments of 1990.

This notice extends the period for public review and comment of the

draft report of the ``Clean Air Act Ozone Design Value Study'' from 30

days to 60 days.

DATES: Comments must be received by May 31, 1994.

Availability of Draft Report

Single copies of the report are available from the U.S. EPA Library

(MD-35), Research Triangle Park, North Carolina 27711, telephone number

(919) 541-2777. Please refer to ``The Clean Air Act Ozone Design Value

Study.''

ADDRESSES: Written comments should be submitted to Mr. Warren P. Freas,

U.S. Environmental Protection Agency, Data Analysis Section, Monitoring

and Reports Branch, Technical Support Division MD-14, Research Triangle

Park, North Carolina, 27711.

FOR FURTHER INFORMATION CONTACT:

Mr. Warren P. Freas at (919) 541-5469, Data Analysis Section.

Monitoring and Reports Branch (MD-14), U.S. Environmental Protection

Agency, Research Triangle Park, North Carolina 27711.

Dated: April 19, 1994.

Mary D. Nichols,

Assistant Administrator, for Air and Radiation.

[FR Doc. 94-10142 Filed 4-26-94; 8:45 am]

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