# Identification of Ozone Areas for Which the 1-Hour Standard Has Been Revoked and Technical Correction to Phase 1 Rule
> **Rule** · Final rule. · Published 2005-08-03 · Effective 2005-09-02 · 70 FR 44470
## Document
- **Document number:** 05-15218
- **Category:** air-emissions
- **Federal Register citation:** 70 FR 44470
- **CFR reference:** 40 CFR 51
- **Publication date:** 2005-08-03
- **Effective date:** 2005-09-02
- **EPA docket:** FRL-7947-4
## Abstract

On April 30, 2004, EPA published the first phase of its final rule to implement the 8-Hour Ozone National Ambient Air Quality Standard (NAAQS) (Phase 1 Rule). At that same time, EPA also published 8-hour ozone designations for all areas of the country. For most areas, the 8-hour ozone designations became effective on June 15, 2004. The Phase 1 Rule provided that the 1-hour ozone NAAQS would no longer apply (i.e., would be revoked) for an area 1 year following the effective date of the area's designation for the 8-hour ozone NAAQS. This rule codifies the revocation of the 1-hour standard for those areas with effective 8-hour ozone designations. Because the Phase 1 Rule, as modified in a recent reconsideration rule, also provided that certain 1-hour nonattainment and maintenance obligations that applied as of the effective date of designation for the 8-hour NAAQS remain in place for an area, we are retaining the tables in 40 CFR part 81 that identify each area's 1-hour designation and classification status as of the effective date of the 8-hour designation for the area. The regulatory changes do not modify the tables for Early Action Compact areas for which the 1-hour NAAQS continues to apply. In addition, today's rule makes a technical correction to the last sentence in 40 CFR 51.905(c)(1) to reference 40 CFR part 81, subpart C as identifying the boundaries of areas and the area designations and classifications for the 1-hour ozone NAAQS that were in place as of the effective date of designation of the area for the 8-hour NAAQS. This rule eliminates the reservation of subpart E of part 81 for the above identification purpose.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/08/03/05-15218/identification-of-ozone-areas-for-which-the-1-hour-standard-has-been-revoked-and-technical)
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