# Prevention of Significant Deterioration (PSD) and Non-Attainment New Source Review (NSR): Reconsideration
> **Rule** · Notice of final action on reconsideration; amendment to final rules. · Published 2003-11-07 · Effective 2004-01-06 · 68 FR 63021
## Document
- **Document number:** 03-28104
- **Category:** air-emissions
- **Federal Register citation:** 68 FR 63021
- **CFR reference:** 40 CFR 51
- **Publication date:** 2003-11-07
- **Effective date:** 2004-01-06
- **EPA docket:** FRL-7583-7, E-Docket ID No. A-2001-0004 (Legacy Docket ID No. A-90-37)
## Abstract

On December 31, 2002 and March 10, 2003, EPA revised regulations governing the major New Source Review (NSR) programs mandated by parts C and D of title I of the Clean Air Act (CAA or Act). Following these actions, the Administrator received a number of petitions for reconsideration. On July 30, 2003, EPA announced its reconsideration of certain issues arising from the final rules of December 31, 2002. We (the EPA) requested public comment on six issues for which we granted reconsideration. As a result of this reconsideration process, we have concluded that two clarifications to the underlying rules are warranted, which are: To include a definition of "replacement unit" and to clarify that the plantwide applicability limitation (PAL) baseline calculation procedures for newly constructed units do not apply to modified units. With respect to all other issues raised by the petitioners, we deny the requests for reconsideration.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/11/07/03-28104/prevention-of-significant-deterioration-psd-and-non-attainment-new-source-review-nsr-reconsideration)
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