# Approval and Promulgation of Air Quality Implementation Plans; Maine; Approval of State Implementation Plan Revision to PM10 PSD Increments
> **Rule** · Direct final rule. · Published 2004-03-22 · Effective 2004-05-21 · 69 FR 13227
## Document
- **Document number:** 04-6209
- **Category:** air-emissions
- **Federal Register citation:** 69 FR 13227
- **CFR reference:** 40 CFR 52
- **Publication date:** 2004-03-22
- **Effective date:** 2004-05-21
- **State:** ME
- **EPA docket:** R01-OAR-2004-ME-0001
## Abstract

EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Maine. This revision establishes maximum allowable increases in particulate matter concentration for the prevention of significant deterioration (PSD) program, where particulate matter is measured as particulates with a mean aerodynamic diameter of 10 microns or less ("PM10"), rather than as total suspended particulates (TSP).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/03/22/04-6209/approval-and-promulgation-of-air-quality-implementation-plans-maine-approval-of-state-implementation)
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