# Approval and Promulgation of Air Quality Implementation Plans; Maryland; PM-10 Test Methods
> **Rule** · Direct final rule. · Published 2007-01-03 · Effective 2007-03-05 · 72 FR 18
## Document
- **Document number:** E6-22414
- **Category:** air-emissions
- **Federal Register citation:** 72 FR 18
- **CFR reference:** 40 CFR 52
- **Publication date:** 2007-01-03
- **Effective date:** 2007-03-05
- **State:** MD
- **EPA docket:** EPA-R03-OAR-2006-0904
## Abstract

EPA is taking direct final action to approve revisions to the Maryland State Implementation Plan (SIP). The revisions incorporate by reference EPA's test methods for particulate matter with a particle size of 10 microns or less (PM-10). EPA is approving these revisions to the General Administrative Provisions of the Maryland regulations in accordance with the requirements of the Clean Air Act.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/01/03/E6-22414/approval-and-promulgation-of-air-quality-implementation-plans-maryland-pm-10-test-methods)
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