# Approval and Promulgation of Air Quality Implementation Plans; Maryland; Ambient Air Quality Standard for Ozone and Fine Particulate Matter
> **Rule** · Final rule. · Published 2006-06-14 · Effective 2006-07-14 · 71 FR 34257
## Document
- **Document number:** 06-5298
- **Category:** air-emissions
- **Federal Register citation:** 71 FR 34257
- **CFR reference:** 40 CFR 52
- **Publication date:** 2006-06-14
- **Effective date:** 2006-07-14
- **State:** MD
- **EPA docket:** EPA-R03-OAR-2005-MD-0012
## Abstract

EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Maryland. The revision consists of modifications to the ambient air quality standards for ozone and fine particulate matter and the replacement of the abbreviation "ppm" with parts per million in existing standards. This action is being taken under section 110 of the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/06/14/06-5298/approval-and-promulgation-of-air-quality-implementation-plans-maryland-ambient-air-quality-standard)
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