# Approval and Promulgation of Air Quality Implementation Plans; Maryland; State Boards Requirements
> **Rule** · Direct final rule. · Published 2013-12-06 · Effective 2014-02-04 · 78 FR 73442
## Document
- **Document number:** 2013-28956
- **Category:** air-emissions
- **Federal Register citation:** 78 FR 73442
- **CFR reference:** 40 CFR 52
- **Publication date:** 2013-12-06
- **Effective date:** 2014-02-04
- **State:** MD
- **EPA docket:** EPA-R03-OAR-2013-0650
## Abstract

EPA is taking direct final action to approve a revision to the State of Maryland State Implementation Plan (SIP). The SIP revision addresses the State Boards' requirements for all criteria pollutants of the National Ambient Air Quality Standards (NAAQS). EPA is approving this SIP revision in accordance with the requirements of the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/12/06/2013-28956/approval-and-promulgation-of-air-quality-implementation-plans-maryland-state-boards-requirements)
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