# Approval and Promulgation of Air Quality Implementation Plans; Maryland; Clarification of Visible Emissions Exceptions
> **Rule** · Final rule. · Published 2007-08-01 · Effective 2007-08-31 · 72 FR 41891
## Document
- **Document number:** E7-14773
- **Category:** air-emissions
- **Federal Register citation:** 72 FR 41891
- **CFR reference:** 40 CFR 52
- **Publication date:** 2007-08-01
- **Effective date:** 2007-08-31
- **State:** MD
- **EPA docket:** EPA-R03-OAR-2005-MD-0002
## Abstract

EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Maryland. This revision consists of clarifications to the exception provisions of the Maryland visible regulations.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/08/01/E7-14773/approval-and-promulgation-of-air-quality-implementation-plans-maryland-clarification-of-visible)
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