# Approval and Promulgation of Air Quality Implementation Plans; Massachusetts; Certification of Tunnel Ventilation Systems in the Metropolitan Boston Air Pollution Control District
> **Rule** · Direct final rule. · Published 2008-02-15 · Effective 2008-04-15 · 73 FR 8818
## Document
- **Document number:** E8-2745
- **Category:** air-emissions
- **Federal Register citation:** 73 FR 8818
- **CFR reference:** 40 CFR 52
- **Publication date:** 2008-02-15
- **Effective date:** 2008-04-15
- **State:** MA
- **EPA docket:** EPA-R01-OAR-2006-0641
## Abstract

EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Massachusetts. The SIP revision consists of technical revisions to Massachusetts regulation 310 CMR 7.38, "Certification of Tunnel Ventilation Systems in the Metropolitan Boston Air Pollution Control District." The amendments better define the emissions monitoring techniques for various types of tunnel ventilation systems, and provide flexibility in emission monitoring requirements. This action is being taken in accordance with the Clean Air Act.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/02/15/E8-2745/approval-and-promulgation-of-air-quality-implementation-plans-massachusetts-certification-of-tunnel)
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