# Approval and Promulgation of Air Quality Implementation Plans; Massachusetts; Revised Carbon Monoxide Maintenance Plan for Lowell
> **Rule** · Final rule. · Published 2011-05-13 · Effective 2011-06-13 · 76 FR 27908
## Document
- **Document number:** 2011-11722
- **Category:** air-emissions
- **Federal Register citation:** 76 FR 27908
- **CFR reference:** 40 CFR 52
- **Publication date:** 2011-05-13
- **Effective date:** 2011-06-13
- **State:** MA
- **EPA docket:** EPA-R01-OAR-2010-0445
## Abstract

EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Massachusetts. This SIP submittal contains revisions to the carbon monoxide (CO) maintenance plan for Lowell, Massachusetts. Specifically, Massachusetts has revised the contingency plan portion of the original maintenance plan. The intended effect of this action is to approve this revision to the Lowell CO maintenance plan. This action is being taken in accordance with the Clean Air Act.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/05/13/2011-11722/approval-and-promulgation-of-air-quality-implementation-plans-massachusetts-revised-carbon-monoxide)
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