# Air Plan Approval; Massachusetts; Boston Metropolitan Area, Lowell, Springfield, Waltham, and Worcester Second 10-Year Carbon Monoxide Limited Maintenance Plan
> **Rule** · Final rule. · Published 2019-07-01 · Effective 2019-07-31 · 84 FR 31206
## Document
- **Document number:** 2019-13936
- **Category:** air-emissions
- **Federal Register citation:** 84 FR 31206
- **CFR reference:** 40 CFR 52
- **Publication date:** 2019-07-01
- **Effective date:** 2019-07-31
- **State:** MA
- **EPA docket:** EPA-R01-OAR-2018-0789
## Abstract

The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the Commonwealth of Massachusetts. This revision includes the second 10-year limited maintenance plan (LMP) for Carbon Monoxide (CO) for the Boston Metropolitan Area, as well as for the cities of Lowell, Springfield, Waltham, and Worcester. This LMP addresses maintenance of the CO National Ambient Air Quality Standard (NAAQS) for a second 10-year period beyond the original re-designation to attainment. This action is being taken in accordance with the Clean Air Act.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/07/01/2019-13936/air-plan-approval-massachusetts-boston-metropolitan-area-lowell-springfield-waltham-and-worcester)
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