# Air Plan Approval; Maryland; Continuous Opacity Monitoring Requirements for Municipal Waste Combustors and Cement Plants
> **Rule** · Final rule. · Published 2018-12-14 · Effective 2019-01-14 · 83 FR 64282
## Document
- **Document number:** 2018-27049
- **Category:** air-emissions
- **Federal Register citation:** 83 FR 64282
- **CFR reference:** 40 CFR 52
- **Publication date:** 2018-12-14
- **Effective date:** 2019-01-14
- **State:** MD
- **EPA docket:** EPA-R03-OAR-2018-0490
## Abstract

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the State of Maryland (SIP Revision 16-04). This revision pertains to clarifying continuous opacity monitoring requirements and visible emission standards for municipal waste combustors (MWCs) and Portland cement plants. This action is being taken under the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/12/14/2018-27049/air-plan-approval-maryland-continuous-opacity-monitoring-requirements-for-municipal-waste-combustors)
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