# Quality Assurance Requirements for Continuous Opacity Monitoring Systems at Stationary Sources
> **Rule** · Direct final rule. · Published 2012-02-14 · Effective 2012-04-16 · 77 FR 8160
## Document
- **Document number:** 2012-3379
- **Category:** other
- **Federal Register citation:** 77 FR 8160
- **CFR reference:** 40 CFR 60
- **Publication date:** 2012-02-14
- **Effective date:** 2012-04-16
- **EPA docket:** EPA-HQ-OAR-2010-0873
## Abstract

The EPA is taking direct final action to establish quality assurance and quality control (QA/QC) procedures for continuous opacity monitoring systems (COMS) used to demonstrate continuous compliance with opacity standards in federally enforceable regulations. This action is necessary because we do not currently have QA/QC procedures for COMS. This action would require COMS used to demonstrate continuous compliance to meet these procedures (referred to as Procedure 3).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/02/14/2012-3379/quality-assurance-requirements-for-continuous-opacity-monitoring-systems-at-stationary-sources)
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