# Quality Assurance Requirements for Continuous Opacity Monitoring Systems at Stationary Sources
> **Rule** · Direct final rule; announcement of extension of comment period. · Published 2012-03-08 · Effective 2012-04-16 · 77 FR 13977
## Document
- **Document number:** 2012-5433
- **Category:** other
- **Federal Register citation:** 77 FR 13977
- **CFR reference:** 40 CFR 60
- **Publication date:** 2012-03-08
- **Effective date:** 2012-04-16
- **EPA docket:** EPA-HQ-OAR-2010-0873
## Abstract

The EPA is extending the comment period for the direct final rule titled, "Quality Assurance Requirements for Continuous Opacity Monitoring Systems at Stationary Sources," that were published in the Federal Register on February 14, 2012. The 30-day comment period is scheduled to end on March 15, 2012. The extended comment period will close on April 30, 2012. The EPA is extending the comment period because of a request we received in a timely manner.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/03/08/2012-5433/quality-assurance-requirements-for-continuous-opacity-monitoring-systems-at-stationary-sources)
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