An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Maryland SIP, General Administrative Provisions, Continuous Opacity Monitoring Requirements

 State:   Maryland 
* Agency:   MD-Department of the Environment
* Regulation Type:   Rule
* Rule #:   COMAR
* Rule Title:    Maryland SIP, General Administrative Provisions, Continuous Opacity Monitoring Requirements
* State Effective Date:   02/15/2016
* Final Federal Register Date:   12/14/2018
* Federal Register Citation #:   83 FR 64282
 Superseded /
  Rescinded Date 


1.  Revision made for Revisions and Amendments to Regulations for Continuous Opacity Monitoring, Continuous Emissions Monitoring, and Quality Assurance Requirements for Continuous Opacity Monitors - 11/7/16 effective 12/7/16 81 FR 78048 this action added different state effective dates represented in this notice...state effective 8/22/10.

2.   State Effective Date:   07/20/2015,  Final Federal Register Date:   03/28/2018,  Federal Register Citation #:   83 FR 13192; (c)(106) Requirement to use TM 90-01 is removed. Exceptions: A(4), B(4), D(2)(c), and F.  Adds new subsections (A)(5) and (F)

3.  2/15/2016 State Effective date, Federal Register  12/14/2018, 83 FR 64282, 1. Add new subsections A(6), B(5) and B(6). 2. Revise subsection B(3). 3. Remove subsection F. Previous approval 3/28/2018 (83 FR 13192).

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.