Adopted Air & Radiation Regulations

List of Final Effective Actions

The Secretary of the Department can adopt a regulation upon expiration of the 45th day after it is proposed in the Maryland Register.

After a regulation is adopted, a Notice of Final Action is published in the Maryland Register. If any non-substantive changes are made to a regulation from the originally proposed text, the Notice of Final Action shows the changes with an explanation for the changes. The Final Action also specifies the date on which the adopted regulations will go into effect.

Click here to see a full list of Code of Maryland Regulations (COMAR) Title 26 - Department of Environment. The following list reflects the actions within the past two years. Historical records are available upon request.

Contact Information

For additional information, email Carolyn A. Jones

Last edited 9/6/2024

Regulation Title	Controls for Municipal Solid Waste Landfills
Purpose	Establish Methane reductions, Incorporate EPA guidelines as necessary
COMAR	26.11.42
Effective Date	6/12/2023

Regulation Title	Low Emissions Vehicle Program
Purpose	Purpose: The purpose of this action is to update incorporate by reference Regulation .02 to reflect the changes made by California since the last Maryland update in 2019 – including advanced clean cars II.
COMAR	26.11.34.02
Effective Date	9/18/2023

Regulation Title	Vehicle Anti-Tampering Compliance
Purpose	It is illegal to remove or render inoperative any emission control device which was installed on a vehicle when it was manufactured, and the Department may perform inspections.
COMAR	26.11.20.02
Effective Date	2/7/2022

Regulation Title	Vehicle Emissions Inspection Program (VEIP) - Joint Promulgation
Purpose	Enhance and clarify the VEIP, and delay inspection for new vehicles.
COMAR	COMAR 26.11.22 and 11.14.08
Effective Date	1/23/2023

Regulation Title	Repeal Interprecursor Trading ERCs
Purpose	Repeal Interprecursor ERC trading to align with EPA policy
COMAR	COMAR 26.11.17.01 and 26.11.17.04
Effective Date	10/16/2023

Regulation Title	NOx Ozone Season Emission Caps for Non-trading Large NOx Units
Purpose	Amend NOx ozone season caps
COMAR	26.11.40
Effective Date	4/15/2024

Regulation Title	Vehicle Anti-Tampering Compliance Amendment
Purpose	Clarification that wholesale auctions are exempt from the regulation
COMAR	26.11.20.02
Effective Date	1/9/2023

Regulation Title	Supplement 32 to Regulations for Control of Ionizing Radiation
Purpose	Incorporate NRC RATS 2018-3, 2019-1, 2020-1, 2020-2 and 2020-3 and miscellaneous edits into COMAR 26.12.01.01. Update the Electronic Brachytherapy regulation.
COMAR	26.12.01.01
Effective Date	12/12/2022

Regulation Title	Agricultural Record Keeping Amendment
Purpose	Amendment
COMAR	26.11.18.05
Effective Date	1/23/2023

Regulation Title	Supplement 33 to Regulations for Control of Ionizing Radiation
Purpose	Address the public comments that were submitted for Supplement 32 and miscellaneous edits regarding formatting and punctuation.
COMAR	26.12.01.01
Effective Date	8/7/2023

Regulation Title	Advanced Clean Trucks Program
Purpose	The purpose of this action is to add a new Chapter to incorporate by reference the Advance Clean Truck Program of California to Maryland.
COMAR	26.11.43
Effective Date	12/25/2023

Regulation Title	Control of Emissions from Municipal Solid Waste Landfills - Amendment
Purpose	Amendments
COMAR	26.11.42
Effective Date	8/5/2024

Regulation Title	Permits, Approvals, and Registration – Title V Permits
Purpose	Amend Regulation .07 and repeal Regulation .24. This will remove the affirmative defense provisions under the Clean Air Act.
COMAR	26.11.03
Effective Date	8/5/2024

Regulation Title	Supplement 34 to Regulations for Control of Ionizing Radiation
Purpose	minor clarifications to meet NRC
COMAR	26.12.01
Effective Date	8/19/2024

Number of Adopted Air Regulations : 14