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 12/22​/​2023​

Regulation Title
Controls for Municipal Solid Waste Landfills
Establish Methane reductions, Incorporate EPA guidelines as necessary
COMAR 26.11.42
Effective Date6/12/2023

Regulation Title
Low Emissions Vehicle Program
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.
Effective Date9/18/2023

Regulation TitleVehicle Anti-Tampering Compliance
PurposeIt 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.
Effective Date2/7/2022

Regulation TitleVehicle Emissions Inspection Program (VEIP) - Joint Promulgation
PurposeEnhance and clarify the VEIP, and delay inspection for new vehicles.
COMARCOMAR 26.11.22 and 11.14.08
Effective Date1/23/2023

Regulation TitleRepeal Interprecursor Trading ERCs
PurposeRepeal Interprecursor ERC trading to align with EPA policy
Effective Date10/16/2023

Regulation TitleNOx Ozone Season Emission Caps for Non-trading Large NOx Units
PurposeAmend NOx ozone season caps
Effective Date4/15/2024

Regulation TitleVehicle Anti-Tampering Compliance Amendment
PurposeClarification that wholesale auctions are exempt from the regulation
Effective Date1/9/2023

Regulation TitleSupplement 32 to Regulations for Control of Ionizing Radiation
Incorporate NRC RATS 2018-3, 2019-1, 2020-1, 2020-2 and 2020-3 and

miscellaneous edits into COMAR
Update the Electronic Brachytherapy regulation.
Effective Date12/12/2022

Regulation TitleAgricultural Record Keeping Amendment
Effective Date1/23/2023

Regulation TitleSupplement 33 to Regulations for Control of Ionizing Radiation
Address the public comments that were submitted for Supplement 32 and miscellaneous edits regarding formatting and punctuation.
Effective Date8/7/2023

Regulation Title
Advanced Clean Trucks Program
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 Date12/25/2023

Number of Adopted Air Regulations : 11