Adopted Air & Radiation Regulations
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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, [email protected].
Last edited 3/23/2026
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Regulation Title | Building Energy Performance Standards (BEPS) | | Purpose | The purpose of BEPS is to efficiently reduce greenhouse gas emissions from buildings over 35,000 square feet in Maryland. BEPS requires covered building owners to track their emissions and energy use through ENERGY STAR Portfolio Manager starting with calendar year 2024 data in 2025. Starting in 2030, building owners must meet emissions standards that become more stringent in 2035 and ultimately reach net zero direct GHG emissions by January 1, 2040.
The regulations include the following: performance standards that can be area-weighted to reflect the occupancy and use types of various buildings; an alternative compliance pathway allowing the owner to meet the emissions standards directly or by making an alternative compliance payment; flexibilities that allow campus-level compliance and district energy use; requirements for the provision of energy use data by electric and gas companies, exemptions for agricultural buildings, elementary and secondary school buildings, historic buildings, federal buildings, manufacturing buildings, and demolished buildings; and a handful of specific energy exclusions such as food service facilities, parking, and legally-required combustion equipment. | | COMAR | 26.28.01-.04 | | Effective Date | 12/23/2024 |
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| 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 |
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| 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 |
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| Regulation Title | Supplement 35 to Regulations for Control of Ionizing Radiation | | Purpose | Amendments to 26.12.01 | | COMAR | 26.12.01 | | Effective Date | 9/15/2025 |
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| Regulation Title | Anti-Tampering to Motor Vehicle Emission Control Devices | | Purpose | Repeal record-keeping requirements for vehicle dealers or other businesses regarding vehicle emissions inspections | | COMAR | 26.11.20.02 | | Effective Date | 3/30/2026 |
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| Regulation Title | Heating Fuel Provider Reporting Program | | Purpose | New regulation to establish reporting for heating fuel providers of the amount of heating fuel delivered for final sale or consumption in Maryland to inform triennial greenhouse gas emissions inventory and development of future policies such as a Clean Heat Standard | | COMAR | 26.11.44 | | Effective Date | 12/22/2025 |
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| Regulation Title | Advanced Clean Trucks Amendment | | Purpose | The purpose of this proposed action is to adjust language which clarifies compliance determinations and sales reporting requirements for vehicle manufacturers and add an additional certification pathway for medium-duty zero-emission vehicles. This will result in increased time for manufacturers to make up deficits, and prevent earned credits from being double counted under both the Advanced Clean Cars II and Advanced Clean Trucks rule | | COMAR | 26.11.43 | | Effective Date | 12/22/2025 |
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| Regulation Title | Maryland's CO2 Budget Trading Program / Regional Greenhouse Gas Initiative Amendments | | Purpose | Amendments to 26.09 | | COMAR | 26.09 | | Effective Date | 3/30/2026 |
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| Regulation Title | Fee Amendments | | Purpose | Amendments to the Air and Radiation Administration Fees for Permits and BEPS aligning with 2025 legislation | | COMAR | 26.11.17, 26.28.03 | | Effective Date | 3/30/2026 |
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| Number of Adopted Air Regulations : 17 |
