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Regulation

Regulation  310 CMR 7.00: Air Pollution Control

Date: 09/26/2025
Organization: Massachusetts Department of Environmental Protection
Regulatory Authority: M.G.L. Chapter 111, Section 2B: Air Pollution Emergencies
M.G.L. Chapter 111, Sections 142A-142M: Pollution or Contamination of the Atmosphere
M.G.L. Chapter 21H: Solid Waste Facilities
Official Version: Massachusetts State Bookstore

These regulations establish emission limits, pollution control standards, and permit requirements for a range of facilities and activities. MassDEP implements these rules to prevent and control air pollution where it originates. This ensures abundant clean air for Massachusetts residents, workers, and visitors.

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Current Regulations

These regulations were last amended in September 2025. MassDEP has proposed additional amendments listed below.

► 310 CMR 7.00: Air Pollution Control (pdf from Secretary of State; reflects September 2025 and earlier amendments)

Note: This is an unofficial version of Commonwealth regulations and is posted here for the convenience of the public. It is not an official statement of the regulations.

Proposed Amendments

Proposed amendments that have undergone public comment are listed below. For proposed amendments open to public comment, please refer to MassDEP Public Hearing & Comment Opportunities.

Closed for comment: 310 CMR 7.00 Appendix C Operating Permit and Compliance Program
MassDEP is proposing to amend 310 CMR 7.00 Appendix C Operating Permit and Compliance Program to remove the Emergency Affirmative Defense provisions as required by recently updated U.S. Environmental Protection Agency regulations.

Recently Promulgated Amendments

September 2025

MassDEP finalized amendments to 310 CMR 7.00: Air Pollution Control to adopt the revised primary annual fine particulate matter National Ambient Air Quality Standard (NAAQS) promulgated by the U.S. Environmental Protection Agency (EPA) on February 7, 2024, and to adopt the revised secondary annual sulfur dioxide NAAQS promulgated by EPA on December 10, 2024.

February 2025

MassDEP finalized amendments to 310 CMR 7.40: Final Heavy-duty Omnibus Amendments.

November 2024

MassDEP has finalized revisions to the Greenhouse Gas Emissions Reporting regulation (310 CMR 7.71) to implement registration and greenhouse gas (GHG) emissions reporting requirements for companies selling and distributing heating fuels to homes and businesses in Massachusetts, including suppliers of natural gas, fuel oil, and propane and implement a reporting requirement for fuel storage facilities.

March 2024

MassDEP finalized amendments to 310 CMR 7.00 Air Pollution Control to require a cumulative impact analysis (CIA) for Comprehensive Plan Approval (CPA) applications for facilities located in or near environmental justice (EJ) populations. 

September 2023

MassDEP promulgated new regulation 310 CMR 7.41: Large Entity Reporting Requirement.

March 2023

December 2022

MassDEP has finalized revisions to 310 CMR 7.24(3): Dispensing of Motor Vehicle Fuel that would update the list of California Air Resources Board (CARB) Stage I enhanced vapor recovery (EVR) systems and components approved for installation in Massachusetts.

November 2022

MassDEP finalized amendments to 310 CMR 7.71: Greenhouse Gas Reporting and 310 CMR 7.75: Clean Energy Standard.

October 2022

MassDEP finalized amendments to 310 CMR 7.75: Clean Energy Standard that would provide regulated entities with additional certainty on the need to accelerate the schedule for decarbonizing the electricity supply.

March 2022

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