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Mandatory Greenhouse Gas Reporting Regulation

This page updated November 4, 2014

2014 PROPOSED Amendments to Regulation

2014 ARB Proposed Mandatory Reporting Regulation
The Air Resources Board conducted a hearing on September 18, 2014, to consider amendments to the Regulation for the Mandatory Reporting of Greenhouse Gas Emissions (MRR).  The updates support the Cap-and-Trade Program, integrate Cost of Implementation Fees Regulation data reporting, and increase clarity, accuracy, and completeness of the Regulation.

The Board adopted Resolution 14-32, approving the revisions proposed in the Staff Report for adoption, with a small number of modifications proposed by staff. Modifications to MRR were released for public comment on October 2, 2014 in a “Notice of Public Availability of Modified Text,” together with a copy of the regulation, indicating the proposed modifications.

Subject to final approval by the Office of Administrative Law, the proposed revisions would become effective on January 1, 2015. 

2013 Regulation - Current Version

2013 ARB Mandatory Reporting Regulation
The Regulation for the Mandatory Reporting of Greenhouse Gas Emissions was originally approved in 2007 and revised in 2010, 2012, and 2013. The current Regulation became effective on January 1, 2014.
  • Complete Regulation - Unofficial version of complete regulation prepared by ARB staff
  • Key Dates for GHG mandatory reporting
  • Regulatory Edition of Regulation - Regulation showing only changed sections in underline/strikeout (Final Regulation Order)
  • 2013 Rule Making Documents including Final Statement of Reasons, Initial Statement of Reasons, and other documents
  • Legal Edition of Regulation - Official Office of Administrative Law official version of regulation provided by individual regulation sections (search on title 17, Div. 3, chapter 1, subchapter 10,  article 2, starting with section 95100)


2012 ARB Mandatory Reporting Regulation
2010 ARB Mandatory Reporting Regulation
  • Complete Regulation - Unofficial version of complete regulation compiled by ARB staff
  • Regulatory Edition - Regulation including underline/strikeout changes, and all associated regulatory documents

U.S. EPA GHG Reporting Regulation

Unofficial Electronic Compilation

ARB’s Regulation for the Mandatory Reporting of Greenhouse Gas Emissions (title 17, California Code of Regulations (CCR), sections 95100-95157) (MRR) incorporated by reference certain requirements promulgated by the United States Environmental Protection Agency (U.S. EPA) in its Final Rule on Mandatory Reporting of Greenhouse Gases (Title 40, Code of Federal Regulations (CFR), Part 98).  Specifically, section 95100(c) of MRR incorporated those requirements promulgated by U.S. EPA as published in the Federal Register on October 30, 2009, July 12, 2010, September 22, 2010, October 28, 2010, November 30, 2010, December 17, 2010, and April 25, 2011.

The unofficial electronic compilation of selections from the U.S. EPA GHG regulation included below is provided by ARB staff solely for the reader’s convenience.  The official legal versions of the incorporated CFR provisions from the Federal Register are available, with the incorporated Federal Register notice and date, at

For each subpart, this unofficial compilation combines the various incorporated Federal Register versions into one document for the reader’s convenience; however, this compilation is not an official edition of either the CFR or the CCR.  While reasonable steps have been taken to make this unofficial compilation accurate, the officially published requirements, found within the incorporated Federal Register notices with the dates listed above, take precedence if there are any discrepancies.

Unofficial Electronic Compilation of U.S. EPA Part 98 GHG Regulations
Referenced by ARB Mandatory Reporting GHG Regulation

General Provisions Subpart A
General Stationary Fuel Combustion Sources Subpart C
Electricity Generation Subpart D
Cement Production Subpart H
Glass Production Subpart N
Hydrogen Production Subpart P
Iron and Steel Production Subpart Q
Lead Production Subpart R
Lime Manufacturing Subpart S
Nitric Acid Production Subpart V
Petroleum Refineries Subpart Y
Pulp and Paper Manufacturing Subpart AA
Suppliers of Petroleum Products Subpart MM
Suppliers of Natural Gas and Natural Gas Liquids Subpart NN
Suppliers of Carbon Dioxide Subpart PP

For questions please contact:
Sector Contacts or Patrick Gaffney, Climate Change Reporting Section, 916.322.7303