Last reviewed on June 30, 2015

California Greenhouse Gas Emission Inventory - 2015 Edition

2015 Edition of the GHG Emission Inventory Released (June 2015)
bullet GHG emissions from 2000 to 2013 are now available. Links to data and documentation can be found below.
bullet Carbon dioxide equivalent values are calculated using the IPCC's Fourth Assessment Report Global Warming Potential values. More information.


The greenhouse gas (GHG) emissions inventory provides estimates of the amount of GHGs emitted within California. The Air Resources Board is responsible for maintaining and updating California's GHG Inventory per H&SC §39607.4 in support of AB 32 goals and programs. The GHG inventory focuses on primarily anthropogenic sources. Natural sources are not included in the inventory.

The inventory includes estimates for carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and fluorinated gases with high global warming potentials which includes sulfur hexafluoride (SF6), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and nitrogen trifluoride (NF3). An updated emission inventory is published annually to include additional years and improved estimation methods. Archives of all previous inventory data and documentation are available on the archive page.

Emissions by GHG Emissions by Sector
Pie chart of contribution to 
			  California's GHG emission inventory by GHG Pie chart of contribution to California's GHG emission inventory by main sector
Click the graph for more information
CO2 CH4 N2O HGWP piebyGHG piebyGHG

Data Overview

Statewide emission estimates rely on state, regional or federal data sources, and on aggregated facility-specific emissions reports from ARB's GHG Mandatory Reporting Program (MRR). In particular, 2009 through 2013 MRR facility level data are used for compiling statewide emissions from electricity generation, refineries, cement plants, lime and nitric acid production. Calculation methodologies are consistent with the 2006 IPCC guidelines. The current inventory uses global warming potential (GWP) values from the IPCC Fourth Assessment Report, consistent with First Update to the AB32 Scoping Plan and USEPA's current national inventory. Full documentation of data sources and methods is available below or by using the detailed documentation index.

In preparation for each new edition of the inventory, recalculations are made to correct errors, incorporate new methodologies or, most commonly, to reflect changes in statistical data supplied by other agencies. Emission estimates are recalculated for all years to maintain a consistent time-series following IPCC recommendations for developing GHG inventories. Thus the new inventory may report a different emission level for an earlier year than previous inventory versions.

The California GHG inventory is categorized in three ways:

  1. Scoping Plan; follows the categories identified in the ARB 2008 Scoping Plan.
  2. Economic sectors; allows for comparison with other ARB emission inventories, which are similarly categorized.
  3. IPCC Process-oriented categories; follows the IPCC categorization to ensure comparability with international inventories.

Data Links

Download a Summary

Download the Entire Inventory

Query the Inventory

bullet Query the inventory by economic sector and/or by activity. This interactive query tool allows you to select a subset of the inventory, graph it or download it to your computer. Each value also contains links to detailed methodology pages. More details on the query tool's help page.


Download Reports

Go To Detailed Documentation Index

bullet Interactive documentation index by IPCC category

Original (1990-2004) Inventory

GHG emissions prior to 2000 are included in the 1990-2004 GHG Emission Inventory published in November 2007 (data available in the 1990 Level & Limit section of this site). This inventory provided the basis for developing the 1990 statewide emissions level and 2020 emissions limit required by the Global Warming Solutions Act of 2006 (AB 32).

For general questions regarding California's Greenhouse Gas Emission Inventory, please contact: Anny Huang, Manager, Emission Inventory Analysis Section, Phone: (916) 323-8475