Last reviewed on May 13, 2014

California Greenhouse Gas Emission Inventory


2012 Inventory Released (May 2014)
bullet The 2000 to 2012 greenhouse gas emission inventory is now available. Links to data and documentation can be found below.
bullet Please note that, starting with this edition of the inventory, 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 and in support of AB 32.

The inventory includes estimates for carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), sulfur hexafluoride (SF6), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs), which are often referred to as the "six Kyoto gases", plus nitrogen trifluoride (NF3). An updated emission inventory is published annually to include additional years, and improved estimation methods.

The current GHG inventory covers years 2000 to 2012. The emission estimates are statewide estimates that rely both on state, regional or national data sources, and on aggregated facility-specific emissions reports. In particular, 2009 through 2012 facility level data from the GHG Mandatory Reporting Program were used for compiling statewide emissions from electricity generation, refineries, cement plants, lime and nitric acid production.

2012 Inventory Data Overview

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

Previous (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), which 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