What's New

An update to California's GHG inventory, covering years 2000 to 2006, is now available.

The previous version of California's GHG inventory (covering 1990 to 2004) is still available in archive.

Background

The Greenhouse Gas (GHG) Inventory provides estimates of the amount of GHGs emitted to and removed from the atmosphere by human activities within California. The Air Resources Board is responsible for maintaining and updating California's GHG Inventory per AB 1803.

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". The current GHG inventory covers years 2000 to 2006. The emissions estimates are statewide estimates that rely primarily on state, regional or national data sources, rather than individual facility-specific emissions. GHG emissions estimates for 1990-1999 are included in the previous archived inventory. As estimates are refined to include additional years and improved estimation methods, new versions of the inventory are produced. The first version of the inventory is still available on the archive data page.

The State's emission reduction program under the Global Warming Solutions Act of 2006 (AB 32) utilizes the GHG inventory estimates. ARB inventory work provided the basis for developing the 1990 statewide emissions level and 2020 emissions limit required by AB 32. The difference between the 2020 emissions limit and the 2020 business-as-usual forecast estimate is the amount of emission reductions that must be achieved by the State through the Scoping Plan.

Highlights

• 1990 Statewide Emissions Level & 2020 Limit
• Current Inventory Data
• Documentation of Data Sources and Methods
• Graphs and Plots
• 2020 Business-as-usual Emission Forecast
• Archive of Previous Inventories