Last reviewed on August 29, 2013

Inventory Data Archive - 1990 to 2004 Inventory

Illustration of a document archive with drawers for each greenhouse gas
GHG inventory archive


In November 2007, the California Air Resources Board published the 1990-2004 greenhouse gas (GHG) inventory, which compiled statewide anthropogenic GHG emissions and sinks. It included estimates for carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), sulfur hexafluoride (SF6), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs) for years 1990 through 2004. 

Each year, new activity, fuel consumption, and other data become available from California and federal agencies, international organizations, and industry associations. These new data enable staff to extend California's GHG inventory and, if necessary, adjust data that were used to estimate emissions for years already included in previously published inventories. GHG calculation methodologies often improve over time and are made more appropriate or more inclusive of the various sources of emissions. The latest edition of California's GHG inventory, covering years 2000 to 2009, is available on the current data page.

1990-2004 GHG Inventory (First edition, November 2007)

This is the first edition of California's GHG inventory published by the ARB in November 2007. The GHG emissions and sinks are categorized in three ways:

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

Select a subset of the 1990 inventory

bullet Query the 1990 inventory by economic sector and/or by activity. This interactive query tool allows you to select a subset of the inventory in a table, view it or download it to your computer, find out how each of the emissions values was estimated, and plot the data. More details on the query tool's help page.

Download the entire 1990-2004 inventory

Download the Technical Support Document

The technical support document detailing the data sources and methods used to develop version 1 of the GHG inventory is available for download below.

Archived 2020 GHG Forecast (October, 2008)

This California 2020 GHG emissions forecast, used in the AB 32 Scoping Plan, is the projected emissions that would occur in 2020 if no mitigation actions were taken, i.e., "business-as-usual" (BAU). This archived forecast was necessary to assess the amount of GHG reductions necessary to return California to 1990 emission level and is based on the 1990-2004 edition of GHG inventory.