California Air Resources Board

The federal Clean Air Act establishes planning requirements for areas that exceed the health-based National Ambient Air Quality Standards. Areas are designated as nonattainment based on monitored exceedances of these standards. These nonattainment areas must develop an emissions inventory as the basis of a State Implementation Plan (SIP) that demonstrates how they will attain the standards by specified dates. An emission inventory is an estimation of the amount of pollutants discharged into the atmosphere that can be broken down by specified source categories in a certain geographical area and within a specified time span (e.g., in a calendar year). This webpage contains information regarding recent and historical submittals of Statewide emissions inventories into the California SIP.

• 2017 Baseline Inventory and Vehicle Miles Traveled Offset Demonstration for the 2015 70 ppb 8-hour Ozone Standard
• 2012 Baseline Inventory for the 2008 75 ppb 8-hour Ozone Standard

See the Emissions Inventory webpage for information on other CARB emissions inventories and related documentation.