California Air Resources Board

Inventory Guidance Documents

The ARB and the U.S. EPA offers guidance for use by those submitting inventories.

CTR Guidelines 2020-2021

ARB Inventory 2024 Guidelines
These guidelines state what data should be submitted by districts and when it is due. It is updated every year, usually around March.

AB 2588 Air Toxics "Hot Spots" Emission Inventory Criteria and Guidelines
These guidelines describe which facilities should submit toxic emission data, which pollutants should be reported, and the appropriate level of detail for facilities.

U.S. EPA Air Emissions Reporting Requirements (AERR) Guidelines
The AERR requires the state to submit inventory data on behalf of the districts every year.

Other Links

Mobile Source Models

Areawide Source Methods

Reference

Software