California Air Resources Board

The Off-Road model is now being replaced by category specific methods and inventory models that are being developed for specific regulatory support projects. The categories listed below have been or are being updated with new methods and data.  Where available, new inventories and models are provided. If a category is not listed below, OFFROAD2007 is the current model for estimating emissions. A comprehensive web query tool, OFFROAD2021 is available to access the most recent model outputs from all offroad categories.