Utilities
Texas A&M Transportation Institute (TTI) and the Texas Department of Transportation (TxDOT) work with other air quality planners to develop consistent, transparent, statewide methods that are used to develop transportation emission inventories. These methods deal with mathematical procedures for estimating regional on-road emissions using a variety of primary data sources such as the number and types of vehicles registered in Texas, outputs from regional travel demand models, field counts of the number and types of vehicles using Texas roads, fuel formulations, and meteorological data.
This section hosts documents that describe these methods in sufficient detail for all air quality practitioners – from technical analysists who actually develop emission inventories to planners charged with interpreting and applying the results of emission inventories.
Methods and Procedures
Texas A&M Transportation Institute (TTI), the Texas Department of Transportation (TxDOT) and other stakeholders have developed a suite of transportation utilities designed to simplify the process of technically developing regional emission inventories.
This section hosts the latest instruction manuals that describe in detail how to use these utilities. The utilities themselves are available by request from TTI staff.
Utilities
This section hosts a number of other transportation air quality resources useful for practitioners.
The resources listed below include guidance from the Environmental Protection Agency (EPA), past studies that form the foundation of Texas’ on-road inventory methods, and other useful links.
Resources