Rural County Methodology Review, Refinement, and Update

Project Description

The Texas Commission on Environmental Quality (TCEQ) works with local planning districts, the Texas Department of Transportation (TxDOT), and the Texas Transportation Institute (TTI) to provide on-road mobile source emissions inventories of air quality pollutants. This requires constant update of emissions inventory and control strategy reduction estimates to include the latest methodologies and data. Task 1 of this project was to develop updates to a critical component of the Texas on-road mobile source inventory development procedure, the rural county emissions inventory development methodology. Rural county inventories are critical because these counties provide boundary condition information for Texas nonattainment area photochemical modeling. Also, with implementation of the eight-hour National Ambient Air Quality Standards (NAAQS), additional nonattainment areas are likely to be designated, which may include counties that do not yet have link-based travel demand network models. The following activities were completed under this task: identify aspects of the non-link, on-road mobile inventory development procedure, which can be updated using state-of-the-art data sets and calculation methodologies; refine the non-link, on-road mobile inventory development procedure consistent with areas identified for updating; and prepare documentation.

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