TRAC, in conjunction with ODOT, will analyze transportation projects for their reduction of ozone precursors (NOx and Hydrocarbons), and their net impact on fuel consumption. In order to make the scoring for air quality factors more consistent the following analysis methods for air quality will be used:
- Road Projects - air quality factors will be calculated based on build and no build conditions programed into ODOT's Travel Demand Forecasting Model. For smaller projects (e.g. single intersections or interchanges), air quality factors can be calculated using other modeling software such as Synchro.
- Transit Projects - Air quality factors will be calculated based on the reduction in VMT and applying standard emission rates.
- Freight Projects - Air quality factors will be calculated based on the reduction in TMT and applying standard emissions rates.