From 2014 to 2019, STI assessed near-road air quality, conducted emissions and air quality modeling, and provided near-road support services for a Transportation Pooled Fund (TPF) led by WSDOT. The TPF partnership also included the U.S. Federal Highway Administration (FHWA) and state Departments of Transportation from Arizona, California, Colorado, Ohio, Texas, and Virginia.
Our work for the TPF included developing tools, analyses, and other materials to address near-road requirements. Our peer-reviewed publications discussed our findings on forecasted emissions and measured U.S. near-road air quality. We helped the TPF partnership better understand (1) emissions data in order to identify situations in which traffic will not create air quality problems; (2) modeled vs. measured near-road air quality; (3) the potential air quality benefits of near-road barriers (sound walls and vegetation); and (4) U.S. near-road air quality trends. To support our sponsors, STI also developed an information-exchange website for transportation and air quality planners, and presented research findings at numerous venues, including the U.S. Transportation Research Board Annual Meeting.