Significant air pollution and health impacts are linked to roadway proximity. As a result, the U.S. EPA now mandates continuous near-road air pollution measurements in urban areas and requires transportation agencies to model near-road pollutant concentrations. State and local agencies are also taking steps, such as performing pilot near-road measurement studies, to augment federal mandates. In addition, many agencies are encouraging smart growth—more diverse and dense land uses that can sometimes bring people closer to roads. Thus, agencies are working to better understand and minimize near-road pollution problems. STI's integrated teams of air quality scientists, analysts, modelers, mapping specialists, and software engineers apply state of the art tools and processes to assist our clients with near-road pollution issues.