The Transportation and Air Quality Research Group, or TnAQ-RG for short, focuses on raising awareness of air quality issues caused by the direct and indirect impacts of transportation activities. This group aims to develop innovative and sustainable solutions to address increasing emissions and air pollution. Research within the TnAQ group covers various aspects, including: traffic flow performance on transportation infrastructure, traffic flow impacts, vehicle emission factors, pollution characteristics, and airborne microplastics under heterogeneous traffic conditions.