Wind tunnel investigations have been conducted in the wake of three simplified car models, commonly called Ahmed body, with 0, 25 and 35 rear slant angle respectively. The upstream velocity is 14.3m/s, leading to a Reynolds number based on the model height of 4:95 104. Velocity measurements have been recorded with a Laser Doppler Velocimetry system. An innovative data treatment method has been developed to obtain accurate and reliable flow statistics regardless the seeding conditions. Wake flow properties such as the recirculation length, turbulence intensity or turbulent kinetic energy are similar to results found in the literature. Further works will consist in measuring the nanoparticle concentration fields in the wake of the same models, in order to better understand the particle dynamics and especially the interaction between turbulent vortical structures and particles. The final goal of the project is to identify key parameters that influence particle path and possible infiltration in the following vehicle through air entrances.