Particulate matter ( \(PM\) ) is one of the most problematic pollutants in the world because of its harmful impact on human health and the environment. Rail rolling stock braking can contribute to air pollution. Therefore, studying these emissions can help to develop cleaner and more sustainable rail transportation systems. The aim of the work conducted by the Rolling Stock Engineering Department of SNCF Voyageurs at the Railway Testing Agency (AEF) is to establish a comprehensive understanding of the connection between braking conditions and the particles concentrations. The insights gained from this research can lead to the development of a model that accurately predicts and quantifies the amount of particles released during braking. The research also involves comparing different types of brake pads to better identify which ones emit fewer particles during the same barking conditions. The article presents the analyses conducted on the parameters measured during bench brake testing. These parameters include speed, application and tangential force, braking distance, energy dissipation, and PM concentration.