PUFs are particles of nanometric size (less than 0.1 μm or 100 nanometers in diameter). They are so small that they behave like gases. As part of the PUF project, CRMT was responsible for the development of a measurement system capable of identifying these ultra-fine particles emitted by heavy vehicles.
This project was carried out within the framework of ADEME's AURATRANS projects, which partly contributed to its financing.