A method and a device for treating exhaust gas containing particles, include a particle separator and at least one particle agglomeration device positioned upstream of the particle separator in exhaust gas flow direction. The particle agglomeration device includes at least one apparatus for forming an electrical field and a particle buffer storage device, through which the exhaust gas can flow. The particles are stored on top of each other at the particle buffer storage device in such a way that particle agglomerates are formed, which are removed from the particle buffer storage device again after a short period of time and supplied to the particle separator for conversion. A motor vehicle having the device and performing the method is also provided.