For the third time, the Technical University of Berlin, in cooperation with the Federal Environment Agency, will host the symposium “Ultrafine Particles in Outdoor and Indoor Air.” The event will take place on September 19 and 20, 2019, in the architecture building at the Technical University of Berlin’s Ernst-Reuter-Platz campus. The lecture program will be accompanied by poster presentations and an exhibition. A detailed program of the event can be found here. Comde-Derenda GmbH will participate as an exhibitor.