At the end of February, a cooperation agreement was signed with Nibelungen-Wohnbau, allowing our working group to use Nibelungen-Wohnbau's research apartments to measure the microclimate and indoor air quality. The apartments offer an excellent infrastructure for this purpose, as they are equipped with sensors to measure important boundary conditions (e.g. ventilation behaviour). We are looking forward to the upcoming measurement campaign, which is expected to start in spring 2026. In the course of the study, measurements will also be carried out outside the research flat, e.g. with a measuring bicycle.