Pandemic spread of coronavirus (SARS-CoV-2) can be inhibited by breaking chains of transmission and thereby slowing its spread. Exhaled aerosols represent one of the main transmission routes for infections. In the »AVATOR« project, several Fraunhofer institutes are therefore investigating ways to reduce the risk of infection by aerosol-borne viruses in enclosed spaces. Using the dynamic multiscale simulator developed by our experts, we calculate aerosol propagation in indoor environments.