The danger of becoming infected with the coronavirus is especially high in en-closed spaces. This is because aerosols – which play a key role in the transmission of COVID-19 – increase the concentration of SARS-CoV-2 in indoor spaces. A new ventilation system developed by two Fraunhofer Institutes is able to filter the virus from ambient air. It then destroys the virus in a process known as cold combustion, leaving behind nothing but small quantities of carbon dioxide and hydrogen.