Since the global impact of COVID-19, we are acutely aware of the risk of diseases dispersed through the air. Virologists, epidemiologists, fluid mechanics and engineers will join forces in the MIST programme to better understand and prevent airborne viral transmission. Under various conditions, the researchers will study the infectiousness of viruses, the spread of fluid droplets in the air, and the influence of ventilation and the purification of air on the transfer of viruses. They will subsequently translate this knowledge into practical recommendations about which measures can be deployed in the most efficient, cost-effective and sustainable manner in various environments ranging from people at home to hospitals, schools and trains.