Transmission the Coronavirus may occur through exhaled aerosol droplets from infected humans. There is still much controversy over whether aerosol transmission is important as a route of transmission. By measuring and modeling the dynamics of exhaled respiratory droplets, the authors assess the relative contribution of aerosols to the spreading of SARS-CoV-2. Dynamic modeling of the droplets allows us to account for aerosol persistence times in confined public spaces. The probability of infection by inhalation of aerosols when breathing in the same space can then be estimated using current estimates of viral load and infectivity of SARS-CoV-2. Their study of transmission of SARS-CoV-2 suggests that aerosol transmission is a possible but perhaps not a very efficient route, in particular from non-symptomatic or mildly symptomatic individuals that exhibit low viral loads. To prevent transmission, sufficient ventilation is of key importance.