On Interpersonal Distance, Time of a Conversation and Perceived Virus Exposure doi-10-17045-sthlmuni-20472165-0 https://doi.org/10.17045/STHLMUNI.20472165 Swedish National Data Service Svensk nationell datatjänst Landing page On Interpersonal Distance, Time of a Conversation and Perceived Virus Exposure doi-10-17045-sthlmuni-20472165-0 https://doi.org/10.17045/STHLMUNI.20472165 Svenson, Ola Swedish National Data Service Svensk nationell datatjänst Landing page Most COVID-19 infections are caused by airborne corona viruses. A model based on empirical and theoretical studies of dispersion of particles in the air was used to estimate a person’s virus exposures during different times and distances from a virus infected person. Participants judged perceived virus exposure at different interpersonal distances in a face to face conversation with an infected person. The smallest average face to face distance from an infected person without a mask that a participant judged as sufficiently safe was 13.5 meters. A majority (75%) of the participants underestimated the effect on virus exposure following a change of interpersonal distance. By way of contrast, judgments of exposure as a function of the duration of a conversation were unbiased. The results are important for administrators and communications to the general public about social distancing and infection risks. Access to data through an external actor. Åtkomst till data via extern aktör.