The key quote from the study: "To calculate exposure and infection risk, we use a comprehensive database on respiratory particle size distribution; exhalation

The key quote from the study: "To calculate exposure and infection risk, we use a comprehensive database on respiratory particle size distribution; exhalation flow physics; leakage from face masks of various types and fits measured on human subjects; consideration of ambient particle shrinkage due to evaporation; and rehydration, inhalability, and deposition in the susceptible airways. "