Fig. 4.

Mean risk of infection as a function of (wet) exhale diameter cutoff $d_{0,\mathit{max}}$ when an infectious is breathing or speaking toward a breathing-only susceptible for a duration of 20 min considering (A) distancing, (B) mask, and (C) mixed scenarios. Other parameters used are w = 4, viral load ${\rho }_p={10}^{8.5}\hspace{0.17em}$ virus copies per mL, and ID${}_{63.21}$ = 200. Details of scenario-specific parameters, for example, f_d, are presented in the caption of Fig. 1.