Fig. 3.

Combined penetration values when both infectious and susceptible are wearing FFP2 masks, that is, mask-FF scenario (combined penetration for mask-SS scenario is shown in SI Appendix, Fig. S14), and at different shrinkage factors of w = 1 (solid lines), that is, no shrinkage, and w = 4 (dashed lines) as a function of particle diameter at exhalation, that is, wet diameter d₀. “Leak-free” curves correspond to $P_{ex}{P}_{in}$, “With leakage, adj.” curves correspond to $\mathit{TOL}\times \mathit{TIL}$, and “effective” curves correspond to $\mathit{TOL}\times \mathit{TIL}\times D_{rt}$. Respiratory tract deposition D_rt is shown in Inset for w = 1 and w = 4.