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. 2020 Sep 24;185:107307. doi: 10.1016/j.buildenv.2020.107307

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Fig. 1 — Transmission risk of droplets with different sizes at different times. Upper part: Typical trajectories of particles in the air (based from Ref. [6]). Lower part: Illustration of different transmission routes (based from Ref. [1,7]). F_s: aerodynamic forces, F_g: the force of gravity, F_r: the horizontal force when ejected from human mouth, d: diameter, d’: diameter after evaporation.