Table 1.

Droplet size distributions of respiratory origin (partly reproduced from Han et al. (2013).

Reference	Topic	Respiratory origin	Main result
Yang et al. (2007)	54 healthy subjects	cough	Size range from 0.62 to 15.9 $\mathrm{\mu }$m with the average mode of 8.35 $\mathrm{\mu }$m
Fennelly et al. (2004)	16 patients infected with tuberculosis	Cough	Most particles were in the respirable size range
Papineni and Rosenthal (1997)	Five healthy subjects	cough, mouth breathing, nose breathing, talking	87 %, 86 %, 88 %, and 84 % of the particles had diameters of less than 1 $\mathrm{\mu }$m for cough, mouth breathing, nose breathing and talking, respectively.
Asadi et al. (2019)	10–30 healthy subjects	Speaking, vocalization, breathing	Positive correlation between the rate of particle emission and the loudness. 1 to 50 particles per second (0.06 to 3 particles per cm3).
Edwards et al. (2004)	12 patients infected with influenza	Breath	Size range from 0.15 to 0.19 $\mathrm{\mu }$m
Fabian et al. (2008)	12 patients infected with influenza	Breath	over 87% of particles exhaled were under 1 $\mathrm{\mu }$m in diameter
Fabian et al. (2011)	Three healthy subjects and 16 patients infected with human rhinovirus	Breath	82% of particles detected were 0.300–0.499 $\mathrm{\mu }$m.