Table 1. Prior studies of respiratory droplet size distributions.

Activity	Droplet size (µm)		Droplet number	Experimental conditions	Measurement methods	Adjustment for evaporationb	Reference
	GM (GSD)a	Range
Cough	12.1 (2.6)c	1–2000	5000	NA	Microscope	Factor of 4	[20]
	16.0 (5.8)d	1→1471	466	NA	Bone paper and 0.45-µm filter	As measured	[15]
	0.5 (1.7)e	<0.6–2.5	420	24°C, 45%RH;35°C, 23%RH	Optical particle counter (OPC), electron microscope	As measured	[16], [22]
	8.4 (2.2)	NA	NA	95% RH	Aerodynamic particle sizer (APS), scanning mobility particle sizer, OPC	As measured, assumed to be the original size	[17]
	13.5f	2–1000	NA	24.9°C, 73.9% RH	Interferometric Mie imaging (>2 µm), particle image velocimetry	As measured	[6]
	1.8g	0.3–20	NA	27°C, 59.4% RH	Expiratory droplet investigation system, APS	As measured	[18]
	96.6 (2.4)h	0–1500	42	28°C, 70% RH	Microscope, aerosol spectrometer	Factor of 3	[19]
Sneeze	8.2 (2.3)c	1–2000	1×106	NA	Microscope	Factor of 4	[20]
Speaki	11.9 (2.8)c	1–1000	252	NA	Microscope	Factor of 4	[20]
	16f	2–1000	NA	24.9°C, 73.9% RH	Interferometric Mie imaging (>2 µm), particle image velocimetry	As measured	[6]
	62.1 (1.8)h	0–1000	253	28°C, 70% RH	Microscope, aerosol spectrometer	Factor of 3	[19]

^aGeometric mean (GM) and geometric standard deviation (GSD) calculated by methods presented in [51] or cited as reported in the original papers.

^bWhether droplet sizes were adjusted upward to account for evaporation or were reported as measured.

^cCalculated from data in Table 3 in [20].

^dCalculated from data in Table 1 in [15]; droplet diameter upper end assumed to be 2000 µm.

^eCalculated from data in Table IV in [22].

^fNo data on GSD reported.

^gReported modal diameter.

^hCalculated from data in Table 2 in [19], only results from experiments without food dye were used.

ⁱCounting aloud from 1 to 100.