TABLE I.

The definition and size range of virus-containing droplets and particles.

Droplet type	Definition	Size range
Droplet nuclei	Formed from the evaporation of respiratory droplets	$d_p<\mathrm{10\hspace{0.17em}}\mu \mathrm{m}$
Small droplets	Formed from the respiratory activities	$d_p<60\hspace{0.17em}\mu \mathrm{m}$
Large droplets		$d_p>60\hspace{0.17em}\mu \mathrm{m}$
Aerosol particles	A suspension of solid or liquid particles in a gas	${\mathrm{0.002\hspace{0.17em}}\mu \mathrm{m}<d}_p<100\hspace{0.17em}\mu \mathrm{m}$