Table 3.

Reported airborne transmission cases from the media. HS stands for Helsingin Sanomat, the largest subscription newspaper in Finland, and YLE stands for Finland’s national public broadcasting company Yleisradio.

Reference	Case	Present assumptions	Estimated number of inhaled aerosols N
HS 1	Sipoo wedding Mar 7, 2020: 96 persons, ‘several’ were infected, duration few hours, no symptomatic persons.	$V=1600{\mathrm{m}}^3$ $\lambda =1-50{\mathrm{s}}^{-1}$ $t=3\mathrm{h}$	$N\sim 50-500$
HS 2	Sipoo birthday party Mar 7, 2020. 70 guests, more than 10% got infection, no symptomatic persons.	$V=800{\mathrm{m}}^3$ $\lambda =1-50{\mathrm{s}}^{-1}$ $t=3\mathrm{h}$	$N\sim 100-1000$
Lu et al. (2020)	Restaurant, Guangzhou, China, Jan 24: 91 persons ate at the restaurant, 10 infected. Four infected persons sat in the same table as the asymptomatic index patient, three were in contact for 53 min and two for 73 min. Dining area was $145{\mathrm{m}}^2$.	$V=400{\mathrm{m}}^3$ $\lambda =1-50{\mathrm{s}}^{-1}$ $t=1\mathrm{h}$	$N\sim 20-200$
HS/YLE 3	Women’s Day concert, Mar 8, 2020, Helsinki. $<1700$ persons, at least 7 infected, duration $2\mathrm{h}$.	$V=10,000{\mathrm{m}}^3$ $\lambda =\log -\mathrm{normal}$ $t=2\mathrm{h}$	$N\sim 30-400$