1/ It's been a pleasure working with @Wymelenberg & @Apphouman72 on this project. The simple V1.0 model is designed as a "platform" w/ easy incorporation of new info/data that become(s) available. It provides an educational tool for exploring risk reduction strategies. https://twitter.com/Wymelenberg/status/1305926152851091456

2/ The guts of the model is solution of a differential equation w/ multiple source & loss terms, including deposition of particles in three regions of the human respiratory system. Size-specific particle numbers are converted to deposited particle volume.

3/ Relative risks are pivoted off of V1.0 simulations for Restaurant X in Guangzhou, China with volume related to probability of infection based on a dose-response curve for a different human coronavirus (easily updated for SARS-CoV-2 when available).

4/ We intend to put out an improved version of V1.0 as V1.1 and are also working on a V2.0 now that will be much more powerful in terms of build-related factors, including recirculation and centralized filtration. Hope you will have a chance to explore V1.0 @safeairspaces.com