How long can you safely be in a room with someone infected with COVID-19? MIT model offers finely tuned answers Users start by selecting a room type, like a classroom or an airplane. From there, they can control a wide array of variables to dial in the risk. and last updated 2020-12-12 17:50:27-05 SAN DIEGO (KGTV) â Nearly three-quarters of the students in San Diego County are currently learning from home, and those numbers donât make a lot of sense to MIT professor Martin Bazant. Bazant is one of the creators of the COVID-19 Indoor Safety Guideline. The free online tool simulates the fluid dynamics of respiratory droplets in various kinds of rooms to show users the risk of different indoor environments.