Measuring Virus Exposure Risk Using a CO2 Sensor While Traveling

hardaker writes: I wrote up the results from studying graphs of CO2 measurement data during a trip I took from Sacramento, California to London to attend the IETF-115 conference. Since CO2 is considered to be a potential proxy for measuring exposure to airborne viruses, it provided me with a rough guess about how safe (or not) I was at various points of my travel.
TL;DR: big conference rooms: good, busses: bad, everything else: in between.
"Numbers alone do not effectively measure risk absolutel