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 I took a trip from Sacramento, CA, US to London, UK 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.