As the post discusses, being unable to differentiate between the specific VOCs being detected makes these sensors, IMO, a net negative in home air quality devices. Mine will spike for a long time from opening a single beer or a fart (lol), so it doesn’t provide much information about whether there are concerning chemicals present as well.

AQMD [1] has a lot of great information about air quality sensors. Turns out that they're all pretty bad up to the thousand dollar range.

1. http://www.aqmd.gov/aq-spec/evaluations/voc/summary

And these are one of the more reliable sensors. Be aware of other sensors that print out a TVOC or even HCHO (formaldehyde) value but really only measure CO2.