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.go

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