The Sensaphone Indoor Air Quality sensor will allow you to monitor levels of pollution from 0100% with any Sensaphone that will accept a 4-20mA input signal. Popular applications include schoolrooms, office buildings, and parking garages. The Air Quality sensor uses a tin dioxide semiconductor sensor to detect oxidizable gases and is specially designed to have high sensitivity to gaseous organic materials which are components of indoor air pollutants. These air contaminants include cigarette smoke, cooking exhaust, automobile exhaust, solvents and many others. The sensor requires a 24VDC power supply.