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Car cabin air quality monitoring can effectively be analysed using metal oxide semiconducting (MOS) gas sensors. In this paper, commercially available gas sensors are compared with fabricated MoO3-TiO2 and MoO3- WO3 thin films. The laboratory tests showed that the MoO3 based sensors possessed comparable gas sensing properties. The MoO3(75%)-TiO2(25%) sensor has a response 74% higher relative to the best commercial sensor tested.