Abstract
Metal oxide-based gas sensors, have been used in the detection of gaseous pollutants emitted from motor vehicles, such as CO, SO2, NH3, NOx, hydrocarbons (HC) etc. However, the problems that up to now are still faced by the metal oxide-based sensors are reviews their low sensitivity, low selectivity and lack of stability. Therefore, it is difficult, to the make such an accurate metal oxide-based sensor and stable over a long period of time. In this short review, it will be described the state-of-the-art technology, design and fabrication methods and various techniques that can be applied to improve the performance of metal oxide-based sensors. Keywords: gaseous pollutants, the motor vehicle emission, gas sensors, metal oxide
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