The detection of gases produced by cars becomes an important objective for different applications such as urban pollution control or for the development of car exhaust devices. The use of gas sensors can contribute to such objectives. At the moment, the performances of the gas sensors available on the market, especially SnO2 sensors, are often not sufficient to satisfy these needs. The major limitations are dependent on their poor selectivity and stability. Some examples of such problems are presented through field experiments in both types of application and some feasible improvements of the sensors are discussed. In urban pollution monitoring, it is necessary to take into account the irreversible action of SO2. The dual response to oxidising or reducing gases is a difficult problem to solve, especially for the NOx gases. Solutions with metallic filters above the sensing material are currently studied. In order to be able to use directly the sensors in car exhausts, new types of sensors are developed mainly on the basis of electrochemical devices. An example of such a new sensor is described with experimental results obtained on car exhausts.


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