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Traditional air quality monitoring detector can only display real-time data, but it doesn’t have data transmission capacity. Data collected by the instrument depends on the quality of sensors, and imported infrared air quality analyzer is very expensive. In order to solve these problems, Arduino Uno R3 is used as control core. A variety of gas sensors and Arduino Uno R3 form the real-time monitoring terminal. After data collected by sensors is processed by Arduino, it is transmitted by the technology of VANET to on-board unit or hand-held observer for real-time display. At the same time, data can be transmitted to the control center by Internet. This paper describes hardware structure and software design. The test results show that this system has the advantages of high reliability, good real-time performance and it has a very high practical value.