An Improved Air Quality Monitoring System Based On Wireless Sensor Networks

Wireless Sensor Networks (WSNs) are widely applied in many fields, in which air quality monitoring is a very important application. In this paper we build an air quality monitoring system using WSN, which consists of sensor nodes, gateway nodes, mobile nodes and monitoring center. Furthermore, a solar energy power supply module is designed to increase the system lifetime. Moreover, in order to ensure communication reliability and position accuracy, the Global System for Mobile communications (GSM) and the Global Position System (GPS) are integrated into the system. In addition, the monitoring method is improved by combining the Static Wireless Sensor Network (SWSN) and Mobile Wireless Sensor Network (MWSN), in which the mobile node collects information along a specific route, which solves the problem that some sensors could be broken out of doors. The above hardware and software design are introduced in detail. The experimental results show that the designed system is effective and efficient for real-time urban air quality monitoring of temperature, humidity, PM2.5, CO2 and O3.

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