City-wide mobile air quality measurement system

In this paper we present an air quality measurement system that can be used to generate a map of the air quality in a city. The system is made of stations that can be attached to buses and taxis and gather data about air quality along the day as they travel in the city. Each station has sensors to measure the concentration of different gases, a position sensor (GPS) and a GSM/GPRS communication module to transmit the data to a central server. Each station is self-sufficient in terms of energy through the use of a battery and solar panels. The data server can be accessed through the internet using a browser and presents the results in real time overlapped onto a Google map of the city indicating, with different colors, the concentration of each measured gas (CO, NO₂, O₃, SO₂, and CO₂).