Due to the numerous problems raised by the increase in the emission of pollutant gases in the atmosphere, it has become essential a more effective monitoring of air quality. With that, several studies published in recent years have shown a series of mechanisms and techniques with ability to monitor air quality in a variety of ways. Approaching it, this work proposes a platform formed by a wireless sensor network, with the ability to monitor the levels of pollution at several points simultaneously. In addition, was implement the data mining tool, where by means of algorithms classification based on artificial intelligence concepts, it is possible that a more advanced analysis of air quality is performed. The platform was used for the monitoring of two public places, which have large traffic of vehicles and people daily, for a period of 12 consecutive weeks. On weekdays, peaks of 703 ppm of CO2 concentration were measured between 06:00 and 07:00 pm by the sensors located near the highways or avenues with higher traffic of cars. Conversely, indices around 500 ppm were the lowest obtained near 6:00 am where the car traffic is very low. This is the best time for hiking. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018