Wireless sensor networks have been used for environmental monitoring over the last twenty years. This paper presents an architecture based on a Wireless Mesh network of sensors (WMNS) to measure air pollution in areas where there is a lack of internet access. We are motivated by the fact that air pollution is emerging as a key threat to health, environment, economy and the quality of life for millions of people; as urbanisation, motorization and economic activity increases. The situation becomes critical when the concentration of air pollution is high. So there is a necessity to develop an indicator concerning air pollution. The only solution to this problem is based on the recent research in Wireless Mesh Networks for internet connectivity in urban and rural areas. This system was successfully developed and implemented in a short time, with low budget and limited human resources in European countries. The information from these sensors gives the air quality status of some harmful gases like NO2, NO, O3, CO, CO2. The information also helps to manage the urban air quality by controlling factors such as road traffic.