This paper introduces the design framework of the carbon dioxide ( CO2 ) node of the wireless sensor network oriented to the urban air quality monitoring.The designed node uses the lithium batteries as the energy source,and uses the LM3S811 as the mic-roprocessor to deal with the data collected by the sensor TGS4161.Moreover,the designed node adopts the CC2420 to implement the data transmission and wireless communication among different nodes.The field test results show that,compared with the current other CO2node,the designed node has the ad-vantages o...