Supervisory Control And Data Acquisition (SCADA) refer to the overall set of process control system systems that remotely monitor and measure remote sensors from a centralized location. Implementation of wireless SCADA system using microcontroller is the simple and basic way to monitor the atmospheric physical quantity like temperature and gas. To monitor the temperature and CO2 gas over different sites as real time application. A base station and distributed sensor nodes are suggested. A wireless technology like GPRS (General Packet Radio Service) is used to connect the nodes & base station. Through wireless network various data collect by various sensors.