Gas leaks are a major problem in the industrial sector, in the domestic environment, and in gaspowered vehicles such as CNG (compressed natural gas) buses, automobiles, and other vehicles. Establishing a gas leak detection system in sensitive areas is one of the prevention techniques to prevent accidents caused by gas leaks. The system uses a gas sensor to detect liquefied petroleum gas (LPG) leaks and uses Global System for Mobile Communication (GSM) to send an SMS to the person concerned about the leak. When the concentration of LPG in the air reaches a certain limit, the sensor detects a gas leak and the output of the sensor is low. The gas sensor detects the presence of gas, and the LED and buzzer are operated simultaneously by the microcontroller. The user receives an alert, which includes an SMS sent to the programmed mobile number.