This system detect Gas Leakage (like LPG leak, Butane leak, Methane leak) or any such petroleum based gaseous substance that can be detected using MQ6 Sensor. Setup an GSM based Alert and send SMS (3 alert messages) to consumer numbers (input inside the Arduino program) Produce a sound alarm upon gas leak and stop the alarm once gas leak is under control (gas presence in atmosphere is under normal range) Display status in an LCD using a 16×2 LCD module.We have used a LPG gas sensor module to detect LPG Gas. When LPG gas leakage occurs, it gives a HIGH pulse on its AO pin and Arduino continuously reads its DO pin. When Arduino gets a HIGH pulse from LPG Gas module it shows “LPG Gas Leakage Alert” message on 16x2 LCD and activates buzzer which beeps again and again until the gas detector module doesn\\\'t sense the gas in environment. When LPG gas detector module gives LOW pulse to Arduino, then LCD shows “No LPG Gas Leakage” message\\\'s high and send message to consumer mobile number. Applications of SMS based LPG gas leakage detection system using GSM: 1) This project can be used in Industries, Home, Hospitals, lab , gas distribution chamber etc. Advantages of SMS based LPG gas leakage detection system using GSM: 1) This project is easy to use and it gives send text to alert indication to the user.