Abstract-This paper presents research project conducted to realize a system able to measure autonomously a gas concentration in dangerous or hardly reachable places and locate the toxic source origin using commercialized micro Unmanned Aerial Vehicle (UAV), the AR Drone 2.0 from Parrot. The system relies upon the use of this UAV, an Arduino Nano board interfacing the gas sensor, and a GPS chip. A computer software also helps interfacing the hardware with user data.