Generally, the methane leak detection in landfills is performed manually. Although nontoxic, methane is a flammable gas, which can become highly dangerous for humans. In this paper, we introduce BotCH4, an integrated hardware and software system that aims to automatize methane emission monitoring in landfills and biogas production sites. BotCH4 consists of a robot and an Android application. The robot comprises, among other equipment, an Arduino board, a gas sensor and GSM and Bluetooth modules. Through Android application one can remotely control the robot's movements and measure the methane concentration in certain spots. The result in parts per million (ppm) is sent by SMS. The robot also has line followers sensors making it capable of operating in automatic mode, following a predetermined circuit. Index Terms - Biogas, Greenhouse Effect, Landfills, Methane, Robotics.