Gas leakage detection devices have been on the market to address the detrimental effects of gas leaks. However, most of these devices are industry-scale, expensive, and unsuitable for household purposes. As a result, researchers carried out studies for alternative devices, yet certain gaps were still found and presented. With this, the study proposes an improved alternative gas leakage monitoring and detection system that addresses gaps in existing studies. The system would run in an event-driven architecture with additional sensors on top of an MQ5 gas sensor. The IoT component is powered using a Wemos D1 Mini with a built-in ESP8266 WiFi module that allows MQTT communication between a cloud server and a mobile application. By leveraging technologies such as Firebase, Webhooks, and Cloud Functions, users are alarmed of a gas leak remotely while triggered actuators alarm users locally. The study carried out several tests using a cigarette lighter to simulate a gas leak, and the system successfully sent out alarms when fire was detected or when gas levels exceeded the set threshold. The study employed an algorithm for minimizing false alarms using an Exponential Moving Average (EMA) and results show that EMA is not only effective at reducing false alarms but as well as false negatives. This research offers a promising solution, addressing gaps in existing alternatives for effective household gas leakage detection and monitoring.