Abstract :

This project presents an IoT-based real-time indoor air quality monitoring and alert system using the ESP8266 microcontroller. The system continuously monitors indoor environments to detect harmful gases and ensure human safety. It integrates MQ-135, MQ-7, and MQ-5 gas sensors to measure air pollution, carbon monoxide, and flammable gas leakage, respectively. These sensors collect real-time environmental data related to air quality. The sensed data is processed and transmitted wirelessly to an IoT cloud platform. This allows realtime visualization and remote monitoring of air quality parameters. An LCD display is used to show live sensor readings locally. A buzzer alert system provides instant warnings when gas concentrations exceed safe limits. The system enables early detection of hazardous gas leaks. Overall, it offers a cost-effective, energy-efficient, and reliable indoor air monitoring solution.