AirGuard : Smart IoT-Based Environmental & Confined Space Air Safety System

The proposed Smart IoT-Based CO₂ and O₂ Monitoring System presents an effective and reliable solution for monitoring air quality in confined and hazardous environments such as tunnels, wells, and industrial spaces. By integrating the MQ-135 CO₂ sensor and AO-03 oxygen sensor with the ESP-8266 microcontroller, the system ensures continuous and real-time detection of carbon dioxide concentration and oxygen levels. The wireless communication capability allows seamless data transmission to a mobile application for remote monitoring. The implementation of threshold-based analysis enables the system to identify unsafe environmental conditions instantly. When CO₂ levels exceed permissible limits or oxygen concentration drops below safe levels, the controller automatically activates a buzzer and sends real-time notifications to the mobile application. This immediate alert mechanism enhances safety and helps prevent potential health risks in enclosed environments. The mobile application further improves system usability by providing live data visualization and manual control over the buzzer. Users can remotely monitor environmental parameters and take timely action when required. Overall, the system is cost-effective, easy to deploy, and scalable, making it suitable for both small-scale and industrial applications. In future developments, the system can be enhanced by integrating additional sensors such as temperature and humidity sensors to provide a more comprehensive environmental analysis. Cloud-based storage can be implemented to maintain historical data records and perform trend analysis for better decision-making. Further improvements may include adding GSM-based alert systems to ensure notifications even without internet connectivity and incorporating AI-based predictive analytics to forecast hazardous conditions before they reach critical levels. These enhancements can improve the system’s intelligence, scalability, and practical applicability in real- world industrial safety management.

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