Smart IoT-Based Air Quality Monitoring and Alert System for Urban Environments

This paper describes a smart Internet of Things (IoT)-based air quality monitoring system capable of real-time monitoring and alerting for air quality in urban areas. The goal was to enhance public awareness of air quality while improving data resolution to support health-protective policies. The approach taken was to implement a network of low-cost IoT gas and particulate sensors, which are interlinked using Wi-Fi and cloud technology. Results indicate that the system provides reliable estimates and alerts for key pollutants, such as PM2.5, CO, and NO2, while contributing to reference stations and outperforming them in spatial resolution. The system can be considered a low-cost IoT solution for environmental monitoring and management in smart cities.