Design and Development of Air Quality Monitoring and Alert Systtem using IoT

Abstract: In the air, there are many dust particles and pollutant gases such as carbon dioxide and carbon monoxide that created an air pollution. The indoor and outdoor air pollution has brought the illness and harmful effect to human health. This creates a need for an IoT Alarm Air Quality Monitoring System to detect the dust particle, pollutant gases, temperature and humidity in the surrounding. The objective of this research work is to develop an indoor and outdoor air quality monitoring system for different air quality parameters (carbon dioxide and carbon monoxide), temperature, humidity, and dust concentration (air particle). Besides, the Node-RED dashboard and Android app are developed for real-time remotely applications in this system. The system performance is evaluated by testing the sensor used in the research work. In this research work, ESP-32, MQ7, MQ135, DHT22, and DSM501A are mainly used to develop the hardware. The MQTT is implemented as publish-subscribe network protocol to transfer the data as a message with the specific topic name. In the MQTT, the Node-RED dashboard, Android app and hardware are the MQTT client which are able to publish and subscribe the message. The Node RED dashboard acts as a live dashboard for monitoring and alarming purpose whilst the Android Studio is used to develop an Android app for the monitoring and alarm system in the smartphone. The Node-RED dashboard and Android app are able to display the data and notification message for different parameters on healthy or unhealthy level. The user can activate and deactivate the alarm system in the Node-RED dashboard or Android app as well

Keywords: Air Quality Monitoring, IoT, ESP32, MQ-7, MQ-135, MQTT, Node-RED, Real-Time Monitoring, Smart Alert System.