IoT based Air Quality Monitoring and Air Purifier System

Air pollution is an emerging issue all over the world, affecting health and the environment. This article suggests an IoT-based air quality monitoring and air purifier system to address this issue. The system utilizes NodeMCU ESP8266 as the main controller, providing Wi-Fi connectivity for IoT integration. It supports an MQ135 sensor to detect hazardous gases like CO2, NH3, and NOx, and a DHT11 sensor to detect temperature and humidity. An I2C LCD indicates real-time air quality data, making it user-friendly. To purify air, UV LEDs are utilized for killing bacteria and viruses, while a CPU fan is utilized for air circulation. A relay module is used for controlling the UV LEDs and the fan based on air quality inputs. A 12V adapter and connectors drive the system to ensure stable usage. Information is transmitted to a cloud platform and can be monitored and analyzed remotely. The system is economical, energy-efficient, and expandable for use indoors. The system continuously monitors air quality and automatically purifies the air when pollutant concentrations exceed a threshold. Testing proved reliable sensor reading, effective air cleaning, and robust IoT connectivity. The system can be installed in homes, offices, and small industries with a full solution for air quality management. The future development is to add more sensors, power optimization, and purification process improvement for bigger spaces. This technology has the potential to significantly improve public health and indoor air quality.