This Digital Temperature and Humidity Sensor with AQI (Air Quality Index) measurement from 0–500 is a smart environmental monitoring device designed for homes, offices, labs, and industrial applications. It features a built-in WiFi interface with a user-friendly Web UI for configuration, monitoring, and calibration. The device provides real-time Temperature, Humidity, and AQI data accessible over WiFi without the need for a gateway or additional hardware. Powered through a 5V DC USB port, the sensor offers easy installation, low power consumption, and robust digital output. Ideal for IoT projects, indoor air-quality monitoring, smart buildings, and automation systems.