BreathX: A Personal Air Quality Checker using IOT

Abstract— Air pollution has become one of the most critical challenges in today’s world, especially in urban areas like Delhi where the Air Quality Index (AQI) frequently rises to hazardous levels. Poor air quality leads to severe health issues including respiratory problems, allergies, and long-term diseases. However, individuals often lack real-time awareness about the actual quality of the air they breathe.To address this issue, we have developed “Breath X – The Personalized Air Quality Monitor System”, an IoT-based solution that provides real-time monitoring of environmental parameters. The system is built using a NodeMCU (ESP8266) microcontroller integrated with sensors such as DHT11 for temperature and humidity, MQ135 for detecting gas concentration, and an ultrasonic sensor for smart system activation. An OLED display presents the readings instantly, while the data is simultaneously uploaded to the ThingSpeak cloud platform for visualization and storage.The proposed system not only displays real-time environmental conditions but also lays the foundation for future enhancements like integration of PM2.5/PM10 sensors, mobile notifications, and personalized health recommendations. With its low cost, portability, and cloud connectivity, Breath X has the potential to become a personal environmental companion, empowering individuals to make informed health and lifestyle decisions in polluted environments. Keywords—Air Quality Monitoring, IoT, NodeMCU (ESP8266), DHT11, MQ135, Ultrasonic Sensor, OLED Display, ThingSpeak, Cloud Computing, Personalized Health Insights, Smart Environment, Real-Time Monitoring.