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Air Quality Monitoring Using MQ135 Gas Sensor and Arduino Uno

Author

Listed:
  • Manoj kumar

    (Department of Electrical Engineering IIMT College of Polytechnic)

  • Garvit Mishra

    (Department of Electrical Engineering IIMT College of Polytechnic)

  • Ayush Sharma

    (Department of Electrical Engineering IIMT College of Polytechnic)

  • Ashish Shaini

    (Department of Electrical Engineering IIMT College of Polytechnic)

  • Sahil Saxena

    (Department of Electrical Engineering IIMT College of Polytechnic)

Abstract

This paper presents the design and implementation of an air quality monitoring system based on an MQ135 gas sensor and an Arduino Uno microcontroller. The MQ135 sensor detects common pollutants (e.g. CO₂, NH₃, benzene, smoke) by measuring changes in air conductivity, and its analogy output is processed by the Arduino board. Sensor readings are calibrated against known conditions, and then converted to parts-per-million (PPM) levels. The system displays real-time air quality readings on an LCD and can trigger alerts when thresholds are exceeded. Data collection and analysis are demonstrated through sample readings in different environments. The system’s accuracy, limitations, and potential improvements (such as IOT connectivity, mobile apps, and machine learning) are discussed. This project shows that a low-cost MQ135/Arduino platform can provide continuous air quality data for environmental monitoring.

Suggested Citation

  • Manoj kumar & Garvit Mishra & Ayush Sharma & Ashish Shaini & Sahil Saxena, 2025. "Air Quality Monitoring Using MQ135 Gas Sensor and Arduino Uno," International Journal of Latest Technology in Engineering, Management & Applied Science, International Journal of Latest Technology in Engineering, Management & Applied Science (IJLTEMAS), vol. 14(5), pages 1097-1101, May.
    • Handle: RePEc:bjb:journl:v:14:y:2025:i:5:p:1097-1101
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