Development of a Low-Cost Air Quality Monitoring System Using the MQ2 Sensor

Year : 2025 | Volume : 12 | Issue : 02 | Page : 9 15
    By

    Deepanshi Saxena,

  • Mahak Jain,

  • Mansi Singh Parihar,

  • Harshit singh,

  • Monika Kapoor,

  1. Student, Department of Electronics and Communication, Laksmi Narain College of Technology, Shyamala Hills, Bhopal, India
  2. Student, Department of Electronics and Communication, Laksmi Narain College of Technology, Shyamala Hills, Bhopal, India
  3. Student, Department of Electronics and Communication, Laksmi Narain College of Technology, Shyamala Hills, Bhopal, India
  4. Student, Department of Electronics and Communication, Laksmi Narain College of Technology, Shyamala Hills, Bhopal, India
  5. Professor, Department of Electronics and Communication, Laksmi Narain College of Technology, Shyamala Hill, Bhopal, India

Abstract

Air pollution is becoming a major environmental problem, especially in cities, due to the quick expansion of industry and the rise in car emissions. The air is contaminated with dangerous chemicals such as carbon monoxide, nitrogen oxides, and fine particles, which have a major negative influence on human health by raising the risk of heart and respiratory diseases. Because of their dense populations and heavy traffic, urban areas are particularly affected by this problem. Air pollution also contributes significantly to acid rain, climate change acceleration, and ecological damage. Stricter pollution control regulations, the adoption of cleaner technologies, better public transportation, and more environmental awareness are all necessary to meet this problem. Real-time monitoring of air quality is essential to assess pollution levels and take preventive measures. This study suggests an Internet of Things (IoT)-based air quality monitoring system that uses a MQ2 gas sensor and a NodeMCU microcontroller to identify dangerous gases. Through linked devices, the system gathers real-time data that allows users to effectively monitor environmental conditions, encouraging awareness and proactive pollution management. To facilitate remote access and analysis, the system tracks the quality of the air, displays data in real time on an LCD screen, and uploads it to an Internet of Things platform. This makes it possible to monitor the environment continuously and raise awareness of air pollution levels. The proposed system offers a cost-effective, real-time, and scalable solution for environmental monitoring applications by measuring the accurate presence of harmful gases including Carbon Monoxide(CO), Methane (CH4), Liquified Petroleum gas and particulate matter.

Keywords: IoT, Air Quality Monitoring, Node MCU, MQ2 Sensor, Pollution, LCD Display, Blynk

[This article belongs to Recent Trends in Sensor Research & Technology ]

How to cite this article:
Deepanshi Saxena, Mahak Jain, Mansi Singh Parihar, Harshit singh, Monika Kapoor. Development of a Low-Cost Air Quality Monitoring System Using the MQ2 Sensor. Recent Trends in Sensor Research & Technology. 2025; 12(02):9-15.
How to cite this URL:
Deepanshi Saxena, Mahak Jain, Mansi Singh Parihar, Harshit singh, Monika Kapoor. Development of a Low-Cost Air Quality Monitoring System Using the MQ2 Sensor. Recent Trends in Sensor Research & Technology. 2025; 12(02):9-15. Available from: https://journals.stmjournals.com/rtsrt/article=2025/view=208222


References

  1. Pal P, Gupta R, Tiwari S, Sharma A. IoT based air pollution monitoring system using Arduino. International Research Journal of Engineering and Technology (IRJET). 2017 Oct;4(10):1137-40.
  2. Arroyo P, Lozano J, Suárez JI, Herrero JL, Carmona P. Wireless sensor network for air quality monitoring and control. Chemical Engineering Transactions. 2016 Sep 20;54:217-22.
  3. Karuppusamy P. A sensor based IoT monitoring system for electrical devices using Blynk framework. Journal of Electronics and Informatics. 2020 Aug 27;2(3):182-7.
  4. Marques R, Gonçalves C, Ferreira R. Airsense–Low-Cost Indoor Air Quality Monitoring Wireless System. InInternational Conference on Disruptive Technologies, Tech Ethics and Artificial Intelligence 2024 Jul 3 (pp. 269-280). Cham: Springer Nature Switzerland.
  5. Kumar A, Kumari M, Gupta H. Design and analysis of iot based air quality monitoring system. In2020 International Conference on Power Electronics & IoT Applications in Renewable Energy and its Control (PARC) 2020 Feb 28 (pp. 242-245). IEEE.
  6. Suhaidi MI, Yunus NH. Development of Blynk IoT-based air quality monitoring system. Journal of Engineering Technology. 2021 Jan;9:63-8.
  7. Galceran SJ, Villarico FJ, Omao JJ, Estaniel LC, Saldo IJ, Calo JR, Dandoy MJ. Development and Comparison of Arduino Based MQ-2 and MQ-6 LPG Leak Sensors. American Journal of Sensor Technology. 2023;7(1):1-9.
  8. Mahmood SN, Alani S, Hasan FF, Mustafa MS. Esp 8266 node mcu based weather monitoring system. InProceedings of the 1st International Multi-Disciplinary Conference Theme: Sustainable Development and Smart Planning, IMDC-SDSP 2020, Cyperspace 2020 Jun 28 (pp. 150-163).
  9. Shah HN, Khan Z, Merchant AA, Moghal M, Shaikh A, Rane P. IOT based air pollution monitoring system. International Journal of Scientific & Engineering Research. 2018 Feb;9(2):62-6.
  10. Rani SU, Rajarajeswari S, Jaimon JG, Ravichandran RO. Real-time air quality monitoring system using MQ-135 and thingsboard. Journal of critical reviews. 2020;7(18):4107-15.
Regular Issue Subscription Original Research
Volume 12
Issue 02
Received 07/04/2025
Accepted 15/04/2025
Published 17/04/2025
Publication Time 10 Days
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