Kar Kar, C., M. A. Rosli, A. S. Sadun, and N. A. Sabarudin. “Application of Internet of Things (IoT) Data Logger: A Comparison of Different Techniques for Assessing Ambient Air Pollution Levels”. Progress in Engineering Application and Technology, vol. 3, no. 1, June 2022, pp. 196-14, https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/6077.