Sains Malaysiana 52(10)(2023): 2971-2983

http://doi.org/10.17576/jsm-2023-5210-18

 

Classifying Severity of Unhealthy Air Pollution Events in Malaysia: A Decision Tree Model

(Mengelaskan Keparahan Kejadian Pencemaran Udara Tidak Sihat di Malaysia: Hasil Model Pokok Keputusan)

 

NURULKAMAL MASSERAN1,*, RAZIK RIDZUAN MOHD TAJUDDIN1 & MOHD TALIB LATIF2,3

 

1Department of Mathematical Sciences, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

2Department of Earth Sciences and Environment, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

3Department of Environmental Health, Faculty of Public Health, Universitas Airlangga, Surabaya, East Java 60115, Indonesia

 

Diserahkan: 16 Jun 2023/Diterima: 2 Oktober 2023

 

Abstract

The application of data mining technique in dealing with real problems is popular and ubiquitous in various knowledge domains. This study proposes the concept of severity measures correspond to the characteristics of duration and intensity size for evaluating unhealthy air pollution events. In parallel with that, the present study also proposes a decision tree as a predictive model to deal with a binary classification corresponding to extreme and non-extreme unhealthy air pollution events, which is established based on threshold of the power-law behavior. In a similar vein, other characteristics, such as duration and intensity size, were also determined as important related features. A case study was conducted using the air pollution index data of Klang, Malaysia, from January 1st, 1997 to August 31st, 2020. The results found that the decision tree model can provide a high degree of precision and generalization with 100% accuracy in classifying a class for extreme and non-extreme events for the air pollution severity in the Klang area. In addition, a duration size is the most influential feature that leads to the occurrence of an extreme air pollution event. Thus, this study also suggests that authorities should exercise some vigilance precautions with respect to pollution incidents with a consecutive duration exceeding 11 hours.

 

Keywords: Air pollution classification; data mining; extreme air pollution; predictive model

 

Abstrak

Pengaplikasian teknik perlombongan data dalam menangani masalah dunia sebenar adalah popular dalam pelbagai domain pengetahuan. Kajian ini mengusulkan konsep ukuran keparahan sepadan dengan ciri tempoh masa dan saiz keamatan untuk menilai kejadian pencemaran udara yang tidak sihat. Selari dengan itu, kajian ini juga mengusulkan kaedah pokok keputusan sebagai model ramalan bagi kes pengelasan binari terhadap kejadian pencemaran udara tidak sihat yang melampau dan tidak melampau yang boleh dikenal pasti berdasarkan nilai ambang tingkah laku hukum-kuasa. Di samping itu, ciri lain iaitu tempoh masa dan saiz keamatan, juga dikenal pasti sebagai ciri berkaitan yang penting bagi suatu kes pencemaran udara. Dalam kajian ini, kajian kes telah dijalankan menggunakan data indeks pencemaran udara di Klang, Malaysia, dari  1 Januari 1997 hingga 31 Ogos 2020. Hasil kajian mendapati model pokok hasil dapat memberikan tahap ketepatan dan pengitlakan yang tinggi dengan ketepatan 100% dalam mengelaskan kelas bagi kejadian pencemaran melampau dan tidak melampau merujuk kepada keparahan suatu pencemaran udara di kawasan Klang. Selain itu, saiz tempoh masa dikenal pasti sebagai adalah ciri berpengaruh yang membawa kepada berlakunya kejadian pencemaran udara yang melampau. Oleh itu, kajian ini juga mencadangkan bahawa pihak berkuasa harus melaksanakan beberapa langkah berjaga-jaga jika kejadian pencemaran udara didapati berlaku dalam tempoh berturut-turut melebihi 11 jam.

 

Kata kunci: Model peramal; pencemaran udara melampau; pengelasan pencemaran udara; perlombongan data

 

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*Pengarang untuk surat-menyurat; email: kamalmsn@ukm.edu.my

 

 

 

 

 

 

 

 

 

 

 

 

   

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