ปริมาณสารมลพิษทางอากาศจำแนกตามฤดูกาลในพื้นที่ภาคเหนือตอนบนของประเทศไทย

Sujaree Damsri; Anongnat Promkaew

Authors

Sujaree Damsri Department of Mathematics, Faculty of Science and Technology, SuratThani Rajabhat University, Mueang, Surat Thani 84100, Thailand.
Anongnat Promkaew Department of Mathematics, Faculty of Science and Technology, SuratThani Rajabhat University, Mueang, Surat Thani 84100, Thailand.

Keywords:

air pollution, the upper northern region, season, Thailand

Abstract

This research aimed to study and compare air pollutant amounts classified by season in the upper northern region of Thailand by collecting air pollutant data from January 2014 to December 2022 from eight Air Quality Monitoring Stations of the Pollution Control Department, Ministry of Natural Resources and Environment. The researcher divided the data into three seasons as follows: the rainy season (May-October, 6 months), the winter season (November-February, 4 months), and the summer season (March-April, 2 months).Descriptive statistics were used to analyze the amounts of air pollutants. The amounts of air pollutants were compared across different seasons using the Kruskal-Wallis test, and the pairwise medians were compared using the multiple comparison method with the Mann-Whitney U test at a significance level of 0.05.

The results of the average monthly air pollutant amounts for 9 years between 2014-2022 have shown that the upper northern region of Thailand has the highest amounts of particulate matter with a diameter of less than 2.5 microns and 10 microns, and carbon monoxide gas in March. Ozone gas is highest in March-April. Nitrogen dioxide gas has the highest amounts in February and March. As for sulfur dioxide gas, the amount does not vary much each month. The air pollutants that exceed the standard value in every province include particulate matter with a diameter of less than 2.5 microns and 10 microns, and ozone gas. When the seasons change, the amounts of particulate matter with a diameter of less than 2.5 microns and 10 microns, and ozone gas, are significantly different at the 0.05 significance level.

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