Yen-Yi Lee1, Yen-Kung Hsieh 2, Guo-Ping Chang-Chien 3,4, Weiwei Wang5

Center for General Education, Cheng Shiu University, Kaohsiung 83347, Taiwan
Ocean Affairs Council, Kaohsiung 80661, Taiwan
Super Micro Mass Research and Technology Center, Cheng Shiu University, Kaohsiung 83347, Taiwan
Department of Cosmetics and Fashion Styling, Cheng Shiu University, Kaohsiung 83347, Taiwan
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 246011, China

Received: February 16, 2019
Revised: March 17, 2019
Accepted: March 17, 2019
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Cite this article:
Lee, Y.Y., Hsieh, Y.K., Chang-Chien, G.P. and Wang, W. (2019). Characterization of the Air Quality Index in Southwestern Taiwan. Aerosol Air Qual. Res. 19: 749-785.


  • Analysis of atmospheric PM2.5, PM10, SO2, NO2, CO and O3 during 2015–2017.
  • Analysis of air quality index for southwestern Taiwan.
  • Analysis of air pollutants in different AQI class.


This study provides an investigation of atmospheric PM2.5, PM10, SO2, NO2, CO, and O3 in the period from 2015–2017 in the southwestern and central part of Taiwan. In addition, the seasonal distribution of six AQI classes and corresponding primary pollutants were further analyzed. The daily AQIs were 15–194 in 2015, 17–213 in 2016, and 16–184 in 2017, respectively. During the three year period, in the studied area, the mean proportions of levels with Grade I, II, III, IV, V, and VI were 3%–31%, 30%–57%, 17%–46%, 0%–12%, 0%–1% and 0% in spring; were 38%–76%, 21%–57%, 0%–10%, 0%–2%, 0% and 0% in summer; were 2%–45%, 34%–77%, 13%–36%, 0%–18%, 0% and 0% in fall, and were 0%–12%, 38%–67%, 24%–41%, 1%–22%, 0% and 0% in winter. Generally, it was found that summer has the best air quality and that winter has the worst, where spring and fall are similar in terms of air quality. PM2.5 was the typical primary air pollutant when the AQI classes were 51–200, followed by O3 in summer, spring and fall, and PM10 in winter. As for class 201–300, the primary air pollutant was O3 and the 300–500 class did not occur.

Keywords: AQI; PM2.5; PM10; SO2; NO2; CO; O3.


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