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The concentration and distribution of fine particle matter (PM2.5) have been paid attention seriously by Taiwanese. In this study, the daily monitoring data of air quality were collected from 2014 to 2016 at 10 monitoring stations of air quality in the central Taiwan. After data analysis, we discussed the distribution phenomena and possible sources of PM2.5. Results indicated that PM2.5 concentrations at different monitoring stations decreased gradually. For instance, the PM2.5 concentration at Erlin county decreased 15.6% from 2014 to 2015 and 20.8% from 2015 to 2016, respectively. The PM2.5 concentration at Puli county decreased 4.6% from 2014 to 2015 and 31.1% from 2015 to 2016, respectively.
Results implied that the PM2.5 distribution was significantly influenced by wind velocity in the central Taiwan. Once the wind velocity declined, the PM2.5 started to accumulate and its concentration increased dramatically regardless of city or countryside. On the contrary, the PM2.5 concentration decreased immediately as the wind velocity decreased. In addition, it can be noticed that the PM2.5 concentration increased with other air pollutants simultaneously from 6 o'clock A.M. and decreased until nighttime. This implied that PM2.5 concentration maybe associated with people daily life and vehicles and industries may need more effective management.
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