CHARACTERIZING AND MONITORING PM2.5 CHANGESIN MAP TA PHUT INDUSTRIAL ESTATE

The changes of daily fine particular matter (PM2.5) maximums are characterized and monitored in Map Ta Phut Industrial Estate situated in Rayong, the eastern province of Thailand. To achieve the goal, descriptive statistics and cluster analysis are utilized for identifying the essential patterns or characteristics of PM2.5 changes. The exponentially weighted moving average (EWMA) control chart then is applied in detecting to see whether the process shift is meeting set the daily Thailand’s national air quality standard. The results of work are taken by the only one monitoring station; the Health Promotion Hospital Map TaPhut (29T). It indicates that a seasonal and period of time during a day are impact on PM2.5 changes. The PM2.5 maximum are high in Winter while medium and low values are in Summer and Rainy season. In addition, the PM2.5 maximums are high from morning to early afternoon, slightly high from midnight to early morning, medium from afternoon to early evening and low from evening to midnight, respectively. Finally, the EWMA control chart potentially exhibits a critical signal as pointing out the eight days (December 8 to December 15 of 2021) not in-control state. The obtained findings are advantageous as a guideline to manage and control the number of days not exceeding the Thai limit or even though decrease the number of days exceeding the Thai limit.