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Ban Bang Sai, nestled within the Chon Buri province of Thailand, occupies a geographically significant position within the Eastern Economic Corridor (EEC), a region experiencing rapid industrial development. Located approximately 70 kilometers southeast of Bangkok, the town’s coordinates (13.4005° N, 100.9994° E) place it on a relatively flat alluvial plain, characteristic of the Chao Phraya River delta. This terrain, formed by centuries of sediment deposition, contributes to a generally low elevation, rarely exceeding 10 meters above sea level. The surrounding landscape is a blend of agricultural land – primarily rice paddies and fruit orchards – transitioning into industrial zones and urban sprawl as one approaches the larger city of Chon Buri. The proximity to the Gulf of Thailand, approximately 15 kilometers to the east, influences local weather patterns and can, under certain conditions, facilitate the dispersal of pollutants. However, the prevailing winds and the topography can also trap pollutants, particularly during periods of atmospheric stability. The urban–rural gradient is noticeable, with Ban Bang Sai exhibiting a mix of traditional Thai village life and the encroaching influence of industrial activity. The area’s location within a major transportation corridor, connecting Bangkok to the eastern seaboard, also contributes to localized air pollution from vehicular traffic. The presence of nearby industrial estates, including those specializing in automotive manufacturing and petrochemicals, represents a key factor impacting the region’s air quality profile, creating a complex interplay between natural geography and anthropogenic influences.

Ban Bang Sai’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from November to April, often witnesses a concerning increase in particulate matter. Reduced rainfall and lower humidity during these months contribute to the accumulation of dust and pollutants. Temperature inversions, common during the cooler nights of December and January, trap emissions close to the ground, exacerbating the problem. Agricultural burning, a traditional practice for land clearing and crop residue disposal, also significantly contributes to elevated pollution levels during this period, particularly in February and March. The monsoon season, from May to October, brings increased rainfall and higher humidity, naturally cleansing the atmosphere and dispersing pollutants. Stronger winds associated with the monsoon also help to ventilate the region. However, heavy rainfall can occasionally lead to flooding, which can temporarily release pollutants from inundated areas. Fog, particularly prevalent during the transition months of October and November, can also trap pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution periods. Maintaining indoor air quality through proper ventilation and air purification can also be beneficial. The agricultural cycle and industrial output are key drivers, with increased activity often correlating with poorer air quality.