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Dapi Township, nestled within Yunlin County in western Taiwan, presents a unique geographic setting influencing its air quality. Located at coordinates 23.6494, 120.4254, the township occupies a relatively low-lying area of the Chiayi Plain, a fertile agricultural region. The terrain is predominantly flat, gradually rising towards the foothills of the central mountain range to the east. This proximity to the mountains can contribute to localized air stagnation, trapping pollutants during periods of calm weather. Dapi is situated approximately 15 kilometers inland from the Taiwan Strait, meaning direct marine influences on air dispersal are somewhat limited, though sea breezes can offer occasional relief. The surrounding landscape is dominated by intensive agriculture, particularly rice paddies and fruit orchards, alongside smaller pockets of light industry. Yunlin County as a whole is a significant producer of agricultural goods, and agricultural practices, including fertilizer use and biomass burning, contribute to particulate matter. The urban-rural gradient is pronounced; Dapi itself is a smaller township, but is connected to larger urban centres like Douliu City, creating transport corridors that can channel pollutants. The flat topography and limited natural ventilation exacerbate the impact of emissions from these sources, making Dapi particularly sensitive to regional air quality issues.

Dapi’s air quality follows a distinct seasonal pattern, heavily influenced by Taiwan’s subtropical monsoon climate. Spring (March-May) often sees increasing particulate matter from agricultural burning as farmers prepare fields for planting, coupled with dust storms originating from mainland China. Summer (June-August) brings the southwest monsoon, offering periods of cleaner air due to prevailing winds dispersing pollutants, but also high humidity which can promote secondary pollutant formation. Typhoons, common during this season, can temporarily improve air quality through rainfall and wind, but also cause localized flooding and disruption. Autumn (September-November) is generally considered the best time for outdoor activity, with stable, drier conditions and reduced agricultural activity. However, temperature inversions become more frequent, trapping pollutants near the ground. Winter (December-February) is often the most challenging period. The northeast monsoon brings cold, dry air from the Asian continent, and stagnant air masses accumulate due to weaker solar radiation. This leads to higher concentrations of particulate matter and ozone. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter months and periods of high pollution. Monitoring wind direction and avoiding peak traffic hours are also advisable.