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Jiaoxi occupies a strategic position within the Yilan Plain, acting as a vital transitional node between the formidable Xueshan Range to the west and the Pacific Ocean to the east. This low-lying urban center, situated at an elevation of approximately 20 to 50 meters, serves as a gateway to the scenic coastal regions of northeastern Taiwan. The town's urban character is defined by its historical association with geothermal activity and its role as a transit hub, nestled amidst a tapestry of lush agricultural landscapes and rolling foothills. Geographically, Jiaoxi is shaped by the Lanyang River, which traverses the plain, influencing local humidity and moisture levels. This specific topographical arrangement creates a unique microclimate that profoundly dictates air quality dynamics. The high mountains to the west function as a massive physical barrier, which can impede the horizontal dispersion of pollutants during periods of atmospheric stability. While the proximity to the ocean provides refreshing maritime breezes that generally facilitate cleansing, the basin-like structure of the Yilan Plain can occasionally induce temperature inversions. During these events, warmer air aloft traps cooler, more stagnant air near the ground, concentrating local emissions from vehicular traffic and small-scale commercial activities. Consequently, the urban-rural gradient in Jiaoxi is characterized by a delicate balance between the clean, mountain-fed air descending from the highlands and the localized anthropogenic aerosols concentrated within the valley floor, making the town's atmospheric health highly dependent on prevailing wind patterns. This interplay ensures Jiaoxi remains quite distinct from its neighboring towns and coastal areas.

The atmospheric narrative of Jiaoxi is defined by its subtropical climate and the dramatic influence of seasonal monsoons. During the winter months, from November to March, the region is dominated by the Northeast Monsoon. This period typically brings cool, moist, and relatively clean maritime air from the Pacific, which effectively ventilates the Yilan Plain and maintains high air quality. However, this season is also characterized by frequent fog and heavy mist, which, while not pollutants, can reduce visibility and impact respiratory comfort for some. As the year transitions into spring and summer, the Southwest Monsoon takes hold, introducing warmer and more humid air. While this brings much-needed rainfall to the agricultural zones, it can also lead to periods of atmospheric stagnation. During the late spring and early summer, the risk of temperature inversions increases; warmer air layers can settle over the plain, trapping moisture and localized pollutants near the surface. For residents and visitors, the most favorable months for outdoor activities and strenuous exercise are generally the winter and early spring months, provided the fog is not too dense. Conversely, during peak humidity or stagnant summer afternoons, sensitive groups—including children, the elderly, and those with pre-existing respiratory conditions—should monitor local conditions and consider reducing prolonged outdoor exertion. By understanding these seasonal shifts, one can better navigate Jiaoxi’s unique environment, balancing the refreshing mountain breezes with the occasional challenges posed by the region's complex, moisture-heavy meteorological patterns. This proactive approach ensures personal health and total enjoyment throughout the entire changing year.