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Fangliao is situated in the southernmost reaches of Taiwan, serving as a critical transitional node within Pingtung County. This township is defined by its position on a fertile coastal plain, nestled between the rugged silhouettes of the Central Mountain Range to the east and the expansive waters of the Taiwan Strait to the west. Its urban character is a hybrid of rural agricultural clusters and small-scale commercial centers, reflecting a low-density development pattern that maintains a strong urban–rural gradient. The terrain is predominantly flat, which allows for the unimpeded movement of maritime air masses. This proximity to the coast is the primary driver of its local air quality, as the prevailing sea breezes frequently flush the basin of stagnant pollutants. However, the town's position also makes it susceptible to regional atmospheric shifts. To the north and west, the industrial belts of southern Taiwan contribute a baseline of anthropogenic emissions, while the surrounding agricultural zones introduce organic aerosols and particulate matter from seasonal land management. The low elevation ensures that Fangliao rarely experiences the severe temperature inversions common in mountain valleys, yet the convergence of humid oceanic air and terrestrial heat creates a distinct microclimate. Consequently, the air quality is heavily influenced by the interaction between the purifying effects of the Pacific and South China Sea currents and the intermittent influx of pollutants carried by regional wind patterns across the narrow strait. This unique positioning ensures that while the air is generally fresher than in Taipei, it remains sensitive to larger geopolitical atmospheric events.

In Fangliao, air quality follows a distinct tropical rhythm governed by the East Asian Monsoon. During the winter months, from November to February, the region experiences its most challenging air quality. The prevailing northeast monsoon pushes cold air masses across the island, often trapping transboundary pollutants from the mainland and industrial emissions from northern Pingtung against the coastal plains. During these periods, temperature inversions can occur, leading to a buildup of fine particulate matter. Conversely, the spring months transition into a period of instability, where sporadic rainfall helps scrub the atmosphere, though agricultural burning in nearby fields can cause short-term spikes in smoke and haze. Summer brings the most favorable conditions; strong southwesterly winds and frequent convective thunderstorms provide natural ventilation and precipitation, effectively washing away airborne pollutants. This is the peak window for outdoor recreation and athletics. Autumn represents a stabilizing period, though the humidity remains high, which can exacerbate the sensation of smog during stagnant wind events. Sensitive groups, including children and the elderly, should exercise caution during the winter peak, limiting prolonged outdoor exposure when haze is visible. Utilizing air filtration indoors during the northeast monsoon is recommended to mitigate the impact of regional aerosols. Overall, the cycle is a tug-of-war between the cleansing power of the ocean and the seasonal arrival of continental air masses, making summer the healthiest season for the local populace in Fangliao.