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Beigang, nestled in Yunlin County, Taiwan, occupies a unique geographic position within the western coastal plain. Situated at coordinates 23.5667°N, 120.3000°E, the city’s terrain is largely flat, characteristic of its alluvial origins formed by sediment deposition from the Beigang River and other smaller waterways draining from the surrounding hills. This proximity to the Taiwan Strait influences local weather patterns, bringing maritime air masses and occasional typhoons. Beigang isn’t a heavily industrialised centre, but lies within a region containing significant agricultural activity, particularly rice and fruit cultivation, and some light manufacturing. The urban-rural gradient is relatively sharp; moving inland quickly transitions from the denser city centre to expansive agricultural lands. This landscape impacts air quality as agricultural practices can contribute to particulate matter from dust and biomass burning, while the coastal location can trap pollutants during periods of calm winds. The relatively low elevation, averaging around 20 meters above sea level, limits atmospheric dispersion. The Beigang River itself, while vital for irrigation, can also act as a conduit for pollutants during periods of low flow. Understanding this interplay between land use, topography, and proximity to the sea is crucial for assessing and mitigating air quality challenges in Beigang.

Beigang’s air quality follows a distinct seasonal pattern heavily influenced by Taiwan’s subtropical monsoon climate. Winter (December-February) often sees poorer air quality due to temperature inversions, trapping pollutants near the ground, and reduced rainfall which limits atmospheric cleansing. Calm wind conditions exacerbate this, allowing locally generated emissions from traffic and small-scale industry to accumulate. Spring (March-May) brings increased rainfall and more frequent wind events, generally improving air quality, though dust from agricultural activities can be a concern. Summer (June-August) is typically the cleanest period, with the southwest monsoon bringing prevailing winds that effectively disperse pollutants offshore. However, typhoons, while providing temporary cleansing rains, can stir up dust and debris. Autumn (September-November) sees a transition period; the monsoon weakens, and the risk of stagnant air increases, leading to a gradual decline in air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during winter and autumn. Avoiding strenuous outdoor activity on still, hazy days is advisable. Monitoring weather forecasts and paying attention to local air quality reports is essential for protecting health throughout the year.