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Huwei, nestled in Yunlin County, Taiwan, occupies a crucial position within the island’s western coastal plain. Located at coordinates 23.7200, 120.4354, the city’s terrain is predominantly flat, characteristic of the alluvial plains formed by the numerous rivers flowing westward to the Taiwan Strait. This flatness contributes to potential air stagnation, particularly during calmer weather patterns. Huwei’s elevation is low, averaging around 20 meters above sea level, further reducing atmospheric dispersion. The city is situated within a significant agricultural zone, renowned for its production of vegetables, fruits, and rice. Surrounding Huwei are extensive farmlands, interspersed with smaller rural settlements, creating a distinct urban-rural gradient. While not directly adjacent to major industrial belts like those found further north in Taiwan, the regional concentration of manufacturing and processing facilities contributes to background pollution levels. Proximity to the Taiwan Strait offers some degree of coastal breezes, but these are often insufficient to fully clear pollutants, especially during temperature inversions. The city’s location within a relatively sheltered basin, bounded by hills to the east, exacerbates the trapping of airborne particles and gases, impacting local air quality. The interplay between agricultural practices, regional industry, and the local topography defines Huwei’s unique environmental challenges.

Huwei’s air quality follows a distinct seasonal pattern, heavily influenced by Taiwan’s subtropical monsoon climate. Spring (March-May) often sees a rise in particulate matter due to agricultural burning practices preparing fields for planting, coupled with decreasing rainfall. Summer (June-August) brings the southwest monsoon, offering periods of improved air quality through increased wind speeds and rainfall washing away pollutants. However, high humidity can also foster the formation of secondary pollutants like ozone. Autumn (September-November) is typically the most favourable season, with clearer skies and stable weather patterns, though occasional cold fronts can temporarily increase pollution. Winter (December-February) presents the most challenging conditions. The northeast monsoon prevails, bringing cooler, drier air and often causing temperature inversions. These inversions trap pollutants near the ground, leading to stagnant air and increased concentrations of particulate matter and nitrogen oxides. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during winter mornings. Fog, common during winter, further exacerbates pollution by trapping particles. Months to avoid prolonged outdoor exposure are December, January, and February. Monitoring wind direction and avoiding activity near agricultural areas during spring burning are also advisable.