Hengchun Air Quality Index (AQI)

Loading live AQI data...

Loading weather snapshot...

Loading historical AQI trends...

Hengchun, nestled in Pingtung County, Taiwan, occupies a unique and geographically significant position at the southern tip of the island. Its coordinates (22.0000, 120.7500) place it within a subtropical climate zone, heavily influenced by the Taiwan Strait and the South China Sea. The city’s terrain is predominantly low-lying, characterized by coastal plains and gently sloping hills, with an average elevation rarely exceeding 50 meters. This flat topography, combined with its coastal location, creates a funneling effect for winds, which can both disperse and concentrate pollutants. Hengchun is surrounded by a landscape of dramatic coastal cliffs, sandy beaches, and the Kenting National Park, a region known for its diverse ecosystems and recreational opportunities. To the west lies the Taiwan Strait, providing a pathway for maritime winds and potential transboundary pollution. Inland, the landscape transitions into agricultural zones, primarily focused on fruit cultivation and aquaculture, which can contribute to localized emissions. The urban–rural gradient around Hengchun is relatively gradual, with small villages and agricultural fields interspersed throughout the surrounding area. The city itself exhibits a compact urban character, largely shaped by its historical role as a military outpost and its current status as a popular tourist destination. The lack of significant industrial belts directly adjacent to Hengchun mitigates some pollution sources, but regional industrial activity further north can still impact air quality through long-range transport.

Hengchun’s air quality follows a distinct seasonal pattern dictated by its subtropical climate and prevailing weather systems. The wet season, typically spanning May to September, brings frequent rainfall and monsoonal winds from the southeast, generally leading to improved air quality as precipitation washes away particulate matter and winds disperse pollutants. However, typhoons, common during this period, can temporarily worsen air quality due to wind-driven dust and debris. The dry season, from October to April, presents a different challenge. Reduced rainfall and calmer winds, particularly during the winter months (December-February), often result in temperature inversions – a phenomenon where a layer of warm air traps cooler air near the ground, preventing vertical mixing and concentrating pollutants. Fog, common during these cooler months, further exacerbates this issue by reducing visibility and trapping emissions. Agricultural burning, though regulated, can also contribute to localized pollution spikes during this period. Spring (March-April) sees a gradual improvement as winds increase and temperatures rise. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry, cooler months, particularly when fog is present. Outdoor activities are generally more favorable during the wet season, although typhoon warnings should always be heeded. The transition months of May and October offer a balance of improved air quality and pleasant temperatures, making them ideal times for outdoor recreation.