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Zhongliao Township, nestled within Nantou County in central Taiwan, presents a unique geographic setting that significantly influences its air quality. Situated at coordinates 23.9039°N, 120.7819°E, the township occupies a basin-like terrain characteristic of the region, surrounded by the rolling hills and peaks of the Central Mountain Range. This topography, while visually appealing, creates a natural bowl effect, potentially trapping pollutants and hindering their dispersion. The elevation, averaging around 550 meters, contributes to cooler temperatures and increased humidity compared to coastal areas. While not directly adjacent to the ocean, Zhongliao benefits from the moderating influence of the Taiwan Strait, though this is lessened by the mountainous barrier. The surrounding landscape is predominantly agricultural, with tea plantations and fruit orchards dominating the lower slopes, transitioning to forested areas at higher elevations. A gradual urban-rural gradient exists, with the township center exhibiting denser development and associated emissions, while the periphery remains largely rural. The proximity to larger industrial zones in nearby cities like Taichung, coupled with agricultural practices involving pesticide use and biomass burning, introduces potential sources of air pollution that can impact Zhongliao’s air quality, particularly during periods of stagnant weather.

Zhongliao’s air quality follows a distinct seasonal pattern dictated by Taiwan’s subtropical monsoon climate. Spring (March-May) often sees increased particulate matter from agricultural burning as farmers prepare fields, coupled with fluctuating humidity that can trap pollutants. Summer (June-August) brings the southwest monsoon, offering periods of cleaner air due to prevailing winds dispersing emissions, though high humidity can still contribute to secondary pollutant formation. However, typhoons, common during this season, can disrupt air flow and temporarily worsen conditions. Autumn (September-November) is generally considered the most favourable period for air quality, with drier conditions and stable weather patterns promoting dispersion. This is the best time for outdoor activities. Winter (December-February) presents the most challenging conditions. Northeast monsoon winds bring cooler, drier air, but also increase the likelihood of temperature inversions, trapping pollutants near the ground. Reduced sunlight hours limit photochemical reactions that break down pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter months and periods of stagnant weather. Fog, common in the basin during winter, exacerbates particulate matter concentrations, impacting visibility and respiratory health.