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Tianningcun, nestled within Zhejiang Province, China, occupies a geographically significant position within the Yangtze River Delta, a region renowned for its rapid urbanization and industrial development. Located at approximately 30.89°N, 120.80°E, the town sits on relatively flat terrain, characteristic of the alluvial plains formed by the Qiantang River. This river, a major tributary of the Yangtze, exerts a considerable influence on the local climate and landscape, providing a vital water source and shaping the surrounding agricultural lands. The urban fabric of Tianningcun is a blend of traditional Chinese architecture and modern development, reflecting the area’s evolving economic status. While primarily a residential area, it’s situated within a broader zone experiencing increasing industrial activity, particularly related to textiles and light manufacturing, contributing to localized pollution sources. The surrounding landscape is a mosaic of rice paddies, tea plantations, and small villages, illustrating a gradual urban–rural gradient. The proximity to Hangzhou, a major economic and cultural hub, means Tianningcun is subject to influences from a larger metropolitan area, including transportation patterns and air pollution transport. Elevation is relatively low, averaging around 10-20 meters above sea level, which can exacerbate the trapping of pollutants during periods of temperature inversion, especially during the cooler months. The lack of significant topographic barriers allows for the relatively easy dispersal of pollutants under favorable wind conditions, but also facilitates their accumulation when winds are light or reversed.

Tianningcun’s air quality follows a distinct seasonal pattern dictated by regional meteorology and prevailing wind systems. Winter (December-February) typically presents the most challenging conditions. Cold air masses frequently settle over the region, leading to temperature inversions where a layer of warm air traps cooler air and pollutants near the ground. Reduced wind speeds during this period further impede dispersion, resulting in periods of stagnant air and elevated particulate matter. Spring (March-May) brings a gradual improvement as temperatures rise and the East Asian monsoon begins to assert itself, introducing more frequent and stronger winds that help to clear pollutants. However, agricultural burning in surrounding rural areas can temporarily degrade air quality during this transition period. Summer (June-August) generally sees the best air quality, driven by consistent monsoon winds and higher temperatures that promote atmospheric mixing. Rainfall is also more frequent, washing pollutants from the air. Autumn (September-November) marks a transitional period, with decreasing monsoon influence and increasing frequency of fog, particularly in October and November. This fog, combined with cooler temperatures, can trap pollutants and lead to localized air quality deterioration. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter and autumn, limiting outdoor activity on days with visibly reduced visibility or noticeable odors. Maintaining indoor air quality through ventilation and air purification can also be beneficial during periods of poor air quality.