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Jinzecun, nestled within the sprawling municipality of Shanghai, China, occupies a geographically significant position in the Yangtze River Delta. Located at approximately 31.0397° N, 120.9164° E, the area exhibits a relatively flat terrain, characteristic of the delta region, with elevations rarely exceeding 10 meters above sea level. This low-lying geography contributes to challenges in air dispersion, particularly during periods of stagnant weather. Jinzecun’s proximity to the Yangtze River, while providing a vital transportation artery and water source, can also influence local air quality through the advection of pollutants from upstream industrial zones. The surrounding landscape is a complex mix of urban development, agricultural land, and pockets of remaining rural character, reflecting Shanghai’s rapid urbanization. The urban–rural gradient is noticeable, with Jinzecun experiencing a transition from denser urban fabrics towards more agricultural fields further out. The city’s regional position within the heavily industrialized Yangtze River Delta places it downwind from major industrial belts concentrated in provinces like Jiangsu and Zhejiang. These areas contribute significantly to regional haze and transboundary pollution events. The delta’s extensive network of waterways and flat topography often exacerbate the effects of temperature inversions, trapping pollutants close to the ground. Furthermore, the presence of extensive agricultural zones surrounding Jinzecun, while supporting food production, can also contribute to air pollution through the release of ammonia and particulate matter from fertilizer use and agricultural burning, particularly during harvest seasons. The overall geography presents a complex interplay of factors impacting Jinzecun’s air quality.

Jinzecun’s air quality experiences a distinct seasonal cycle heavily influenced by regional weather patterns. Winter (December-February) typically presents the most challenging conditions. Cold air masses frequently settle over the region, leading to temperature inversions – a layer of warm air trapping cooler air and pollutants near the ground. Combined with reduced sunlight hours and limited wind speeds, this results in prolonged 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 strengthen, dispersing pollutants. However, dust storms originating from the Gobi Desert can occasionally impact air quality during this period. Summer (June-August) is generally the most favourable season, with strong monsoon winds and frequent rainfall effectively flushing out pollutants. High temperatures and humidity, however, can still contribute to the formation of ground-level ozone. Autumn (September-November) sees a transitional period. Initially, air quality remains relatively good, but as temperatures cool and the monsoon weakens, conditions become more prone to stagnation, with a gradual return of winter-like pollution patterns. October and November are often particularly susceptible to hazy conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor activity during periods of poor visibility. During spring, monitor air quality forecasts for dust storm warnings. Summer’s humidity can exacerbate respiratory issues for some, while autumn’s transitional period requires vigilance regarding potential pollution spikes.