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Ganzhu, nestled within Jiangxi Province in southeastern China, occupies a geographically complex position. Located at coordinates 26.9483° N, 116.3714° E, the city is situated in a hilly, inland region, part of the broader Luoxiao Mountains. The terrain is characterised by undulating landscapes and forested slopes, typical of the Jiangxi basin. Ganzhu’s elevation, while not extreme, contributes to localized weather patterns and pollutant dispersion. The city benefits from proximity to several smaller rivers and streams, tributaries of the Gan River, which provide water resources but also contribute to humidity and potential fog formation. Surrounding Ganzhu are significant agricultural zones, primarily rice paddies and tea plantations, alongside emerging light industrial areas focused on processing agricultural products and some manufacturing. The urban-rural gradient is relatively sharp; Ganzhu itself is a small city with a population of approximately 24,336, quickly transitioning to rural farmland and forested hills. This proximity to both agricultural activity and nascent industry, combined with the basin’s topography, creates conditions that can trap pollutants, particularly during periods of stagnant air. The surrounding mountains limit air circulation, influencing the concentration and dispersal of airborne particles and gases. This geographical setting is a key determinant of Ganzhu’s air quality profile.

Ganzhu experiences a humid subtropical climate, resulting in distinct wet and dry seasons that heavily influence air quality. Spring (March-May) sees increased rainfall, which initially helps to cleanse the air, but also elevates humidity, fostering mold growth and potentially trapping pollutants near the ground. Summer (June-August) brings the monsoon season, offering periods of improved air quality due to strong winds and precipitation washing away particulate matter. However, high temperatures and humidity can also promote the formation of ozone. Autumn (September-November) is generally considered the most pleasant time for air quality, with cooler temperatures, lower humidity, and relatively stable atmospheric conditions. This is the best period for outdoor activities. Winter (December-February) presents the most challenging conditions. Reduced rainfall, temperature inversions – common in the basin – and increased coal burning for heating contribute to pollutant build-up. Fog is also frequent, exacerbating particulate matter concentrations. Sensitive groups, including the elderly, children, and those with respiratory conditions, should limit outdoor exposure during winter months and periods of high humidity. Monitoring local weather reports and avoiding strenuous activity on poor air quality days is crucial. The transition periods between seasons often see fluctuating air quality, requiring vigilance.