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Liannong, a small state-level administrative division within the sprawling municipality of Shanghai, occupies a geographically strategic position in the eastern Yangtze River Delta. Located at approximately 31.01°N, 121.03°E, its terrain is predominantly flat, characteristic of the alluvial plains formed by the Yangtze and its tributaries. This flatness, while facilitating urban development, presents challenges for air quality dispersion. Liannong sits relatively close to the Hangzhou Bay, a significant body of water that can influence local weather patterns and, to a lesser extent, act as a sink for pollutants. The surrounding landscape is a complex mix of agricultural land – primarily rice paddies and vegetable farms – and increasingly, peri-urban industrial zones. Shanghai's broader industrial belt, concentrated further west and north, contributes significantly to regional pollution, with prevailing winds often carrying pollutants eastward towards Liannong. The urban–rural gradient is rapid; Liannong itself is a relatively low-density area transitioning from agricultural fields to residential and light industrial development. The lack of significant elevation changes hinders vertical mixing of air, exacerbating ground-level pollution episodes. The proximity to major transportation corridors, including highways and potentially rail lines, also contributes to localized pollution from vehicle emissions and industrial transport. The Yangtze River's influence, while providing a water source, can also lead to humidity and fog, which trap pollutants under certain meteorological conditions. The flat topography and surrounding agricultural and industrial landscape combine to create a setting where air quality is highly susceptible to regional pollution sources and weather patterns.

Liannong's air quality follows a distinct seasonal pattern dictated by Shanghai’s monsoon climate. Winter (December-February) consistently presents the most challenging conditions. Cold air masses dominate, leading to frequent temperature inversions – a layer of warm air trapping cooler air and pollutants near the ground. Reduced wind speeds during this period further limit dispersion, resulting in prolonged periods of elevated particulate matter. Fog, common in winter due to high humidity and low temperatures, compounds the problem by acting as a pollutant trap. Spring (March-May) brings a gradual improvement as temperatures rise and winds increase, though dust storms originating from northern China can occasionally impact air quality. Summer (June-August) is generally the most favourable season, with strong monsoon winds effectively flushing out pollutants. However, periods of intense heat can lead to stagnant air and ozone formation. Autumn (September-November) sees a transitional period, with decreasing temperatures and variable wind patterns. Early autumn can be particularly problematic as lingering winter conditions combine with the onset of agricultural burning in surrounding rural areas. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter and early spring, limiting outdoor activity during periods of poor visibility or noticeable odour. During summer, while generally cleaner, prolonged heat and humidity can still pose a risk, particularly for those with heart or lung problems. Staying hydrated and avoiding strenuous activity during peak heat is advisable. Throughout the year, monitoring local air quality reports and adjusting outdoor plans accordingly is recommended.