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Suining is a prefecture-level city in eastern Sichuan Province, China, strategically positioned along the middle reaches of the Tuo River, a major tributary of the Yangtze River. Situated at approximately 30.5°N latitude and 105.6°E longitude, Suining lies within the Sichuan Basin's eastern periphery, characterized by rolling hills and low mountains that create a semi-enclosed topography. The city's elevation averages around 300 meters above sea level, with terrain sloping gently toward the river valleys. This basin location significantly influences air quality by limiting natural ventilation; pollutants from urban activities often become trapped under temperature inversions, particularly during calm winter months. Suining serves as a regional transportation hub connecting Chengdu to Chongqing, with its urban core blending industrial zones, residential areas, and commercial districts. The surrounding landscape transitions from dense urban development to agricultural lands producing rice, citrus, and vegetables, creating an urban–rural gradient where biomass burning occasionally contributes to particulate matter. Proximity to the Tuo River provides some moderating effects on local climate but does little to disperse accumulated pollutants. The city lies within Sichuan's industrial belt, with manufacturing and energy production adding to the general urban pollution sources. This geographic setting, combined with basin meteorology, makes Suining vulnerable to episodic air quality degradation despite its moderate population size.

Suining's air quality follows distinct seasonal patterns shaped by the East Asian monsoon and basin meteorology. In winter (December–February), pollution typically peaks due to increased coal burning for heating, stable atmospheric conditions, and frequent temperature inversions that trap pollutants near the surface. Cold, calm days with limited wind dispersal create the worst conditions, making outdoor activities inadvisable for sensitive groups like children, elderly, and those with respiratory conditions. Spring (March–May) brings gradual improvement as temperatures rise and precipitation increases, though occasional dust from northwestern China can elevate particulate levels. The summer monsoon (June–August) offers the cleanest air with frequent rainfall scrubbing pollutants from the atmosphere and southeasterly winds providing better ventilation; this is the optimal season for outdoor activities. Autumn (September–November) sees a transitional period where decreasing temperatures and reduced rainfall allow pollutants to accumulate again, particularly in November as heating season begins. Throughout the year, fog formation in the basin can exacerbate pollution visibility and health impacts. Sensitive residents should monitor daily air quality reports, use air purifiers during peak periods, and schedule outdoor exercise for midday when mixing is better. The seasonal shift from clean summer air to polluted winter conditions requires adaptive strategies for vulnerable populations.