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Sa Đéc is nestled within the fertile alluvial plains of the Mekong Delta in Đồng Tháp province, serving as a vital agricultural node. Its geography is defined by a low-lying, flat terrain characterized by an intricate network of canals and its proximity to the Tiền River. This aquatic landscape creates a humid microclimate where moisture often traps particulate matter close to the ground. The city is globally renowned for its flower villages, which introduce a unique urban-rural gradient where residential zones blend seamlessly into vast horticultural nurseries. This proximity to agricultural land significantly influences local air quality, as the burning of crop residues, particularly rice straw, releases seasonal plumes of organic aerosols. The city's regional position makes it a transit point for goods moving between the heart of the Delta and larger urban centers, increasing vehicular emissions along its primary arteries. Because the elevation is minimal, there are few natural barriers to wind, allowing regional pollutants to drift across the plains. However, the pervasive presence of water bodies provides a cooling effect and helps scrub some airborne particulates through deposition. The urban character is a blend of traditional riverside settlements and expanding commercial districts, creating a mosaic of land use that fluctuates between clean, green spaces and concentrated pockets of traffic-related pollution. This delicate balance between the lush, vegetative cover of the nurseries and the encroaching urbanization determines the daily fluctuations in the atmospheric composition. Thus, the city perfectly exemplifies how the agrarian legacies intersect with modern urban air dynamics.

Sa Đéc experiences a tropical climate divided into a distinct dry season and a wet season, which dictates the rhythmic ebb and flow of its air quality. During the dry season, spanning from November to April, the city often faces its most challenging atmospheric conditions. This period is marked by lower humidity and the prevalence of agricultural burning, as farmers clear rice straw for the next planting cycle. These biomass fires, combined with occasional morning temperature inversions, trap smoke and fine particulates near the surface, leading to hazy skies and diminished visibility. January and February are particularly critical months, where stagnant air can exacerbate respiratory distress for children and the elderly. Conversely, the wet season, from May to October, brings the rejuvenating southwest monsoon. Heavy rainfall acts as a natural scrubbing mechanism, washing pollutants from the atmosphere and significantly lowering particulate concentrations. The increased cloud cover and wind speeds during these months help disperse urban emissions, making this the ideal time for outdoor activities and ventilation. However, extreme humidity can sometimes lead to the formation of secondary pollutants. Sensitive groups, such as those with asthma, should remain vigilant during the peak burning windows of the dry season, utilizing indoor filtration or masks. In contrast, the rainy months offer a respiratory reprieve, though the dampness can trigger mold-related allergies. The seasonal transition periods are the most volatile, requiring residents to monitor local conditions closely to manage their health. Ultimately, the interplay of water and fire defines the city's breathable air.