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Zégoua sits within the fertile Sikasso region of southern Mali, serving as a vital node in an agricultural heartland characterized by a transitional Sudano-Sahelian landscape. The terrain is predominantly a gently undulating plateau, where the lushness of the southern savannah meets the encroaching dryness of the Sahel. Unlike the arid north, Zégoua benefits from higher annual precipitation, which supports an intensive agricultural belt specializing in cotton, maize, and mangoes. This agrarian character defines the urban-rural gradient, as the city is tightly interwoven with surrounding farmland. From an air quality perspective, this geography creates a complex interplay of pollutants. The lack of significant topographic barriers allows for the unimpeded movement of air masses, but the high density of biomass usage for cooking and heating in the urban core creates localized smog. Furthermore, the expansive agricultural zones surrounding the city contribute significantly to atmospheric particulate matter through seasonal field burning. The soil, rich and loamy, becomes highly susceptible to wind erosion during the dry months, contributing to a baseline of mineral dust. While the region lacks heavy industrial belts, the concentration of livestock and the reliance on charcoal-based energy sources ensure that the air quality is heavily influenced by organic aerosols and carbonaceous particles. Positioned far from the cooling influence of the ocean, Zégoua experiences continental temperature extremes that often trap pollutants near the surface during the cooler nocturnal periods of the year, exacerbating the localized impact of emissions.

The air quality in Zégoua is dictated by a binary seasonal rhythm: the oppressive dry season and the rejuvenating wet season. From November to May, the region falls under the influence of the Harmattan, a northeasterly trade wind that transports vast quantities of mineral dust from the Sahara. This period marks the peak of particulate matter, as the air becomes thick with fine silts, often reducing visibility and triggering respiratory distress. Temperature inversions are common during these cooler winter months, trapping smoke from domestic biomass fires and agricultural clearing close to the ground. Consequently, January and February are the most hazardous months for outdoor activity. Conversely, the arrival of the West African Monsoon from June to October brings heavy rains that effectively scrub the atmosphere. This "wet deposition" washes particulates from the air, leading to the cleanest air quality of the year. However, the transition periods, particularly the onset of the rains, can see spikes in pollution as farmers engage in slash-and-burn practices to prepare the soil. For sensitive groups, including children and the elderly, the Harmattan season requires strict precautions, such as wearing protective masks and limiting exertion during dust storms. Health guidance emphasizes staying indoors during the peak dust hours of the early morning. By favoring the rainy season for outdoor labor and recreation, residents can avoid the highest concentrations of airborne irritants that characterize the dry, dusty, and oppressive Sahelian winter.