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Sébékoro is situated in the Kayes region of western Mali, nestled within the semi-arid expanse of the Sahelian belt. The city is characterized by a predominantly flat, sandy terrain that reflects the broader geomorphology of the West African interior. Positioned far from the coast, its inland location makes it highly susceptible to the atmospheric dynamics of the Sahara Desert to the north. The urban character of Sébékoro is a blend of modest residential clusters and vibrant market areas, creating a distinct urban-rural gradient where the built environment gradually dissolves into vast agricultural zones. This surrounding landscape is primarily used for subsistence farming and livestock grazing, which introduces organic particulates into the air during land clearing. The proximity to the Senegal River basin, while providing essential water resources, also creates a localized humidity gradient that can trap pollutants during specific meteorological events. Elevation is relatively low and consistent, meaning there are no significant mountain barriers to obstruct the flow of regional winds. Consequently, air quality is heavily dictated by the transport of mineral dust from the north and the localized emissions from biomass combustion. The lack of heavy industrial belts means that the primary pollution drivers are natural dust events and domestic activities. This geographic openness ensures that while local pollutants disperse quickly, the city remains a corridor for large-scale atmospheric dust plumes, making the air quality inextricably linked to the broader Saharan climate system.

The air quality in Sébékoro follows a stark binary pattern dictated by the West African monsoon and the dry Harmattan winds. From November to March, the city enters the dry season, where the Harmattan—a cold, dry northeasterly trade wind—dominates. This period marks the peak of air pollution as the wind carries immense quantities of fine mineral dust from the Sahara, creating a persistent haze that reduces visibility and spikes particulate matter. During these months, temperature inversions often occur at night, trapping smoke from domestic charcoal fires near the ground, making early mornings particularly hazardous. Conversely, the wet season, spanning June to September, brings a dramatic improvement. Frequent rainfall acts as a natural scrubbing mechanism, washing particulates from the atmosphere and suppressing dust through soil moisture. October and May serve as transitional periods characterized by volatile wind shifts. For sensitive groups, including children and the elderly, the Harmattan months are the most critical; wearing protective masks and limiting outdoor exertion during dust storms is strongly advised. The peak heat of April and May can also exacerbate ground-level ozone formation. Therefore, the best window for outdoor activity is during the rainy season, when the air is freshest and the landscape is lush. Health guidance emphasizes hydration and respiratory protection during the dry peak to mitigate the effects of chronic dust inhalation, which can trigger asthma and other respiratory distress in the vulnerable population.