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Fatoma is situated within the heart of the Mopti region in Mali, a territory defined by the complex hydrography of the Inner Niger Delta. This geographic positioning places the settlement in a transitional zone between the arid Sahara to the north and the more humid Sudanese savannas to the south. The terrain is predominantly flat, characterized by vast alluvial plains and seasonal floodwaters that dictate the rhythm of local life. This low-lying topography creates a stagnant air environment during temperature inversions, trapping particulate matter near the ground. The urban character of Fatoma is inextricably linked to its agricultural surroundings, where the gradient between the built environment and the rural hinterland is nearly seamless. Air quality is heavily influenced by the surrounding landscape of scrubland and seasonal wetlands. During the dry phase, the lack of dense forest cover allows wind-blown mineral dust to dominate the atmosphere. Conversely, the proximity to the river provides a slight moderating effect on temperature but increases humidity, which can facilitate the formation of smog when combined with smoke from biomass burning. The absence of heavy industrial belts means that the primary pollutants are non-industrial, stemming instead from soil erosion and traditional farming practices. Positioned far from the coast, Fatoma experiences a continental climate where the atmosphere is frequently laden with fine Saharan sands, creating a challenging respiratory environment for its residents throughout the year. The local geography serves as a conduit for regional dust storms sweeping across the Sahelian belt.

The air quality narrative in Fatoma is governed by a binary seasonal cycle of extreme dryness and sudden inundation. From November to March, the region falls under the influence of the Harmattan, a northeasterly trade wind that transports massive quantities of mineral dust from the Sahara Desert. During these months, pollution peaks as PM10 levels soar, creating a persistent haze that reduces visibility and irritates the respiratory system. Temperature inversions are common during cool winter nights, pinning pollutants close to the surface. As the transition to the wet season begins around May, the atmosphere shifts. The arrival of the West African Monsoon brings torrential rains that effectively scrub the air of particulates, leading to the cleanest air of the year between July and September. However, this period also sees a rise in humidity, which can exacerbate the feeling of heaviness in the air. Between October and November, a critical window occurs where agricultural residue burning is common to prepare fields for the next cycle, causing short-term spikes in smoke and carbon monoxide. Sensitive groups, including children and the elderly, should limit outdoor exertion during the height of the Harmattan and the peak burning window. Health guidance emphasizes the use of protective face coverings during dust storms and staying indoors during the early morning hours when stagnant air traps biomass smoke, ensuring a safer respiratory experience during the most volatile months of the year.