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Koula, situated in the Koulikoro Region of Mali, lies approximately 60 kilometers northeast of the capital, Bamako. Geographically, Koula occupies a relatively flat terrain within the Sahelian zone, characterized by savanna grasslands and scattered trees. Its coordinates (13.1117, -7.6514) place it inland, away from major waterways, though it’s influenced by the Niger River’s broader climatic effects. The surrounding landscape is predominantly agricultural, with millet, sorghum, and cotton being key crops. This agricultural activity, while vital to the local economy, contributes to particulate matter pollution through land preparation, harvesting, and the burning of residual biomass. The urban-rural gradient is quite pronounced; Koula itself is a relatively small urban center, quickly transitioning to rural farmland. Dust from unpaved roads and fields is a significant factor. The lack of substantial industrial development within Koula itself means that localized industrial pollution is less of a concern than regional dust transport and agricultural practices. Elevation is relatively low, around 250-300 meters, which doesn’t create strong temperature inversions, but can allow for dust accumulation. The prevailing winds, influenced by the Harmattan from the Sahara, carry dust southward, impacting air quality, particularly during the dry season.

Koula experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, roughly November to May, is characterized by consistently poor air quality. The Harmattan winds, laden with Saharan dust, dominate, significantly increasing particulate matter concentrations. Reduced rainfall means less atmospheric cleansing, and agricultural burning for land preparation further exacerbates the problem. January to March are typically the worst months for respiratory health. The transition to the wet season (June-August) brings a dramatic improvement. Rainfall washes away dust and suppresses agricultural burning. However, even during the wet season, localized dust from unpaved roads remains a concern. September and October see a gradual return to drier conditions and increasing dust levels. Temperature inversions, though not frequent, can trap pollutants near the ground during cooler nights in the dry season. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during peak dust periods in the dry season and consider using masks. Monitoring wind direction is crucial; winds from the northeast indicate high dust levels. The wet season offers the most favourable conditions for outdoor activity.