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Diafarabé, situated in the Mopti region of Mali at coordinates 14.1381, -5.0178, is a town deeply embedded within the Inland Niger Delta, a vast floodplain of the Niger River. The terrain is predominantly flat, characteristic of alluvial plains, with an elevation hovering around 200 meters. This low-lying geography significantly influences air quality, as dust and particulate matter are easily suspended and remain trapped during periods of calm weather. The town’s location within the delta means it’s intimately connected to the river’s seasonal fluctuations, impacting local humidity and vegetation. Surrounding Diafarabé are extensive agricultural lands, primarily focused on rice cultivation, which contribute to seasonal biomass burning for land preparation and post-harvest residue removal. This practice is a major source of localised air pollution. The urban-rural gradient is relatively blurred; Diafarabé functions as a market centre for surrounding villages, meaning transport – often by motorcycle and older vehicles – contributes to emissions. There are no significant industrial belts nearby, but the reliance on wood and charcoal for cooking and heating within the town itself is a constant source of indoor and outdoor air pollution. The delta’s complex hydrological system also influences the dispersion of pollutants, sometimes creating stagnant air pockets.

Diafarabé experiences a distinct wet and dry season, heavily influencing air quality. The dry season, roughly November to June, is when pollution peaks. Harmattan winds, originating from the Sahara, carry substantial amounts of dust southward, dramatically increasing particulate matter concentrations. January and February are typically the dustiest months, posing risks to respiratory health. Temperatures are high during this period, exacerbating the effects of pollutants. The transition to the wet season, around July, brings a temporary improvement as rainfall washes away dust and suppresses biomass burning. However, the wet season (July-October) isn’t entirely free of pollution. Increased humidity can promote fungal growth and mould spores, impacting air quality for allergy sufferers. Agricultural activities intensify during this period, with post-harvest burning still occurring, though less extensively than during the dry season. November sees a return to drier conditions and a gradual increase in pollution. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the peak dry season months and consider using masks when dust levels are high. Monitoring local conditions and avoiding strenuous activity on dusty days is crucial.