Toguéré-Koumbé Air Quality Index (AQI)

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Toguéré-Koumbé, situated in the Mopti region of Mali, is a vital inland port city strategically positioned on the Niger River at approximately 14.9169°N, -4.5947°E. The city’s geography is defined by its location within the Inner Niger Delta, a floodplain of immense ecological and economic importance. The terrain is generally flat, characteristic of alluvial plains, with an elevation hovering around 200 meters. This low-lying landscape contributes to limited natural air dispersion. The Niger River itself, while a source of life, also influences local humidity and can contribute to localised fog formation, trapping pollutants. Surrounding Toguéré-Koumbé are expanses of savannah and agricultural lands, primarily focused on rice cultivation and pastoral activities. The urban-rural gradient is relatively sharp, with the city acting as a central market and trading hub for surrounding rural communities. While not heavily industrialised, Toguéré-Koumbé experiences significant dust resuspension from unpaved roads and agricultural practices. The seasonal flooding of the Niger Delta, while essential for agriculture, can also mobilise sediments and organic matter, impacting air quality through increased particulate matter. The city’s position within the Sahel region makes it vulnerable to dust storms originating from the Sahara Desert, further exacerbating particulate pollution.

Toguéré-Koumbé experiences a distinct wet and dry season cycle that profoundly impacts air quality. The dry season, roughly from November to May, is characterised by hot, dry Harmattan winds blowing from the Sahara, bringing significant amounts of dust and sand. This period sees the highest levels of particulate matter, particularly PM10 and PM2.5, peaking between February and April. Avoiding strenuous outdoor activity during these months is advisable, especially for those with respiratory conditions. The onset of the wet season in June brings a temporary improvement in air quality as rainfall washes away dust and suppresses resuspension. However, increased humidity can also promote mould growth, potentially triggering allergic reactions. July to September sees the highest river levels, and while this doesn’t directly worsen air pollution, increased boat traffic and related activity can contribute to localised emissions. October offers a transitional period with generally improved conditions. Temperature inversions, common during cooler nights in the dry season, can trap pollutants near ground level, worsening air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory illnesses – should take extra precautions during the dry season and periods of Harmattan winds.