Doukombo Air Quality Index (AQI)

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Doukombo, nestled within the Mopti Region of Mali, occupies a geographically significant position on the edge of the Sahel, a transitional zone between the Sahara Desert and the Sudanian Savanna. Located at approximately 14.35°N, 3.66°W, the town’s elevation averages around 220 meters above sea level, contributing to a relatively open landscape with limited topographic shielding. The surrounding terrain is predominantly characterized by gently undulating plains, punctuated by sparse acacia woodlands and seasonal watercourses. The Niger River, a vital artery for West Africa, flows approximately 50 kilometers to the east, influencing regional climate patterns and providing a source of water for agriculture. Doukombo’s urban character is that of a small market town, primarily serving the surrounding agricultural communities. The dominant land use is a mix of residential dwellings, small-scale commerce, and agricultural fields extending outwards in a gradual urban–rural gradient. While Doukombo itself lacks significant industrial zones, it sits within a broader agricultural belt focused on millet, sorghum, and maize cultivation. This agricultural activity, particularly during harvest seasons, contributes to localized particulate matter emissions from burning crop residues and dust generation from tilling. The prevailing winds, often originating from the north during the dry season, can transport dust and pollutants from the Sahara, impacting air quality. The relatively flat terrain and limited vegetation cover exacerbate dust dispersal, while the town’s small size restricts the formation of significant urban heat island effects, though localized heating from cooking fires can still occur. The proximity to the Sahel’s edge means the town is highly susceptible to desertification processes, further contributing to dust pollution.

Doukombo’s air quality experiences a distinct seasonal cycle dictated by the region’s tropical savanna climate. The dry season, spanning roughly from November to May, presents the most challenging conditions. Characterized by consistently high temperatures and minimal rainfall, this period is marked by increased dust intrusion from the Sahara Desert. Strong, northerly winds frequently carry fine particulate matter, significantly reducing visibility and impacting respiratory health. Temperature inversions, common during the cooler nights of December and January, can trap pollutants near the ground, exacerbating localized air quality issues. The months of February and March often see peak dust events, coinciding with the Harmattan wind, a dry and dusty trade wind. Conversely, the wet season, from June to October, brings a period of relative improvement. Rainfall effectively washes pollutants from the atmosphere, and increased vegetation cover helps to bind dust particles. However, the onset of the monsoon can also bring localized flooding, which can temporarily release pollutants from stagnant water sources. Cooking fires, a primary source of indoor and outdoor air pollution, are more prevalent during the cooler dry season. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during peak dust events and ensuring adequate ventilation indoors. The transition months of May and November present moderate air quality conditions, with a gradual shift in wind patterns and rainfall.