Koulikoro Air Quality Index (AQI)

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Koulikoro, a small city nestled in the Koulikoro Region of Mali, occupies a strategically significant position at the confluence of the Niger and Bani Rivers. Its coordinates, 12.8833° N, -7.55° W, place it within the Sahelian zone, a transitional ecoregion between the Sahara Desert and the Sudanian Savanna. The city’s terrain is predominantly flat, characteristic of the riverine plains, with gentle slopes leading towards the surrounding savanna landscape. This flatness, while facilitating urban development, can also exacerbate air quality issues as it limits natural dispersion of pollutants. Koulikoro’s location is crucial; it serves as a vital transportation hub, connecting northern and southern Mali, and facilitating trade along the Niger River. The surrounding landscape is dominated by grasslands and sparse vegetation, typical of the Sahel, with agricultural zones extending along the riverbanks, primarily cultivating millet, sorghum, and maize. The urban–rural gradient is relatively sharp, with the city transitioning quickly into agricultural land and then into the wider savanna. While Koulikoro itself lacks extensive heavy industry, its role as a trading center means vehicular traffic contributes to local air pollution. The proximity to agricultural lands also introduces particulate matter from soil erosion and agricultural burning, particularly during the dry season. The riverine environment, while providing a crucial water source, can also contribute to humidity, potentially affecting the behaviour of certain pollutants. The relatively low elevation (around 200 meters above sea level) doesn't significantly influence regional air flow patterns, but the flat topography does limit vertical mixing.

Koulikoro experiences a distinct wet and dry season, profoundly impacting its air quality. The dry season, typically spanning November to May, is characterized by intense solar radiation, low humidity, and frequent dust storms originating from the Sahara and the Bodélé Depression. These events dramatically increase particulate matter concentrations, posing a significant respiratory health risk. Wind patterns during this period are variable, sometimes bringing in clean air from the north, but more often transporting dust and sand across vast distances. Temperature inversions, though less frequent than in colder climates, can occasionally trap pollutants near the ground, particularly during calmer periods. The onset of the monsoon season (June to October) brings a shift in wind direction, often from the south-west, and increased rainfall. This rainfall helps to wash particulate matter from the atmosphere, leading to a noticeable improvement in air quality. However, the monsoon also brings increased humidity, which can exacerbate respiratory problems for some individuals. Agricultural burning, a common practice during the transition to the dry season (October/November), contributes to localized spikes in smoke and particulate pollution. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during dust storm events and avoiding areas with high vehicular traffic. The period immediately following rainfall can also see elevated levels of mold spores, impacting allergy sufferers. During the wet season, while overall air quality improves, vigilance regarding potential fungal allergens remains important.