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Timbuktu, situated in the Tombouctou Region of Mali, occupies a precarious yet historically significant position on the southern edge of the Sahara Desert. Its coordinates (16.7735° N, 3.0074° W) place it within the Inner Niger Delta, a region shaped by the seasonal flooding of the Niger River. The city itself is built on a low alluvial plain, averaging only a few meters above sea level, surrounded by vast expanses of arid and semi-arid savanna. This flat terrain, combined with the prevailing Harmattan winds blowing from the northeast during the dry season, significantly influences air quality. The surrounding landscape is dominated by sand dunes, sparse vegetation, and traditional mud-brick architecture, characteristic of Sahelian urban environments. While the Niger River provides a vital water source and supports localized agriculture, its influence on air quality is primarily through humidity fluctuations rather than direct pollution. There are no major industrial belts nearby; the regional economy revolves around subsistence farming (millet, sorghum), livestock rearing, and limited trade. The urban–rural gradient is sharp, with the city acting as a hub for surrounding nomadic and semi-nomadic communities. Dust storms, originating from the Sahara, are a frequent occurrence, contributing significantly to particulate matter pollution. The lack of significant elevation and the flat topography exacerbate the accumulation of pollutants, as there is limited natural dispersion. The city’s vulnerability to desertification further contributes to the prevalence of dust and sand in the air.

Timbuktu’s air quality is inextricably linked to its distinct wet and dry seasons. The dry season, spanning roughly November to May, presents the most challenging conditions. The Harmattan wind, a persistent dry and dusty wind originating from the Sahara, dominates this period, carrying vast quantities of sand and dust particles across the region. This leads to consistently elevated levels of particulate matter, impacting respiratory health. Temperature inversions, common during the cooler nights of December and January, can trap pollutants close to the ground, further worsening air quality. The months of February and March often experience the most intense dust storms. Conversely, the wet season (June to October) brings a period of relative respite. The onset of the monsoon rains washes away accumulated dust and increases humidity, which can help to suppress dust lifting. However, agricultural practices, such as burning vegetation for land clearing, can temporarily elevate pollution levels. Fog, though infrequent, can also trap pollutants during the transitional periods. 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 storm periods. During the wet season, while generally better, agricultural burning warrants awareness. The intensity of the Harmattan wind and the frequency of dust storms are highly variable year to year, making accurate predictions difficult, but the dry season consistently poses the greatest air quality challenge.