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Sompui, nestled within the Tombouctou Region of Mali, occupies a precarious yet historically significant position on the southern edge of the Sahara Desert. Its coordinates (15.8436° N, -4.3256° W) place it within the Sahelian zone, a transitional landscape between the arid desert and the more humid savannas further south. The city’s terrain is predominantly flat, characterized by sandy plains and alluvial deposits from the Niger River, which, while not directly adjacent to Sompui, exerts a crucial influence on the regional climate and agricultural practices. The surrounding landscape is dominated by sparse vegetation – acacia trees and grasses – indicative of the semi-arid conditions. The urban fabric of Sompui is relatively small, reflecting its limited population of 16,590, and exhibits a traditional layout with mud-brick buildings clustered around a central market area. The urban-rural gradient is sharp; the city quickly transitions into the vast, sparsely populated expanse of the Sahel. Agriculture, primarily subsistence farming focused on millet and sorghum, is the dominant land use in the immediate vicinity, contributing to localized dust and particulate matter. There are no significant industrial belts near Sompui; its economy is largely based on trade and agriculture. The lack of substantial topographic variation, combined with the prevailing winds from the Sahara, facilitates the transport of dust and sand, significantly impacting air quality. The city’s isolation and dependence on traditional energy sources further compound these challenges, limiting opportunities for air quality improvement.

Sompui’s air quality is inextricably linked to its distinct wet and dry seasons, a characteristic of the Sahelian climate. The dry season, spanning roughly November to May, presents the most significant air quality challenges. During this period, strong, persistent Harmattan winds blow southward from the Sahara, carrying vast quantities of dust and sand. These winds, often exacerbated by land degradation and overgrazing in surrounding areas, create frequent and prolonged dust storms, dramatically reducing visibility and increasing particulate matter concentrations. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants near the ground, further worsening air quality. The months of January and February are typically the most problematic, with the highest frequency of dust events. Conversely, the wet season (June to October) brings a period of relative respite. Rainfall washes away accumulated dust, and increased humidity helps to settle particulate matter. However, the wet season isn't entirely free of air quality concerns; agricultural burning, a common practice for land clearing and crop residue disposal, can release significant amounts of smoke and pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during peak dust storm periods and wearing appropriate respiratory protection. During the wet season, while generally better, smoke from agricultural fires warrants similar precautions, particularly in areas downwind of burning activities. The intensity of the monsoon influences the frequency of rainfall and, consequently, the degree of air quality improvement.