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Yangasso, nestled in the Ségou Region of Mali, occupies a geographically significant position within the Sahelian zone. Located at approximately 13.0775° latitude and -5.3203° longitude, the city’s terrain is predominantly characterized by gently undulating plains, part of the larger Niger River basin. The surrounding landscape is a mosaic of savanna grasslands, dotted with acacia trees and interspersed with agricultural fields – primarily cultivating cotton, sorghum, and maize. This proximity to intensive agricultural zones contributes to seasonal dust events and potential pesticide drift, impacting local air quality. Yangasso sits relatively low in elevation, averaging around 200 meters above sea level, which can exacerbate the trapping of pollutants, particularly during periods of atmospheric stability. The Niger River, though not immediately adjacent, exerts a regional influence, moderating temperatures and occasionally contributing to humidity, which can affect the dispersion of particulate matter. The urban–rural gradient around Yangasso is gradual, with small villages and agricultural plots blending seamlessly into the town’s periphery. There are no major industrial belts directly bordering Yangasso; however, regional transport routes pass nearby, contributing to vehicular emissions. The city’s location within the transition zone between the drier Sahel and Sudanian savannas means it experiences a distinct wet and dry season, profoundly influencing local weather patterns and, consequently, air quality dynamics. The relatively small population of 14,456 suggests a primarily agrarian economy, with limited large-scale industrial activity, though biomass burning from agricultural practices remains a key factor.

Yangasso’s air quality follows a predictable seasonal pattern dictated by its tropical savanna climate. The dry season, typically spanning from November to April, presents the most significant air quality challenges. Characterized by minimal rainfall and persistent sunshine, this period is prone to intense dust storms originating from the Sahara Desert and the Bodélé Depression, a major source of Saharan dust. These events dramatically increase particulate matter concentrations, reducing visibility and posing respiratory health risks. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, further worsening air quality. Conversely, the wet season (May to October) brings relief. The onset of the monsoon rains effectively ‘washes’ the atmosphere, removing accumulated dust and pollutants. Increased humidity also helps to bind particulate matter, reducing its airborne concentration. However, the wet season isn't entirely benign; biomass burning associated with agricultural practices – clearing land for planting and crop residue disposal – can generate significant smoke plumes, particularly in September and October. Fog, though infrequent, can occur during the transition periods, trapping pollutants and creating localized air quality issues. 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, smoke from agricultural burning warrants similar precautions, especially downwind of agricultural areas. The months of February and March often experience the highest dust concentrations, while July and August typically offer the cleanest air.