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Touna, nestled within the Ségou Region of Mali, occupies a geographically significant position at the edge of the Niger River floodplain. Located at approximately 13.1172° latitude and -5.8303° longitude, the town’s terrain is predominantly flat, characteristic of the Sahelian zone. The surrounding landscape is a mosaic of savanna grasslands, punctuated by riverine forests and agricultural fields, reflecting the region’s reliance on the Niger River for sustenance. Touna’s proximity to the river dictates much of its character; it serves as a vital transportation route and supports extensive alluvial farming, primarily of rice, sorghum, and maize. The urban footprint of Touna is relatively small, exhibiting a gradual urban-rural gradient as one moves outwards. The town itself is a modest settlement, with a population of around 20,238, and is surrounded by a wider agricultural zone. While Touna lacks significant heavy industry, the prevalence of traditional cooking methods using wood and charcoal, coupled with agricultural practices involving burning vegetation, contributes to localized air pollution. The flat topography and prevailing wind patterns can lead to stagnant air conditions, particularly during certain times of the year, hindering the dispersion of pollutants. The broader Ségou Region is experiencing increasing desertification, which can impact dust levels and further degrade air quality. The town’s location within a fertile floodplain also means it is susceptible to seasonal flooding, which can temporarily disrupt air quality monitoring and impact the spread of pollutants.

Touna’s air quality is intrinsically linked to its tropical savanna climate, exhibiting a distinct wet and dry season cycle. The dry season, typically spanning from November to May, presents the most challenging conditions. Reduced rainfall leads to drier vegetation, increasing the risk of bushfires, a significant source of particulate matter. The lack of precipitation also means less atmospheric cleansing, allowing dust and smoke to accumulate. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, exacerbating the problem. Wind speeds are generally lower during this period, further hindering dispersion. The months of January and February often experience the poorest air quality due to a combination of these factors. Conversely, the wet season (June to October) brings relief. Frequent rainfall washes pollutants from the atmosphere, and higher humidity can help suppress dust. However, agricultural burning, a common practice at the start of the planting season, can temporarily elevate pollution levels. The monsoon winds, while beneficial for cleansing, can also carry pollutants from distant sources. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during peak pollution periods, particularly in the mornings. During the wet season, while generally better, vigilance is still advised during periods of agricultural burning. Maintaining indoor air quality through proper ventilation and avoiding exposure to smoke from cooking fires is crucial year-round.