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Guiré, nestled within the Koulikoro Region of Mali, occupies a geographically significant position on the edge of the Sahel, a transitional zone between the Sahara Desert and the Sudanian Savanna. Located at approximately 14.6433° latitude and -6.6908° longitude, the town’s terrain is predominantly characterized by gently undulating plains, typical of the inland Niger Delta region. The elevation is relatively low, averaging around 200 meters above sea level, contributing to a stable atmospheric layer that can, under certain conditions, trap pollutants. Guiré sits near the Niger River’s floodplain, although the immediate proximity is limited, influencing local humidity and potentially affecting particulate matter deposition. The surrounding landscape is a mosaic of agricultural fields – primarily millet, sorghum, and maize – interspersed with acacia woodlands and sparse grasslands. This agricultural activity, particularly during harvesting seasons, introduces significant biomass burning, a key contributor to local air pollution. The urban–rural gradient around Guiré is gradual; the town itself is a modest settlement, and the transition to rural agricultural land is seamless. There are no major industrial belts directly adjacent to Guiré, but regional trade routes pass through, potentially introducing vehicle emissions. The Sahelian climate, with its distinct wet and dry seasons, profoundly shapes the regional atmospheric dynamics and, consequently, the air quality experienced in Guiré. The flat topography and limited natural ventilation exacerbate the potential for pollutant accumulation, especially during periods of atmospheric stability.

Guiré’s air quality follows a predictable seasonal pattern dictated by its Sahelian climate. The dry season, spanning roughly from November to May, is typically characterized by lower humidity and increased wind speeds, which generally disperse pollutants. However, this period also sees a surge in biomass burning as farmers clear fields for planting and manage crop residue. The intensity of these burns, and the resulting smoke, significantly impacts air quality, particularly in February and March. Dust storms, common during this season, further degrade air quality, introducing fine particulate matter that can penetrate deep into the respiratory system. The onset of the monsoon season (June to October) brings increased rainfall, which helps to wash pollutants from the atmosphere, leading to a noticeable improvement in air quality. However, the increased humidity can also create conditions conducive to fog, especially in the mornings, trapping pollutants near the ground. Temperature inversions, though less frequent than in more temperate climates, can occasionally occur during the cooler months, further exacerbating pollution. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, particularly when biomass burning is prevalent. Limiting outdoor exertion during periods of heavy smoke or dust is advisable. The transitional months of May and November offer the most favourable conditions for outdoor activities, with a balance of rainfall and manageable pollutant levels.