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Niono, situated in the Ségou Region of Mali (coordinates 14.2500, -6.0000) and home to approximately 91,554 residents, occupies a strategically important position within the inland delta of the Niger River. The city’s geography is dominated by a gently undulating alluvial plain, characteristic of the broader Sahelian landscape. This terrain, formed by centuries of riverine deposition, results in fertile, albeit often seasonally waterlogged, soils. Niono’s location is crucial; it serves as a significant market town and transportation hub for the surrounding agricultural region, connecting rural communities to larger urban centres like Ségou and Bamako. The landscape surrounding Niono is primarily agricultural, a mosaic of cultivated fields – predominantly rice, maize, and sorghum – interspersed with savanna grasslands and scattered acacia trees. The Niger River, though not directly adjacent to the city, exerts a profound influence, shaping the local climate and contributing to the prevalence of seasonal flooding. There's a gradual urban–rural gradient extending outwards from Niono, transitioning from densely populated areas to more sparsely settled agricultural zones. While Niono itself lacks significant heavy industry, the transportation of agricultural goods and the presence of smaller-scale processing facilities (rice milling, for example) contribute to localized air quality considerations. The relatively flat terrain and prevailing wind patterns can lead to the accumulation of pollutants, particularly during periods of reduced wind speed and temperature inversions, impacting air quality within and around the city. The surrounding savanna, while providing some natural air filtration, can also contribute to particulate matter during the dry season due to vegetation fires.

Niono’s air quality is inextricably 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 significant air quality challenges. Reduced rainfall leads to drier vegetation, increasing the risk of agricultural burning for land clearing and crop residue disposal. These practices release substantial quantities of particulate matter (PM), including smoke and ash, which can linger due to frequent temperature inversions – a meteorological phenomenon where cooler air is trapped beneath a layer of warmer air, inhibiting vertical mixing. Wind speeds are often lower during this period, further exacerbating the accumulation of pollutants. The Harmattan wind, a dry and dusty trade wind blowing from the Sahara, can also transport significant amounts of dust and sand into the region, degrading air quality. The wet season, from June to October, brings relief as rainfall washes away accumulated pollutants and increased humidity helps to settle particulate matter. However, heavy rainfall can also lead to flooding, which can release mould spores and other allergens into the air. Fog, particularly in the early morning during the transition periods between seasons, can trap pollutants near the ground. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak burning periods and periods of reduced visibility. The months of February and March often experience the poorest air quality due to a combination of agricultural burning and the influence of the Harmattan. Conversely, July and August generally offer the best air quality, coinciding with the height of the rainy season.