Diéli Air Quality Index (AQI)

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Déli, situated in the Ségou Region of Mali, occupies a geographically significant position within the inland Niger Delta. Located at approximately 13.0667° N, -5.1167° W, the city’s terrain is predominantly flat, characteristic of the expansive floodplain landscape. The Niger River and its associated waterways are integral to Diéli’s existence, providing crucial irrigation for agriculture and influencing local microclimates. The surrounding landscape is dominated by fertile alluvial plains, supporting extensive rice paddies and other agricultural activities – a defining feature of the region. Diéli’s urban character is that of a small, rural market town, with a population of just over 12,000, exhibiting a gradual urban–rural gradient as one moves outwards. The city’s proximity to the Niger River means humidity levels are generally high, impacting atmospheric stability and potentially trapping pollutants. While Diéli isn't directly adjacent to major industrial belts, the agricultural zone surrounding it contributes to air quality through biomass burning during land clearing and crop residue disposal. The relatively flat topography limits vertical mixing of air, which can exacerbate localized pollution events. The Sahelian climate, with its distinct wet and dry seasons, further shapes the regional air quality dynamics, influencing the dispersion and concentration of particulate matter and gaseous pollutants. The elevation is low, contributing to a stable atmospheric boundary layer, particularly during the dry season.

Déli’s air quality experiences a pronounced seasonal cycle dictated by the region’s tropical savanna climate. The wet season, typically spanning from June to September, brings relief from dust and particulate matter as rainfall washes pollutants from the atmosphere and increases humidity, promoting atmospheric cleansing. However, the increased agricultural activity during this period, particularly rice cultivation, can lead to localized emissions from fertilizer use and, crucially, from the burning of agricultural waste to clear fields. This practice, while traditional, contributes to short-term spikes in smoke and particulate pollution. The dry season, from October to May, presents a more challenging air quality scenario. Lower rainfall, coupled with higher temperatures, leads to drier conditions and increased dust resuspension from the surrounding agricultural lands. Temperature inversions, common during the cooler months (November-February), trap pollutants near the ground, potentially leading to stagnant air and elevated concentrations of particulate matter. Fog, which can form during the cooler mornings, further restricts vertical mixing. The months of January and February are generally the most unfavorable for outdoor activity, particularly for vulnerable populations like children and the elderly, who should limit prolonged exposure. During the transition months (May and October), air quality tends to be more variable, influenced by shifting wind patterns and the onset or retreat of the monsoon. Maintaining good ventilation indoors and avoiding activities that generate dust are advisable throughout the year, but especially during the dry season.