Diéramana Air Quality Index (AQI)

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Diéramana, a town within the Ségou Region of Mali, is situated at approximately 12.8517°N latitude and 5.4003°W longitude. Its location is deeply intertwined with the Niger River, which flows nearby and profoundly influences the local environment. The terrain is generally flat, characteristic of the Inner Niger Delta, a floodplain that experiences significant seasonal inundation. This flatness contributes to limited natural air dispersion. Diéramana’s urban character is evolving, transitioning from a primarily agricultural community to a small urban centre serving surrounding villages. The surrounding landscape is dominated by savanna woodland and agricultural fields, primarily rice paddies and millet cultivation. The urban-rural gradient is relatively sharp, with agricultural land immediately bordering the town. Dust from agricultural activities, particularly during the dry season, is a significant factor. While Diéramana itself lacks heavy industry, regional transport routes pass through Ségou, potentially contributing to emissions. The proximity to the Niger River offers some limited cooling effect, but also creates conditions for humidity and potential fog formation, which can trap pollutants. The town’s elevation is low, further reducing atmospheric mixing and exacerbating pollution concentration during stagnant weather conditions. Understanding this geographic context is crucial for assessing and mitigating air quality challenges.

Diéramana experiences a distinct wet and dry season, heavily influencing air quality. The dry season, roughly November to May, is characterized by consistently high temperatures and low humidity. This period sees a significant increase in particulate matter pollution, primarily due to dust resuspension from agricultural activities, unpaved roads, and wind erosion. Harmattan winds, originating from the Sahara, exacerbate this issue, carrying large quantities of dust southward. January to March are typically the months with the poorest air quality. The transition to the wet season, June to July, brings a temporary improvement as rainfall suppresses dust. However, increased humidity can also lead to the formation of mold and fungal spores, impacting respiratory health. The peak of the wet season, August to October, generally offers the best air quality due to rainfall cleansing the atmosphere. However, stagnant air and localized flooding can create pockets of poor air quality. During the wet season, increased biomass burning for agricultural purposes can also contribute to localized smoke pollution. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit outdoor exposure during the dry season and be mindful of smoke during agricultural burning.