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Kéniéran, situated in the Kankan region of Guinea at approximately 11.1167°N, -8.9333°W, is a town deeply embedded within the Guinean Highlands. The terrain is characterised by undulating hills and plateaus, a landscape sculpted by centuries of weathering and the influence of the Niger River basin, though Kéniéran itself isn’t directly on the river. The surrounding area is predominantly rural, dominated by agricultural lands – primarily subsistence farming of crops like coffee, cocoa, and bananas – and interspersed with patches of savanna woodland. This agricultural activity, while vital to the local economy, contributes to particulate matter pollution through land clearing and seasonal burning. Kéniéran’s elevation, around 400-500 meters, influences temperature and atmospheric circulation. The urban-rural gradient is quite sharp; Kéniéran represents a concentrated settlement within a largely agrarian landscape. Dust from unpaved roads and construction, coupled with the burning of biomass for cooking and heating, are significant localised pollution sources. The town’s position within a valley can also exacerbate pollution events, trapping emissions during periods of calm weather. The lack of significant industrial belts immediately adjacent to Kéniéran means that long-range transport of pollutants from other areas may play a role in air quality fluctuations, though this requires further investigation. The prevailing winds, influenced by the Harmattan and monsoon patterns, dictate the dispersion of these pollutants.

Kéniéran experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, roughly November to April, is typically the period of poorest air quality. Reduced rainfall means less atmospheric cleansing, and agricultural burning for land preparation is at its peak, releasing substantial smoke and particulate matter. Harmattan winds, originating from the Sahara, carry dust southward, further degrading air quality. January and February are often the most challenging months. The transition to the wet season, May to July, brings a gradual improvement as rainfall increases and washes away accumulated pollutants. However, increased humidity can also contribute to the formation of mould spores, potentially affecting respiratory health. The wet season, August to October, generally offers the best air quality, with frequent rainfall effectively scrubbing the atmosphere. However, stagnant air masses can occasionally develop, leading to localised pollution build-up, particularly in lower-lying areas. Temperature inversions, though less common than in temperate climates, can occur during the cooler nights of the dry season, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the dry season and be mindful of smoke from burning.