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Fourou, situated in the Sikasso region of Mali, is a town deeply embedded within the Sudanese savanna ecosystem. Located at approximately 10.74°N latitude and 6.14°W longitude, the terrain is generally flat to gently undulating, characteristic of the broader Sahelian zone. The town’s elevation is relatively low, contributing to limited natural dispersion of pollutants. Fourou isn’t proximate to any major bodies of water; however, seasonal streams and small ponds punctuate the landscape, drying up during the prolonged dry season. The surrounding area is predominantly agricultural, with millet, sorghum, and cotton being key crops. This agricultural activity, while vital to the local economy, contributes to particulate matter pollution through land preparation, harvesting, and the burning of residual biomass. The urban-rural gradient is fairly sharp; Fourou itself is a relatively compact settlement, quickly giving way to agricultural fields and sparsely vegetated savanna. Dust from these fields, exacerbated by wind erosion, is a significant contributor to air pollution. The lack of substantial industrial development within Fourou itself means that the primary pollution sources are localized to domestic fuel burning (wood and charcoal) and agricultural practices. The town’s position within a broad, flat plain limits the effectiveness of natural ventilation, potentially trapping pollutants during periods of calm weather.

Fourou experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, spanning roughly November to May, is characterized by consistently high temperatures and low humidity. This period sees a peak in particulate matter pollution. Harmattan winds, originating from the Sahara Desert, carry substantial amounts of dust southward, significantly degrading air quality. January to March are particularly challenging months, with reduced visibility and increased respiratory irritation. The wet season, from June to October, brings relief. Rainfall suppresses dust and washes pollutants from the atmosphere, leading to improved air quality. However, increased humidity can also promote mold growth indoors, impacting respiratory health. August and September, the peak of the rainy season, generally offer the best air quality. Temperature inversions, though less frequent than in temperate climates, can occur during the cooler nights of the dry season, trapping pollutants near ground level. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the Harmattan season and take precautions to protect their respiratory systems. Monitoring local weather patterns is crucial for anticipating pollution episodes.