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Bousso, a town in the Chari-Baguirmi region of Chad, sits at approximately 10.4825°N latitude and 16.7161°E longitude. The town’s geography is defined by its location within the Sahelian zone, a transitional ecosystem between the Sahara Desert to the north and the Sudanian Savanna to the south. The terrain is generally flat, characteristic of the Chari River basin, with an elevation hovering around 280-300 meters above sea level. Bousso is situated relatively close to Lake Chad, though the lake’s shrinking size and fluctuating shoreline mean its direct influence is lessening. The surrounding landscape is predominantly agricultural, supporting subsistence farming of crops like sorghum, millet, and maize. This agricultural activity, while vital for the local economy, contributes to particulate matter pollution through land preparation, harvesting, and the burning of crop residue. The urban-rural gradient is quite sharp; Bousso itself is a relatively small settlement, quickly giving way to rural farmland and sparse vegetation. Dust from the Sahara, carried by prevailing winds, is a significant factor impacting air quality, particularly during the dry season. The lack of significant industrial activity within Bousso itself means that local pollution sources are primarily related to domestic fuel use (wood and charcoal) and agricultural practices. This makes Bousso’s air quality highly sensitive to regional climate patterns and land use changes.

Bousso experiences a distinct wet and dry season, dictating the patterns of air quality throughout the year. The dry season, roughly from November to May, is characterized by consistently poor air quality. Harmattan winds, originating from the Sahara, bring vast quantities of dust and sand, significantly increasing particulate matter concentrations. January to March are typically the worst months, with reduced visibility and increased respiratory issues. Temperature inversions, common during cooler nights in the dry season, trap pollutants near the ground, exacerbating the problem. The onset of the wet season in June brings a temporary improvement. Rainfall washes away dust and suppresses airborne particles, leading to clearer skies. However, increased humidity can also promote mold growth, potentially triggering allergic reactions. August and September, the peak of the rainy season, generally offer the best air quality. As the wet season wanes in October and November, agricultural activities intensify, with land clearing and burning contributing to localized smoke and particulate matter. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor exposure during the dry season and take precautions during agricultural burning periods. Monitoring wind direction and staying indoors on dusty days is crucial for protecting health.