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Sotouboua, nestled in Togo’s Centrale region at coordinates 8.5667°N, 0.9833°E, is a town characterized by a relatively flat topography typical of the coastal plains of southern Togo. The surrounding landscape is predominantly agricultural, with significant cultivation of cocoa, coffee, and food crops. This agricultural intensity, while vital to the local economy, contributes to seasonal particulate matter from land preparation and post-harvest burning. Sotouboua’s proximity to the Togo-Benin border influences regional air circulation patterns. The town isn’t directly on the coast, but is close enough to experience the moderating influence of the Gulf of Guinea, leading to high humidity levels. The urban-rural gradient is quite sharp; Sotouboua itself is a relatively small settlement, quickly transitioning to rural farmland. While not a major industrial hub, the increasing presence of small-scale processing facilities for agricultural products, alongside residential wood-burning for cooking, are emerging sources of localised pollution. The terrain’s flatness limits natural dispersion of pollutants, potentially exacerbating air quality issues during calm weather conditions. Dust from unpaved roads also contributes to particulate matter, particularly during the dry season. Understanding these geographical factors is crucial for assessing and mitigating air pollution in Sotouboua.

Sotouboua experiences a distinct tropical climate with a pronounced wet and dry season cycle, heavily influencing air quality. The dry season, typically from November to March, sees a peak in particulate matter. Reduced rainfall means less atmospheric cleansing, and agricultural burning for land preparation is common. Harmattan winds, originating from the Sahara, can transport dust plumes southward, further degrading air quality. February and March are generally the months with the poorest air quality. The transition period, April-May, brings increased humidity and sporadic rainfall, offering some improvement. The wet season, from June to October, generally offers the best air quality. Frequent rainfall effectively washes pollutants from the atmosphere. However, increased humidity can also foster mold growth, impacting respiratory health. September and October, while wet, can experience localised flooding which stirs up sediment and organic matter, potentially increasing biological pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during the dry season and be mindful of mold exposure during the wet season. Monitoring wind direction is key; winds from the north during the dry season are likely to carry Saharan dust.