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Binkolo, nestled in the Northern Province of Sierra Leone at approximately 8.9522° N, -11.9803° E, occupies a geographically significant position within the West African Sahel. The town’s terrain is predominantly undulating, characterized by gently sloping hills and valleys, typical of the transition zone between the forested south and the drier savanna north. Elevation ranges modestly, generally between 150 and 250 meters above sea level, influencing local air circulation patterns. Binkolo sits near the Rokel River, a vital waterway for the region, though its direct impact on air quality is limited due to the relatively small scale of the town. The surrounding landscape is a mosaic of small-scale agriculture – predominantly rice and maize farming – interspersed with patches of woodland and savanna. This agricultural activity, particularly during burning seasons, contributes to localized particulate matter. The urban–rural gradient around Binkolo is gradual; the town blends seamlessly into the agricultural landscape, with scattered rural settlements extending outwards. There are no major industrial belts immediately adjacent to Binkolo, however, the town serves as a regional market hub, leading to increased vehicular traffic and associated emissions. The prevailing winds, generally from the southwest during the wet season and northeast during the dry season, play a crucial role in dispersing or concentrating pollutants. The relatively flat topography and limited natural barriers can allow for the accumulation of pollutants, especially during periods of stagnant air. The Sahelian climate, with its distinct wet and dry seasons, significantly shapes the regional atmospheric conditions and, consequently, Binkolo’s air quality profile.

Binkolo’s air quality experiences a pronounced seasonal cycle dictated by its tropical climate. The wet season, typically spanning from May to October, brings increased rainfall and higher humidity, generally leading to improved air quality as precipitation washes away particulate matter. However, the onset of the wet season is often preceded by a period of intense dust storms originating from the Sahara, which can temporarily degrade air quality. The dry season, from November to April, presents a more complex picture. While rainfall is minimal, the lack of precipitation allows for the accumulation of pollutants, particularly those from agricultural burning practices. Farmers often burn crop residues to clear fields, releasing significant amounts of smoke and particulate matter into the atmosphere. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants near the ground, exacerbating the problem. Fog, though infrequent, can also contribute to stagnant air conditions and reduced visibility. The months of February and March are often the most challenging, coinciding with peak agricultural burning and the potential for temperature inversions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor activity and avoiding areas with visible smoke. During the wet season, while overall air quality is generally better, the risk of fungal spores and allergens increases, potentially affecting those with allergies or asthma. Maintaining good ventilation indoors and avoiding exposure to floodwaters are important health considerations throughout the year.