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Kaelé, nestled in the Extrême-Nord region of Cameroon (10.1000° N, 14.4500° E), occupies a geographically significant position within the Mandara Mountains. This elevated terrain, averaging around 1,300 to 1,500 meters above sea level, profoundly influences the city’s microclimate and, consequently, its air quality. The surrounding landscape is dominated by rugged hills, steep slopes, and sparse vegetation, characteristic of a semi-arid environment. Kaelé sits on the edge of a transitional zone between the Sahelian and Sudanian biomes, impacting local agricultural practices. The city’s urban character is relatively small-scale, exhibiting a gradual urban-rural gradient as it expands outwards. While lacking major industrial belts within immediate proximity, Kaelé’s location near agricultural zones—primarily subsistence farming of millet, sorghum, and maize—introduces localized sources of particulate matter from crop residue burning, particularly during the dry season. The nearest significant water body is the Logone River, located some distance away, offering limited influence on local humidity and air circulation. The mountainous terrain creates a natural barrier, potentially trapping pollutants and fostering temperature inversions, especially during cooler months. The elevation contributes to lower temperatures compared to surrounding lowlands, but also increases the likelihood of fog formation, which can exacerbate air stagnation and pollutant accumulation. The city’s relatively isolated location, while offering some protection from broader regional pollution, also means that local emissions have a disproportionate impact on air quality.

Kaelé’s tropical savanna climate dictates a distinct wet and dry season cycle, significantly impacting air quality patterns. The dry season, typically spanning from November to April, presents the most challenging period. Reduced rainfall leads to lower atmospheric moisture, promoting the accumulation of particulate matter. Agricultural practices, specifically the burning of crop residue after harvest, become a major source of smoke and aerosols. Temperature inversions are more frequent during this period, trapping pollutants close to the ground, particularly in the mornings and evenings. The prevailing winds, often light and variable, offer limited dispersion of these emissions. The wet season, from May to October, brings increased rainfall and higher humidity, naturally cleansing the atmosphere and reducing particulate concentrations. However, intense rainfall events can occasionally lead to soil erosion and dust storms, temporarily elevating particulate levels. Fog, common during the cooler months of December and January, further restricts air movement and concentrates pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution hours (early morning and late afternoon). Periods of intense agricultural burning, typically in January and February, should be avoided entirely. The transition months (April/May and October/November) offer the most favourable conditions for outdoor activity, with moderate temperatures and improved air quality due to increased rainfall and wind.