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Tefam, nestled in the Ouest region of Cameroon (coordinates 5.2667, 10.4667), occupies a geographically significant position at the edge of the Adamawa Plateau, bordering Nigeria. The city’s terrain is characterized by undulating hills and valleys, typical of the transition zone between the forested southern regions and the drier Sahelian landscapes to the north. Tefam sits at a modest elevation, contributing to a generally warm climate, but also influencing local air circulation patterns. The surrounding landscape is a mosaic of small-scale agriculture – primarily subsistence farming of maize, cassava, and groundnuts – interspersed with savanna grasslands and patches of dense tropical forest. This agricultural activity, while vital for the local economy, can contribute to seasonal particulate matter pollution, particularly during burning seasons. The urban–rural gradient around Tefam is relatively sharp; the city itself is small, with a population of approximately 12,000, quickly giving way to rural agricultural lands. There are no major industrial belts immediately adjacent to Tefam, though occasional artisanal mining activities in the broader region could release localized pollutants. The proximity to the Nigeria border means that transboundary air pollution events, influenced by regional weather systems and industrial activity in neighboring areas, are a potential factor. The lack of significant water bodies within immediate proximity limits the natural cleansing effect of humidity on airborne pollutants, potentially exacerbating dry particulate matter issues. The topography creates localized microclimates, with valleys potentially trapping pollutants and hills influencing wind patterns.

Tefam experiences a distinct wet and dry season, profoundly impacting its air quality. The dry season, typically spanning from November to March, is characterized by lower humidity and increased wind speeds, which can initially disperse pollutants. However, this period also sees a significant rise in particulate matter due to agricultural burning practices – farmers clearing land for planting. The lack of rainfall during these months means there's minimal atmospheric cleansing, allowing these particles to linger. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants close to the ground, creating localized pockets of poor air quality. The wet season, from April to October, brings frequent rainfall, which naturally washes pollutants from the atmosphere, leading to a noticeable improvement in air quality. However, heavy rainfall can also lead to increased levels of mold and fungal spores, impacting respiratory health for sensitive individuals. Fog, though infrequent, can occur during the transition periods between seasons, trapping pollutants and reducing visibility. During the peak of the wet season, wind patterns tend to be more variable, sometimes bringing in moisture and pollutants from distant sources. Outdoor activities are generally best enjoyed during the wet season, particularly from June to September. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and avoiding areas with visible smoke.