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Pujehun, nestled in Sierra Leone’s Southern Province at coordinates 7.3506, -11.7181, is a town deeply interwoven with its surrounding environment. The terrain is predominantly lowland rainforest, part of the Gola Rainforest National Park’s periphery, influencing local air quality significantly. Situated approximately 30km inland from the Atlantic coast, Pujehun doesn’t experience direct marine influences on its air, but humidity remains consistently high. The town’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. Pujehun functions as a crucial market and agricultural hub for the surrounding rural communities, with a strong reliance on subsistence farming – primarily rice, cassava, and palm oil production. This agricultural activity, while vital to the local economy, introduces particulate matter from land clearing, burning of agricultural waste, and dust from unpaved roads. The urban-rural gradient is pronounced; Pujehun itself is a relatively small settlement, but is surrounded by dispersed villages and farmland. Limited industrial activity exists within Pujehun itself, but regional palm oil processing and small-scale mining operations further afield can contribute to background pollution levels, transported by prevailing winds. The Moa River, a significant waterway, flows nearby, but its impact on local air quality is primarily through humidity and evaporation rather than direct pollutant transport.

Pujehun experiences a distinct tropical climate characterized by a prolonged wet season (roughly May to November) and a shorter dry season (December to April). Air quality generally improves during the wet season as rainfall effectively washes particulate matter from the atmosphere. However, high humidity can also trap pollutants near the ground. The peak of the wet season, particularly August and September, sees increased fungal spores and mold, potentially exacerbating respiratory issues. The dry season, conversely, brings increased dust and smoke from agricultural burning as farmers prepare fields for the next planting cycle. Harmattan winds, originating from the Sahara, can transport significant amounts of dust southward, impacting visibility and air quality, particularly between December and February. Temperature inversions, though less frequent than in temperate climates, can occur during the cooler nights of the dry season, trapping pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the peak of the dry season (February-March) and periods of Harmattan dust. Monitoring local conditions and staying indoors when visibility is reduced is advisable. The transition months (April/May and November/December) offer the most favourable conditions for outdoor activity.