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Dahmani, nestled in the Kef Governorate of Tunisia at coordinates 35.9500°N, 8.8333°E, occupies a unique geographic position within the country’s northwest. The city is situated in the Dorsal Mountains, a region characterised by rolling hills and plateaus, with an elevation contributing to cooler temperatures than coastal areas. This mountainous terrain significantly influences local air quality, creating pockets where pollutants can become trapped, particularly during temperature inversions. The surrounding landscape is predominantly agricultural, with olive groves and cereal farming dominating the rural areas. While Dahmani isn’t a major industrial hub, smaller-scale agricultural processing and local crafts contribute to emissions. The urban-rural gradient is relatively sharp; the city itself is compact, quickly transitioning to open farmland. Proximity to larger urban centres like Kef (approximately 20km) means Dahmani can experience pollutant transport from those areas, especially during specific wind patterns. The lack of significant bodies of water nearby means limited evaporative cooling, potentially exacerbating summer heat and associated pollution. Dust from the surrounding drylands is a consistent factor, impacting particulate matter levels. The city’s location within a valley further concentrates air movement, influencing dispersion patterns.

Dahmani’s air quality follows a distinct seasonal pattern. Spring (March-May) sees a gradual improvement after the winter, but agricultural burning for land preparation can temporarily elevate particulate matter. Summer (June-August) brings hot, dry conditions and often stable air masses, leading to a build-up of pollutants from local sources and potential dust intrusion from the Sahara. August is typically the least favourable month for outdoor activity for those with respiratory sensitivities. Autumn (September-November) offers the clearest air, with cooler temperatures and increased rainfall washing away pollutants. However, the start of the heating season in November introduces emissions from wood and fossil fuel burning. Winter (December-February) is characterised by temperature inversions, trapping pollutants in the valley and leading to poorer air quality. Cold, still days are particularly problematic. Wind patterns, predominantly from the west, play a crucial role in dispersing or concentrating pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during periods of stagnant air and agricultural burning. Monitoring local conditions and heeding health advisories is vital.