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Natitingou, nestled within the Atacora Department of Benin, occupies a unique geographic position in the country’s northwest. The city is situated on a plateau, approximately 380 meters above sea level, contributing to a relatively cooler climate compared to the coastal regions. This elevation, while offering respite from tropical heat, also influences air quality by potentially trapping pollutants during temperature inversions. The surrounding landscape is characterised by undulating hills and savannah woodlands, transitioning into more forested areas further north towards the Pendjari National Park. Natitingou isn’t directly adjacent to a major body of water, though smaller rivers and streams dissect the region, influencing local humidity. The urban-rural gradient is quite pronounced; the city centre is densely populated with traditional compounds and modern buildings, while the periphery quickly gives way to agricultural land – primarily subsistence farming of maize, yams, and cotton. While not a major industrial hub, Natitingou serves as a crucial market centre for the region, leading to increased vehicular traffic and dust from unpaved roads. The concentration of economic activity and population within a relatively confined plateau area exacerbates the potential for localised air pollution, particularly from transport and biomass burning for cooking and small-scale industry. The prevailing winds, generally from the southwest during the wet season, can transport pollutants across the city.

Natitingou experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, spanning roughly November to April, is characterised by hot, dry Harmattan winds blowing from the Sahara. These winds carry significant amounts of dust, dramatically increasing particulate matter concentrations and reducing visibility. February and March are typically the months with the poorest air quality, posing risks to respiratory health. The transition to the wet season in April-May brings temporary relief, as rainfall washes away accumulated dust. However, the onset of the rains also coincides with increased agricultural burning to clear fields for planting, leading to spikes in smoke and associated pollutants. The wet season (June-October) generally offers the best air quality, with frequent rainfall suppressing dust and diluting pollutants. However, high humidity can promote mould growth, potentially exacerbating allergies. November sees a gradual return to drier conditions and worsening air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the peak of the dry season and periods of agricultural burning. Monitoring wind direction is crucial, as pollutants can accumulate on the leeward side of the city.