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Mignouré, nestled within the Sassandra-Marahoué region of Ivory Coast at coordinates 7.4875, -6.7882, is a relatively small urban centre of approximately 14,025 inhabitants. The town’s geography is defined by its location within the transition zone between forested savanna and dense tropical rainforest, a landscape characterized by undulating terrain and fertile soils. Situated inland, Mignouré isn’t directly influenced by coastal breezes, but benefits from the moderating effects of the Sassandra River, though it’s not immediately adjacent. The surrounding area is predominantly agricultural, dominated by cocoa, coffee, and rubber plantations – key economic drivers for the region. This agricultural intensity contributes significantly to potential air quality concerns through the use of pesticides and fertilizers, as well as biomass burning for land clearing. The urban-rural gradient is sharp; Mignouré represents a concentrated point of activity within a largely rural expanse. While not a major industrial hub, small-scale processing of agricultural products occurs, adding to localised emissions. The terrain, while not mountainous, can create localised pockets where pollutants accumulate, particularly during periods of calm weather. Dust from unpaved roads is also a contributing factor to particulate matter in the air.

Mignouré experiences a distinct tropical climate with a pronounced wet and dry season, rather than traditional four seasons. Air quality is generally better during the wet season (roughly April to October) due to rainfall effectively scavenging pollutants from the atmosphere. However, increased humidity can also foster mold growth, impacting respiratory health. The dry season (November to March), known as the Harmattan period, brings Saharan dust southward on prevailing winds, significantly increasing particulate matter concentrations. This dust, combined with local biomass burning for agricultural purposes and domestic cooking, leads to the poorest air quality of the year. January and February are typically the months with the highest levels of airborne particles. Temperature inversions, common during the cooler, drier nights, trap pollutants near ground level, exacerbating the problem. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these periods. The transition months (March/April and October/November) can be unpredictable, with fluctuating air quality. Monitoring wind patterns is crucial; periods of calm wind will allow pollutants to build up, while stronger winds will disperse them.