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Minignan, nestled within the Denguélé region of Ivory Coast, occupies a geographically significant position at approximately 9.9974° latitude and -7.8359° longitude. The city’s terrain is characterized by gently undulating plains, typical of the Guinean Plateau, transitioning gradually into the drier savanna landscapes further north. Elevation is relatively modest, averaging around 250-300 meters above sea level, which influences local air circulation patterns. Surrounded by a mosaic of agricultural land – primarily cocoa and cashew plantations – and interspersed with scattered woodlands, Minignan exhibits a clear urban-rural gradient. The proximity to these agricultural zones introduces potential sources of particulate matter, particularly during harvesting and processing seasons. While not directly adjacent to major rivers, the region benefits from seasonal rainfall, contributing to humidity levels that can affect pollutant dispersion. The Denguélé region, as a whole, is not a major industrial hub; however, localized artisanal mining activities and small-scale processing facilities within and around Minignan can contribute to localized air pollution. The prevailing winds, generally from the south-east during the wet season and shifting north-west during the dry season, play a crucial role in transporting pollutants, impacting air quality both within the city and in surrounding rural communities. The relatively low population density (14,521) suggests a less concentrated urban footprint, but the reliance on biomass for cooking and heating in some households remains a factor influencing local air quality.

Minignan’s tropical climate dictates a distinct wet and dry season cycle, profoundly impacting its air quality. The wet season, typically spanning from April to October, brings frequent rainfall and higher humidity. While rainfall naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can trap pollutants closer to the ground, particularly during periods of reduced wind. The dry season, from November to March, is characterized by lower rainfall, higher temperatures, and often, calmer wind conditions. This combination can lead to a build-up of pollutants, especially during periods of stagnant air. Temperature inversions, where a layer of warm air sits above cooler air near the ground, are more common during the dry season, further trapping pollutants. Agricultural burning, a common practice for land clearing and crop residue disposal, significantly contributes to particulate matter pollution during the transition periods between seasons, particularly in late February and early March. The months of January and February often experience the poorest air quality due to the combination of dry conditions, temperature inversions, and agricultural practices. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor exertion and ensuring adequate ventilation. During the wetter months, while overall air quality may improve, the increased humidity can exacerbate respiratory issues for some individuals. Maintaining indoor air quality through proper ventilation and avoiding biomass fuel sources remains crucial throughout the year.