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Ipokia, situated in Ogun State, Nigeria, at coordinates 6.5333°N, 2.8500°E, is a town deeply embedded within the Dahomey Gap, a region characterised by a transition between rainforest and savanna ecosystems. The terrain is generally undulating, with low hills and valleys typical of southwestern Nigeria. The city’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. Ipokia’s location is significantly influenced by its proximity to the border with Benin, fostering cross-border trade and movement, but also potentially impacting environmental regulations and monitoring. Surrounding Ipokia are extensive agricultural lands, primarily dedicated to cocoa, palm oil, and cassava cultivation. These agricultural practices, while vital to the local economy, contribute to particulate matter pollution through land preparation, burning of vegetation, and the use of agrochemicals. The urban-rural gradient is pronounced; Ipokia itself is a growing urban centre, but is immediately surrounded by rural farmland. The lack of substantial industrial belts *within* Ipokia itself doesn’t negate the impact of regional industrial activity and transport corridors. The city’s air quality is further affected by dust from unpaved roads, particularly during the dry season, and the prevalent use of generators due to inconsistent electricity supply. The limited natural ventilation due to the surrounding topography exacerbates these issues.

Ipokia experiences a distinct tropical climate with alternating wet and dry seasons, profoundly influencing air quality. The dry season, typically from November to March, sees a significant increase in particulate matter pollution. Harmattan winds, originating from the Sahara Desert, carry substantial dust southward, impacting visibility and respiratory health. This period is also marked by increased burning of vegetation for agricultural purposes and waste disposal, further degrading air quality. February and March are generally the months with the poorest air quality. The transition period, April to May, brings increased humidity and sporadic rainfall, offering temporary relief. The wet season, from June to October, generally offers the best air quality due to rainfall scavenging pollutants from the atmosphere. However, increased humidity can also promote the growth of mold and mildew, impacting indoor air quality. September and October, while wet, can experience localised flooding which stirs up sediment and organic matter, potentially increasing biological pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the peak of the dry season and take precautions during periods of heavy rainfall. Consistent generator use throughout the year contributes a baseline level of pollution.