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Oke-Mesi, nestled within the Ekiti State of Nigeria, occupies a geographically significant position in the southwest of the country. Located at approximately 7.8167° latitude and 4.9167° longitude, the town sits on a gently undulating plateau, characteristic of the broader Yoruba highlands. The surrounding landscape is predominantly rural, a mosaic of small-scale agricultural plots, interspersed with cocoa plantations – a vital economic driver for the region – and interspersed with patches of secondary forest. Elevation plays a crucial role; Oke-Mesi rests at an altitude of roughly 550-650 meters above sea level, influencing local weather patterns and potentially affecting the dispersion of pollutants. The town’s proximity to larger urban centers like Ado-Ekiti, while not immediate, means it experiences some degree of indirect influence from their activities. The urban–rural gradient is relatively sharp; Oke-Mesi itself maintains a largely agrarian character, with a developing commercial center, but the surrounding areas are overwhelmingly rural. The lack of significant industrial activity within the immediate vicinity is a positive factor for air quality, however, agricultural burning during land preparation, particularly during the dry season, represents a localized source of particulate matter. The terrain, with its gentle slopes, can sometimes lead to localized pooling of cooler air, potentially contributing to temperature inversions under specific meteorological conditions, which can trap pollutants closer to the ground. The absence of major rivers or lakes within the town limits means there's limited natural scrubbing of the atmosphere.

Oke-Mesi experiences a tropical savanna climate, characterized by distinct wet and dry seasons, profoundly impacting air quality dynamics. The dry season, typically spanning from October to March, presents the most significant air quality challenges. Reduced rainfall and lower humidity contribute to a drier atmosphere, increasing the susceptibility of vegetation to fire. Agricultural practices, specifically the burning of crop residue to clear land for planting, become prevalent during this period, releasing substantial amounts of particulate matter and smoke into the air. Temperature inversions are more likely to occur during the cooler nights of the dry season, trapping pollutants near the ground. The harmattan winds, a dry and dusty trade wind blowing from the Sahara Desert, can also exacerbate the situation, carrying fine particulate matter into the region. The wet season, from April to September, brings relief as rainfall washes away pollutants and increased humidity helps to settle particulate matter. However, periods of intense rainfall can lead to flooding, which can stir up dust and mold spores, temporarily degrading air quality. During the transition months (March/April and September/October), air quality can be variable, influenced by shifting wind patterns and the gradual change in humidity. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak burning periods and periods of high dust. Maintaining indoor air quality through proper ventilation and air filtration is also advisable.