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Ipetumodu, nestled within the Osun State of Nigeria, occupies a strategically important position within the southwestern region. Located at approximately 7.4999° latitude and 4.4472° longitude, the town sits on a gently undulating terrain, characteristic of the derived savanna woodland that dominates the area. Its elevation, while modest, contributes to localized microclimates and influences air circulation patterns. The surrounding landscape is a mosaic of agricultural fields – predominantly maize, cassava, and yam cultivation – interspersed with pockets of denser woodland and small settlements. This agricultural activity, while vital to the local economy, can contribute to seasonal particulate matter emissions, particularly during harvesting and burning practices. Ipetumodu’s proximity to larger urban centers like Ile-Ife and Ibadan, though not immediately adjacent, places it within a broader regional network of human activity and potential pollution transport. The urban–rural gradient is noticeable, with Ipetumodu exhibiting a distinct blend of traditional rural character and emerging urban influences, reflected in its infrastructure and population density. The town’s location away from major rivers or large bodies of water means humidity levels are generally lower, which can affect the dispersion of pollutants. Prevailing winds, typically from the southwest during the wet season, play a crucial role in transporting air masses and influencing local air quality, often bringing in pollutants from upwind sources. The relatively flat topography around Ipetumodu can also lead to stagnant air conditions, particularly during periods of low wind speed, exacerbating localized pollution.

Ipetumodu’s tropical climate dictates a distinct wet and dry season cycle, profoundly impacting its air quality. The dry season, typically spanning from October to March, often witnesses a noticeable increase in particulate matter. This is largely attributable to agricultural practices; farmers frequently employ controlled burns to clear fields for planting, releasing significant quantities of smoke and soot into the atmosphere. Reduced rainfall during this period also limits the natural cleansing effect of precipitation, allowing pollutants to persist longer. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, further degrading air quality. The wet season, from April to September, brings relief as increased rainfall washes away particulate matter and dilutes gaseous pollutants. However, the onset of the monsoon season can also introduce dust from the Sahel region, carried by strong winds, impacting air quality with coarse particulate matter. Fog, occasionally forming during the cooler mornings of the wet season, can also temporarily reduce visibility and concentrate pollutants. Outdoor activities are generally more favorable during the wet season months of June, July, and August, when rainfall is frequent and wind speeds are typically higher. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning, and consider limiting prolonged outdoor exposure. Maintaining indoor air quality through proper ventilation and air filtration can also provide some protection.