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Iseyin is a significant urban center in Oyo State, Nigeria, situated approximately 100 kilometers north of Ibadan in the southwestern region of the country. The city lies within the Yoruba heartland at coordinates 7.9667°N, 3.6000°E, positioned on the transitional zone between the tropical rainforest to the south and the Guinea savanna to the north. This geographic placement gives Iseyin a distinctive urban character as a commercial and agricultural hub, with terrain characterized by gently rolling hills and an elevation around 400 meters above sea level, which provides some natural ventilation but can also trap pollutants under certain conditions. The city's location affects air quality through its proximity to extensive agricultural zones, particularly for crops like cassava, yams, and maize, where seasonal burning of farmland contributes particulate matter to the atmosphere. Iseyin sits within Nigeria's textile production belt, with local industries including weaving and dyeing operations that release emissions, though these are generally small-scale compared to major industrial centers. The urban-rural gradient shows dense central markets and residential areas transitioning to farmland, with the Ogun River basin to the east influencing local humidity patterns. The surrounding landscape of wooded savanna and occasional rock outcrops creates a mixed environment where both natural dust and human-generated pollutants interact, with limited large water bodies to moderate temperatures or cleanse the air through precipitation scavenging.

Iseyin experiences a tropical wet and dry climate with distinct seasonal variations that significantly influence air quality patterns throughout the year. During the dry season from November to March, harmattan winds blow from the Sahara Desert, carrying fine dust particles that dramatically reduce visibility and increase particulate pollution, making these months particularly challenging for respiratory health. December and January typically see peak pollution levels as temperature inversions trap pollutants near the surface during cool nights, with morning fog sometimes exacerbating conditions by combining with smoke from domestic cooking and agricultural burning. The rainy season from April to October brings relief through regular precipitation that washes pollutants from the air, with June through August offering the cleanest air as monsoon rains peak. However, brief periods of stagnant air can occur between rain events, especially in April and May during the transition months. Sensitive groups including children, elderly residents, and those with asthma or heart conditions should limit outdoor exertion during harmattan months and on days with visible haze, while planning outdoor activities for early mornings after rainfall during wet months. The city's elevation provides some mitigation against extreme heat stress but doesn't prevent seasonal pollutant accumulation when regional wind patterns dominate. Residents should monitor local visibility as a practical indicator of air quality, with poor visibility during harmattan signaling high particulate levels requiring precautionary measures.