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Ibadan, Nigeria's third-largest city, occupies a distinctive geographic position in southwestern Nigeria's Oyo State, not Lagos State as sometimes misattributed. Situated approximately 128 kilometers northeast of Lagos, Ibadan lies within the tropical forest-savanna transition zone, characterized by undulating terrain with an average elevation of 230 meters above sea level. The city sprawls across seven hills, creating natural drainage basins that influence both urban development and pollution dispersion patterns. Ibadan's location places it at the heart of Nigeria's agricultural belt, surrounded by cocoa, cassava, and yam farmlands that contribute seasonal biomass burning emissions. The city lacks major water bodies within its immediate urban core, though the Ogunpa River flows through densely populated areas, historically prone to flooding that stirs up sediment and pollutants. Ibadan's urban-rural gradient shows rapid expansion into peri-urban areas where informal industries like foundries and metal workshops operate alongside traditional settlements. The city's position along major transportation corridors connecting Lagos to northern Nigeria ensures constant vehicle exhaust emissions, while its bowl-like topography in certain districts traps pollutants during atmospheric inversions. This geographic setting creates a complex air quality scenario where urban emissions interact with agricultural residues and natural dust transport.

Ibadan's tropical wet-and-dry climate creates distinct seasonal air quality patterns that residents must navigate carefully. During the dry season from November through February, pollution reaches its peak as multiple factors converge: the Harmattan wind blows mineral dust from the Sahara Desert, combining with local emissions from increased generator use during power outages, vehicle exhaust, and widespread waste burning. These months feature frequent temperature inversions that trap pollutants near the ground, creating persistent haze that reduces visibility and respiratory comfort. Sensitive groups including children, elderly residents, and those with asthma should limit outdoor activities during morning hours when inversions are strongest and consider wearing N95 masks on visibly hazy days. The rainy season from March to October brings relief through precipitation that scrubs pollutants from the air, with June through August offering the cleanest air for outdoor exercise and activities. However, the early rainy months of March-May see increased road dust from unpaved surfaces mixing with rainfall, creating temporary spikes in particulate matter. The transitional months of September-October feature reduced rainfall but increased agricultural burning around the city as farmers clear land, creating localized smoke plumes. Understanding these seasonal rhythms allows residents to plan outdoor activities during cleaner periods while taking precautions during peak pollution months.