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Lagos sprawls across Nigeria's southwestern coast on the Bight of Benin, its geography fundamentally shaping its notorious air quality challenges. Situated on flat coastal plains with minimal elevation—rarely exceeding 40 meters—the city occupies a series of islands, lagoons, and mainland areas interconnected by bridges and causeways. This low-lying terrain, combined with proximity to the Atlantic Ocean and extensive lagoon systems, creates poor natural ventilation that traps pollutants. Lagos serves as West Africa's economic powerhouse, with its port—one of Africa's busiest—spewing shipping emissions directly into urban airsheds. The city's explosive, unplanned growth has created a stark urban-rural gradient, where dense metropolitan cores like Ikeja and Victoria Island transition abruptly into peri-urban settlements. Industrial belts cluster along the Apapa-Oshodi corridor and in Ikeja, while agricultural zones lie fragmented in outer fringes. Surrounding landscapes include mangrove swamps to the east and sandy barrier islands to the south, but these natural features offer little mitigation against the city's pollution dome. The coastal location exacerbates humidity that binds particulate matter, while sea breezes occasionally disperse emissions inland rather than cleansing the air. This geographic context makes Lagos particularly vulnerable to pollution accumulation, with its position as a low-lying coastal megacity amplifying the impact of its numerous emission sources.

Lagos experiences distinct seasonal air quality patterns driven by its tropical wet-and-dry climate, with pollution peaking dramatically during the dry season from November through March. During these months, the Harmattan wind blows dust-laden air from the Sahara Desert across West Africa, combining with local emissions to create hazardous haze. Reduced rainfall and frequent temperature inversions trap pollutants near the ground, particularly overnight and early morning when generator use peaks. Sensitive groups—including children, elderly residents, and those with respiratory conditions—should minimize outdoor activities during this period, especially when visibility drops. The wet season from April to October brings relief as monsoon rains scrub pollutants from the atmosphere, though brief spikes can occur after downpours when roads flood and vehicles churn up sediment. June through August typically offers the cleanest air, making these months preferable for outdoor exercise. However, high humidity during the rainy season can exacerbate respiratory discomfort even when pollutant concentrations are lower. Coastal fog occasionally forms in transitional months, temporarily trapping emissions near the surface. Year-round, morning commutes coincide with peak pollution from vehicles and generators, making late afternoon generally safer for outdoor exposure. Visitors with asthma or heart conditions should monitor local air quality advisories, particularly during Harmattan episodes when particulate matter concentrations soar.