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Saki is a historic city in southwestern Nigeria's Oyo State, situated at coordinates 8.6667°N, 3.4000°E, approximately 100 kilometers northwest of Ibadan and near the border with Benin. Nestled in the Yoruba heartland at an elevation of around 450 meters above sea level, Saki occupies a transitional zone between the Guinea savanna and the derived savanna, characterized by gently rolling terrain with scattered inselbergs. The city lies about 40 kilometers east of the Ogun River basin, though no major water bodies directly border the urban core. Saki's geography positions it within Nigeria's agricultural belt, particularly known for yam, cassava, and maize cultivation, with surrounding rural areas practicing both subsistence and commercial farming. The urban-rural gradient is pronounced, with the compact city center giving way to farmlands and scattered settlements. This location affects air quality through multiple pathways: agricultural burning during land preparation seasons contributes particulate matter, while the city's position away from coastal influences means pollutants can accumulate under stable atmospheric conditions. The savanna landscape, with its seasonal vegetation changes, influences dust generation, particularly during the dry Harmattan season when northeasterly winds transport Saharan dust across the region. Urban expansion has increased local pollution sources, including vehicular emissions and small-scale industries, while the city's elevation provides some natural ventilation compared to lower-lying areas.

Saki experiences a tropical wet and dry climate with distinct seasonal variations that significantly influence air quality patterns. During the dry season from November to March, air pollution typically peaks, especially from December to February when the Harmattan wind blows Saharan dust southwestward across West Africa. This period brings hazy conditions with elevated particulate matter levels, reducing visibility and potentially exacerbating respiratory issues. The coldest months of December and January sometimes experience temperature inversions that trap pollutants near the surface, particularly in the early mornings. From April to October, the rainy season brings relief as precipitation scavenges pollutants from the atmosphere, with air quality generally best from June to September when rainfall is heaviest. However, occasional biomass burning for land preparation before rains can cause short-term pollution spikes in April and May. Sensitive groups including children, the elderly, and those with respiratory conditions should limit outdoor activities during Harmattan months, particularly in the mornings when pollutant concentrations are highest. The transition months of March-April and October-November offer moderate conditions, though variable. During rainy months, while air quality improves, high humidity can combine with pollutants to create discomfort for some individuals. Monitoring local weather advisories about Harmattan intensity and dust forecasts provides valuable guidance for planning outdoor activities throughout the year.