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Guédiawaye is a densely populated urban commune situated within Senegal's Dakar Region, positioned at approximately 14.7724°N latitude and 17.3884°W longitude along the Atlantic coastline of West Africa. This city forms part of the greater Dakar metropolitan area, located just northeast of Dakar proper, creating a continuous urban fabric that extends along the Cap-Vert peninsula. The terrain is predominantly flat coastal plain with minimal elevation variation, typically ranging from sea level to about 20 meters above, characteristic of Senegal's Petite Côte region. Guédiawaye's proximity to the Atlantic Ocean—approximately 5 kilometers from the coast—provides some natural ventilation, but this benefit is often mitigated by the city's position within an urban corridor that experiences concentrated emissions from transportation, residential energy use, and small-scale commercial activities. The city sits adjacent to agricultural zones to the north and east, though rapid urbanization has reduced this rural buffer. Surrounding landscape includes the Niayes depression system—a network of shallow wetlands and dunes—which can influence local microclimates but offers limited protection from regional pollution transport. Guédiawaye's location within the Dakar industrial belt, combined with its high population density of approximately 329,659 residents in a compact area, creates significant local emission sources. The urban-rural gradient shows decreasing pollution levels moving away from the city center toward peripheral areas, though this gradient is compressed due to Dakar's contiguous development. Geographic factors affecting air quality include sea breezes that can disperse pollutants inland during daytime but may recirculate them at night, and the city's position downwind of Dakar's port and industrial areas during prevailing northeasterly Harmattan winds.

Guédiawaye experiences distinct seasonal air quality patterns influenced by West Africa's monsoon system and the Harmattan wind regime. During the dry season from November to May, air pollution typically peaks, with the most challenging months being January through March when Harmattan winds transport Saharan dust from the northeast. These winds carry fine particulate matter that combines with local urban emissions from vehicles, residential cooking (often using charcoal or wood), and small industries, creating hazy conditions that reduce visibility and increase respiratory risks. Temperature inversions are less common than in temperate climates but can occur during cool nights in December and January, trapping pollutants near the surface. The rainy season from June to October brings relief as monsoon rains wash pollutants from the atmosphere, with July and August showing the cleanest air. However, high humidity during this period can exacerbate ozone formation from precursor emissions. Sensitive groups—including children, elderly residents, and those with asthma or cardiovascular conditions—should minimize outdoor exertion during Harmattan episodes and on days with visible haze. The best months for outdoor activities are typically July through September when rainfall is frequent and winds are southerly, bringing cleaner marine air. During peak pollution months, residents should keep windows closed during dust events and consider using air purifiers indoors. The transition months of October-November and May-June see variable conditions as wind patterns shift, requiring daily monitoring of local air quality advisories.