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Serekunda, situated within the Kanifing Municipal Council of The Gambia, represents West Africa's largest urban concentration and serves as the commercial heart of this slender river-nation. Nestled along the Atlantic coastline at approximately 13.4450°N, -16.6750°W, the city occupies flat coastal plains with minimal elevation variation, rarely exceeding 10 meters above sea level, creating a topography that influences atmospheric stagnation. Its strategic position at the mouth of the Gambia River estuary places it within a transitional zone where mangrove swamps to the south gradually give way to savannah woodlands inland, establishing a distinct urban-rural gradient. The city's dense, unplanned urban fabric—characterized by narrow streets and high population density—contrasts sharply with surrounding agricultural zones producing groundnuts, millet, and vegetables, though these farming areas contribute minimal particulate matter compared to urban sources. Proximity to the Atlantic Ocean provides natural ventilation through sea breezes, yet this benefit is counteracted by the city's position within the West African monsoon belt, where seasonal wind patterns alternately disperse or concentrate pollutants. The urban area lacks significant industrial belts but experiences air quality impacts from ubiquitous small-scale enterprises, aging vehicle fleets using low-quality fuels, residential biomass burning for cooking, and occasional transboundary dust from the Sahel region. The combination of coastal humidity, tropical temperatures, and dense urbanization creates a microenvironment where pollutants like particulate matter and nitrogen oxides can accumulate during periods of atmospheric stability, particularly when the harmattan winds from the Sahara desert sweep southward during the dry season.

Serekunda's air quality follows distinct seasonal patterns shaped by the West African monsoon system, with pollution levels fluctuating according to wind regimes, humidity, and atmospheric stability. During the dry season from November to May, air quality typically deteriorates as the northeast harmattan winds transport Saharan dust across the region, peaking between December and February when visibility reduces and fine particulate matter concentrations rise significantly. This period sees increased respiratory risks, particularly for sensitive groups like children, elderly residents, and those with pre-existing conditions, who should limit prolonged outdoor exposure during dusty afternoons. The transition to the rainy season from June to October brings relief as southwest monsoon winds from the Atlantic disperse pollutants and frequent rainfall scrubs the atmosphere clean, making these months—especially August and September—the most favourable for outdoor activities with minimal air quality concerns. However, high humidity during this wet period can occasionally trap pollutants near the surface during calm mornings before sea breezes develop. Temperature inversions are rare due to the tropical climate but can occur during cool, still nights in January and February, temporarily trapping vehicle emissions and biomass smoke. For visitors and residents planning activities, the late rainy season offers the cleanest air, while the harmattan months require precautions like wearing masks during dust events and monitoring local air quality advisories. Sensitive groups should particularly avoid strenuous outdoor exercise during peak harmattan conditions and ensure indoor ventilation systems are maintained to reduce indoor pollution exposure from cooking fuels.