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Gunjur, nestled on the West Coast of Gambia at approximately 13.18°N, 16.76°W, presents a unique geographic profile significantly influencing its air quality. The town sits within a low-lying coastal plain, just inland from the Atlantic Ocean, a defining feature shaping local weather patterns and pollutant dispersal. Gunjur’s terrain is predominantly flat, with gentle undulations towards the interior, facilitating relatively uniform air movement, though localized variations occur due to vegetation and building density. The surrounding landscape is a mosaic of mangrove forests, coastal scrub, and small-scale agricultural fields, primarily focused on rice cultivation and vegetable farming. This agricultural activity, while vital to the local economy, can contribute to particulate matter through burning practices and fertilizer use. The urban–rural gradient around Gunjur is gradual; the town blends seamlessly into the surrounding rural areas, with limited distinct industrial zones. However, the proximity to Brikama, a larger urban center approximately 20 kilometers to the northeast, introduces potential for transported pollutants. The Gambia River, though not immediately adjacent, exerts a regional influence on humidity and wind patterns. The coastal location means Gunjur is susceptible to sea breezes, which generally help to disperse pollutants, but can also carry salt spray and contribute to coastal haze. Elevation is minimal, rarely exceeding 15 meters above sea level, limiting the potential for topographic barriers to air flow and exacerbating ground-level pollutant concentrations during stagnant conditions.

Gunjur experiences a tropical climate characterized by distinct wet and dry seasons, profoundly impacting air quality dynamics. The dry season, typically from November to May, sees reduced rainfall and increased sunshine, leading to lower humidity. While this might seem beneficial, the lack of rainfall means fewer opportunities for natural pollutant washout. Dust from the Sahara, frequently carried by Harmattan winds during January and February, significantly degrades air quality, increasing particulate matter concentrations. The Harmattan, a dry, dusty trade wind, can transport fine particles over considerable distances, impacting visibility and respiratory health. The wet season, from June to October, brings frequent rainfall and higher humidity. These rains effectively ‘scrub’ the atmosphere, removing particulate matter and gaseous pollutants, leading to a noticeable improvement in air quality. However, periods of intense rainfall can temporarily increase fungal spores and mold, potentially affecting individuals with allergies or respiratory sensitivities. Temperature inversions, though less frequent than in temperate climates, can occasionally occur during the cooler months (December-January), trapping pollutants near the ground. Fog, particularly during the transition periods between seasons, can also exacerbate air quality issues by reducing air mixing. Outdoor activities are generally best enjoyed during the wet season, particularly July-September, when rainfall is consistent. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the Harmattan season and periods of heavy fog, minimizing outdoor exposure and taking necessary precautions.