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Banjul, the capital city of The Gambia, occupies a unique geographical position as a narrow peninsula extending into the Atlantic Ocean at the mouth of the Gambia River, with its urban core concentrated on Saint Mary's Island. This coastal location at approximately 13.5°N latitude places Banjul within West Africa's tropical zone, where the Atlantic Ocean and river estuary significantly influence local climate patterns and air quality dynamics. The city's terrain is predominantly flat, with elevations rarely exceeding 5 meters above sea level, creating minimal natural ventilation barriers against pollution accumulation. Banjul's urban character reflects its colonial port origins, with dense settlement patterns along the peninsula and limited green spaces, while the surrounding Greater Banjul Area extends inland with more dispersed development. The city's position between the Atlantic Ocean to the west and the Gambia River estuary to the east creates a distinctive microclimate where sea breezes can disperse pollutants, but also where temperature inversions can trap emissions during certain seasons. The urban-rural gradient shows decreasing pollution levels as one moves eastward along the river or northward into less populated areas, though agricultural zones along the riverbanks contribute occasional biomass burning emissions. Banjul's port activities and limited industrial belt along the waterfront combine with dense vehicular traffic on constrained road networks to create persistent pollution sources within this geographically confined urban area.

Banjul's air quality follows distinct seasonal patterns shaped by the West African monsoon system and Harmattan winds. During the dry season from November through February, pollution reaches its peak as northeasterly Harmattan winds transport Saharan dust across the region, combining with local emissions from vehicle exhaust, waste burning, and domestic biomass cooking. These months experience reduced rainfall and frequent temperature inversions that trap pollutants near the surface, particularly during cool nights and mornings. Sensitive groups including children, elderly residents, and those with respiratory conditions should limit outdoor activities during morning hours in these peak months. The transition period of March through May sees gradually improving conditions as humidity increases and occasional rainfall begins to wash pollutants from the atmosphere. The rainy season from June through October brings substantial relief, with southwest monsoon winds from the Atlantic Ocean dispersing pollutants and frequent thunderstorms cleansing the air through wet deposition. This period represents the most favourable time for outdoor activities, though occasional dust intrusions can still occur. The seasonal variation creates a clear pattern where November through February requires heightened awareness about air quality, while June through October offers consistently better conditions for respiratory health and outdoor pursuits throughout the Banjul metropolitan area.