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Msambweni, nestled within the Kwale County of Kenya, occupies a geographically significant position along the Indian Ocean coastline, approximately 30 kilometers south of Mombasa. Its coordinates, -4.4667, 39.4667, place it within a low-lying coastal plain, characterized by gently undulating terrain and sandy soils. The immediate surrounding landscape is dominated by palm-fringed beaches, mangrove forests, and the expansive Indian Ocean. Inland, the terrain gradually rises, transitioning into a mosaic of small-scale farms cultivating cashew nuts, coconuts, and maize, alongside patches of indigenous woodland. This urban-rural gradient is a defining feature, with Msambweni itself representing a small, developing settlement bridging the gap between coastal tourism and rural agriculture. The proximity to the ocean exerts a strong influence on local climate and air quality, introducing a constant marine breeze that can both disperse pollutants and, under certain conditions, trap them. There are no major industrial belts directly adjacent to Msambweni; however, the larger industrial and port activities of Mombasa, located to the north, can occasionally contribute to transboundary air pollution events. The relatively flat topography and limited elevation (generally below 50 meters above sea level) mean that air pollutants tend to remain closer to the ground, particularly during periods of calm winds. The prevalence of informal settlements and reliance on biomass fuels for cooking further contribute to localized air quality challenges, particularly within the town itself.

Msambweni experiences a tropical climate with distinct wet and dry seasons, significantly impacting its air quality profile. The long rainy season typically spans from March to May, and again from October to December, bringing increased humidity and frequent rainfall. During these periods, air quality generally improves as precipitation washes away particulate matter and the increased moisture helps to suppress dust. However, the heavy rains can also lead to flooding, which can temporarily release pollutants from saturated soils and stagnant water. The dry seasons, from January to February and June to September, present a different scenario. Reduced rainfall and increased sunshine lead to drier conditions, promoting dust generation from unpaved roads and agricultural fields. Calm wind conditions are more frequent during these months, particularly in the mornings, which can lead to the formation of temperature inversions – a layer of warm air trapping cooler air (and pollutants) near the ground. This is especially noticeable in the early morning hours. The months of July and August often see a slight increase in haze due to regional dust transported from the Horn of Africa. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor activity during peak morning hours and avoiding areas with high dust levels. The marine breeze, while generally beneficial, can occasionally carry salt spray and allergens, impacting air quality for some individuals. Overall, the wettest months offer the most favourable air quality, while the drier months, particularly with stagnant air, require greater vigilance.