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Ross-Bétio, situated within the larger city of Saint-Louis in Senegal, occupies a unique geographical position on the Langue de Barbarie, a narrow, sandy peninsula separating the Atlantic Ocean from the Senegal River delta. This location, at approximately 16.28°N latitude and 16.14°W longitude, dictates much of its environmental character. The terrain is remarkably flat, barely rising above sea level, making it highly vulnerable to coastal erosion and saltwater intrusion. The surrounding landscape is dominated by the Atlantic coastline to the west and the expansive Senegal River delta and associated wetlands to the east. Historically, Saint-Louis, and by extension Ross-Bétio, thrived as a major trading post, but this legacy has also brought localised industrial activity, primarily related to fishing and processing. The urban-rural gradient is sharp; moving inland from the peninsula quickly transitions into agricultural lands, particularly rice paddies, along the riverbanks. This proximity to both marine and agricultural sources contributes to specific air quality challenges. Dust from the Sahara Desert, carried by Harmattan winds, frequently impacts the region, while the interplay of sea breezes and land temperatures creates localised circulation patterns that can trap pollutants. The narrowness of the peninsula limits natural ventilation, exacerbating the effects of any emissions.

Ross-Bétio’s air quality follows a distinct seasonal pattern largely dictated by the interplay of the Harmattan winds and the West African Monsoon. The dry season, roughly November to May, sees a significant increase in particulate matter due to the influx of Saharan dust carried by the Harmattan. These winds, blowing from the Sahara, can reduce visibility and irritate respiratory systems. January and February are typically the months with the poorest air quality due to this phenomenon. The transition to the wet season, around June, brings a temporary improvement as rainfall washes away dust and suppresses airborne particles. However, the monsoon season (June-October) isn’t without its challenges. Increased humidity can promote the formation of mould and mildew, impacting indoor air quality. Furthermore, increased rainfall can lead to localised flooding, stirring up sediment and organic matter. August and September, while offering relief from dust, can experience elevated levels of biological pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during Harmattan season and take precautions during periods of high humidity. Monitoring wind direction is crucial; onshore winds will bring marine aerosols, while easterly winds signal the arrival of Saharan dust.