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Bargny, a coastal town in the Dakar region of Senegal, presents a unique geographic context influencing its air quality. Situated at approximately 14.6944°N, -17.2306°W, Bargny lies on a relatively flat coastal plain, characterized by sandy beaches and low-lying terrain. The Atlantic Ocean dominates the western boundary, providing a significant influence on local weather patterns and acting as a potential pathway for marine aerosols. The town is part of a rapidly urbanizing corridor extending from Dakar, experiencing a pronounced urban-rural gradient as one moves inland. This gradient is marked by a shift from coastal fishing communities and small-scale agriculture to more industrial and residential areas. Bargny’s proximity to Dakar, a major industrial hub, is a key factor. While Bargny itself has some local industry, including cement production and fishing-related activities, it receives pollutants transported from the larger metropolitan area. The surrounding landscape features a mix of scrubland, agricultural fields (primarily smallholder farming), and increasingly, residential development. The prevailing winds, generally from the Atlantic, can either disperse or concentrate pollutants depending on seasonal shifts and atmospheric stability. The lack of significant topographical features means limited natural barriers to pollutant dispersion, making Bargny particularly vulnerable to air quality impacts from both local and regional sources. The coastal location also means potential for salt spray and humidity to influence pollutant chemistry and deposition.

Bargny experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, roughly November to May, is characterized by the Harmattan wind, a hot, dry, and dusty trade wind blowing from the Sahara Desert. This wind significantly elevates particulate matter (PM10 and PM2.5) levels, reducing visibility and exacerbating respiratory issues. January to March are typically the months with the poorest air quality due to the peak influence of the Harmattan. During this period, sensitive individuals – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity. The arrival of the wet season, from June to October, brings relief from dust but introduces new challenges. Increased humidity can promote the formation of mold and mildew, impacting indoor air quality. Rainfall helps to wash away particulate matter, initially improving conditions, but can also lead to increased surface runoff carrying pollutants into waterways. The monsoon season, with its heavier rainfall and potential for flooding, can mobilize dust and debris, temporarily worsening air quality. September and October, while offering cooler temperatures, can experience localized pollution from stagnant water and increased biological activity. Overall, the transition periods between seasons present the most variable air quality, requiring increased vigilance.