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Paoskoto, nestled within the Kaolack Region of Senegal (coordinates 13.7833° N, -15.8167° W), presents a compelling case study in West African urban geography and its interplay with air quality. Situated approximately 170 kilometers southeast of Dakar, the city occupies a relatively flat, alluvial plain formed by the Senegal River basin. This low-lying terrain, averaging around 15 meters above sea level, contributes to potential stagnation of pollutants, particularly during periods of low wind. The surrounding landscape is predominantly characterized by extensive agricultural fields – a vital component of the regional economy, focused on groundnuts, millet, and rice cultivation. This proximity to intensive agriculture introduces potential sources of particulate matter, including dust from tilling and burning of crop residues, though regulations are evolving. To the west, the Senegal River itself provides a moderating influence, offering some degree of humidity and occasional breezes. However, the river's proximity also means the city is susceptible to seasonal flooding, which can temporarily exacerbate air quality issues by mobilizing sediments and organic matter. Paoskoto’s urban form is relatively compact, exhibiting a gradual urban–rural gradient as one moves outwards. There are no major industrial belts immediately adjacent to Paoskoto, but the broader Kaolack region does contain some processing facilities related to the agricultural sector, and transport corridors connecting it to Dakar and other regional hubs contribute to vehicular emissions. The flat topography and prevailing wind patterns, often influenced by the Harmattan wind during the dry season, significantly shape the city’s air quality profile.

Paoskoto’s air quality experiences a distinct seasonal cycle dictated by the region’s tropical climate, characterized by a pronounced wet and dry season. The dry season, typically spanning November to May, presents the greatest air quality challenges. During these months, reduced rainfall and lower humidity lead to increased dust levels, originating from agricultural lands and regional wind events like the Harmattan. This wind, blowing from the Sahara, carries significant quantities of fine particulate matter, impacting visibility and respiratory health. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants close to the ground, further worsening conditions. Conversely, the wet season (June to October) brings relief. Frequent rainfall effectively ‘washes’ pollutants from the atmosphere, leading to a noticeable improvement in air quality. Higher humidity also reduces dust suspension. However, periods of intense rainfall can lead to localized flooding, which, as mentioned previously, can temporarily degrade air quality. The months of February and March often see the highest concentrations of particulate matter due to a combination of Harmattan influence and agricultural activities. Outdoor activities are generally more favorable during the wet season, particularly July and August. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and considering the use of face masks when dust levels are high. The transition months (May and November) can be unpredictable, with fluctuating wind patterns and rainfall, requiring adaptive strategies for managing air quality risks.