Salémata Air Quality Index (AQI)

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Salémata, nestled within the Kédougou Region of southeastern Senegal, occupies a geographically significant position at the edge of the Sahel, transitioning into a more wooded savanna landscape. Located at approximately 12.63°N, -12.82°W, the city’s elevation averages around 350 meters above sea level, contributing to a relatively cool climate compared to Senegal’s coastal regions. The surrounding terrain is characterized by rolling hills, punctuated by rocky outcrops and sparse vegetation typical of the transition zone. While Salémata itself lacks immediate proximity to major rivers, it sits within a watershed that feeds into the Niger River basin, influencing regional hydrology. The urban footprint is small, reflecting Salémata’s status as a relatively minor administrative and market center. The urban–rural gradient is sharp; the city quickly blends into agricultural lands dominated by small-scale farming, primarily cultivating millet, sorghum, and maize. Limited artisanal mining activities, particularly for gold, are present in the surrounding areas, potentially contributing localized dust pollution. There are no significant industrial belts nearby; the economy is largely agrarian and service-based. The prevailing winds are generally from the north during the dry season, shifting to more southerly and variable directions during the rainy season. This regional geography, with its mix of savanna, agricultural land, and limited industrial activity, shapes Salémata’s air quality profile, making it susceptible to dust intrusion and agricultural emissions.

Salémata’s air quality experiences a distinct seasonal cycle dictated by the region’s tropical savanna climate, characterized by a pronounced dry season (November to May) and a rainy season (June to October). The dry season presents the greatest air quality challenges. Strong, northerly winds, common during these months, frequently carry significant quantities of dust from the Sahara Desert and the Sahel region, leading to elevated particulate matter concentrations. Temperature inversions, particularly during the cooler mornings of December and January, can trap pollutants near the ground, exacerbating the situation. The rainy season brings a welcome respite, as rainfall effectively washes pollutants from the atmosphere and increased vegetation cover helps to filter the air. However, the onset of the monsoon can also bring localized humidity and fog, which, while reducing visibility, can also trap pollutants in stagnant air pockets. February and March often see peak dust events, while July and August typically experience the cleanest air. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak dust events. Agricultural burning, a common practice at the start of the rainy season to clear fields, can also contribute to localized air pollution episodes. Maintaining indoor air quality through proper ventilation and filtration is advisable during periods of elevated dust concentrations.