Ségbana Air Quality Index (AQI)

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Ségbana, nestled within the Alibori Department of Benin, occupies a geographically significant position in the northern savanna region. Located at approximately 10.9278° N, 3.6944° E, the city’s terrain is characterized by gently undulating plains, typical of the Sahelian transition zone. The surrounding landscape is predominantly agricultural, a mosaic of millet, sorghum, and maize fields interspersed with acacia woodlands and scattered shea trees – a vital resource for local communities. Elevation ranges from roughly 250 to 350 meters above sea level, influencing local wind patterns and temperature gradients. While Ségbana lacks immediate proximity to major rivers, it benefits from seasonal watercourses that contribute to the region’s agricultural productivity. The urban–rural gradient around Ségbana is relatively sharp; the city acts as a market and administrative hub for a largely rural population engaged in subsistence farming and small-scale trade. This creates a unique dynamic where agricultural practices, including burning of crop residues after harvest, can significantly impact local air quality. The city’s location within a transitional climate zone, between the humid south and the arid north, means it experiences distinct wet and dry seasons, each influencing atmospheric stability and pollutant dispersion. The absence of large-scale industrial zones within immediate proximity mitigates some pollution risks, but the reliance on biomass for cooking and heating, coupled with agricultural emissions, remains a key factor shaping the city’s air quality profile. The prevailing winds, generally from the north during the dry season, can transport pollutants across the region.

Ségbana’s air quality follows a distinct seasonal pattern dictated by its tropical savanna climate. The dry season, spanning roughly November to April, presents the most challenging period. Reduced rainfall leads to lower atmospheric moisture, promoting temperature inversions – a phenomenon where a layer of warm air traps cooler air near the ground, hindering pollutant dispersal. This stagnation, combined with the widespread burning of agricultural residues after the harvest (typically November-December), results in elevated particulate matter concentrations. Dust storms, common during this period, further exacerbate the situation, carrying fine particles over long distances. The months of January and February often experience the poorest air quality due to the confluence of these factors. Conversely, the wet season (May to October) brings relief. Frequent rainfall effectively ‘washes’ pollutants from the atmosphere, and increased humidity helps to disperse them. Stronger winds associated with the monsoon season also contribute to improved air quality. However, periods of intense rainfall can lead to localised flooding, potentially releasing pollutants from stagnant water sources. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution periods. During the wet season, while generally cleaner, vigilance is still advised during periods of heavy rainfall and potential flooding. The use of improved cookstoves and sustainable agricultural practices are crucial for mitigating air pollution throughout the year, particularly during the dry season when the impact is most pronounced.