Djibo Air Quality Index (AQI)

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Djibo, situated in the Sahel region of Burkina Faso (coordinates 14.1011° N, -1.6306° W), occupies a geographically challenging yet strategically important location. The city’s terrain is predominantly characterized by undulating plains and gently sloping hills, typical of the Sahelian landscape, with elevations ranging from approximately 250 to 350 meters above sea level. This relatively low elevation, combined with the flat surrounding terrain, contributes to limited natural air circulation, a key factor influencing local air quality. Djibo lies within a transitional zone between the arid Sahara Desert to the north and the more humid Sudanian savanna to the south, resulting in a semi-arid climate and sparse vegetation cover. The immediate landscape is dominated by grasslands, scrubland, and scattered acacia trees, with limited surface water sources; the nearest significant river, the Niger River, is a considerable distance away. The urban–rural gradient around Djibo is sharp, transitioning quickly from the built environment to extensive agricultural fields, primarily dedicated to millet, sorghum, and maize cultivation. These agricultural practices, including the burning of crop residue after harvest, represent a significant localized source of particulate matter. While Djibo lacks major industrial belts, the presence of small-scale workshops and markets, often utilizing charcoal for cooking and heating, adds to the localized pollution burden. The city’s position within a wider agricultural zone means that dust storms originating from the Sahara can frequently impact air quality, carrying fine particles across vast distances.

Djibo’s air quality follows a distinct seasonal pattern dictated by its semi-arid climate. The dry season, spanning roughly from November to May, presents the most significant air quality challenges. During this period, minimal rainfall leads to exceptionally dry conditions, fostering the generation of dust and particulate matter from agricultural lands and unpaved roads. Strong, persistent winds, common during the dry season, readily lift and transport these particles, resulting in frequent episodes of elevated dust concentrations. Temperature inversions, particularly during the cooler months (December-February), can trap pollutants near the ground, exacerbating the problem. The harmattan wind, a dry, dusty trade wind blowing from the Sahara, frequently impacts Djibo, significantly degrading air quality. Conversely, the wet season (June to October), characterized by sporadic but intense rainfall, provides a natural cleansing effect, washing away accumulated pollutants and reducing dust levels. However, the onset of the monsoon can also bring localized flooding, potentially releasing pollutants from stagnant water sources. The months of March, April, and May, coinciding with the end of the dry season and the beginning of agricultural activities, are typically the most challenging for air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor exposure and wearing appropriate masks when necessary. During the wet season, while overall air quality improves, vigilance regarding waterborne diseases is crucial.