Boukoumbé Air Quality Index (AQI)

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Boukoumbé, nestled in the Atacora region of northern Benin (10.1833° N, 1.1000° E), occupies a geographically significant position at the edge of the Pendjari National Park, a crucial biodiversity hotspot. The city’s terrain is characterized by undulating hills and valleys, a consequence of the Precambrian basement rock underlying the region. Elevation ranges from approximately 350 to 500 meters above sea level, influencing local air circulation patterns. Boukoumbé sits within a transitional zone, exhibiting a gradual urban–rural gradient. To the west and south, agricultural lands dominate, primarily cultivating maize, millet, and sorghum, with occasional burning practices contributing to localized particulate matter. Eastward, the landscape transitions into the denser forests of the Pendjari ecosystem, acting as a natural air filter, though deforestation pressures can diminish this effect. The city itself is a modest urban center, exhibiting a traditional layout with a central market area and radiating residential zones. There are no major industrial belts directly adjacent to Boukoumbé; however, the nearby town of Tanguiéta, known for its hydroelectric dam and associated industries, can occasionally influence regional air quality through transboundary pollution events. The relatively dry climate and limited surface water bodies—though seasonal streams exist—mean that atmospheric moisture plays a less significant role in pollutant dispersion compared to coastal regions. The surrounding savanna and forest ecosystems, while generally beneficial, are susceptible to seasonal fires, which can dramatically impact air quality.

Boukoumbé experiences a distinct wet and dry season, profoundly impacting its air quality profile. The dry season, typically spanning from November to March, presents the greatest air quality challenges. Reduced rainfall and lower humidity lead to increased atmospheric stability, fostering temperature inversions, particularly during the cooler mornings. These inversions trap pollutants near the ground, exacerbating particulate matter concentrations from agricultural burning, domestic cooking fires (reliant on wood and charcoal), and vehicle emissions. Dust storms, common during this period, further degrade air quality, carrying fine particles over considerable distances. The harmattan wind, a dry, dusty trade wind originating from the Sahara, frequently impacts Boukoumbé during January and February, significantly reducing visibility and increasing respiratory irritation. The wet season, from April to October, brings relief as increased rainfall and higher humidity naturally cleanse the atmosphere, washing away particulate matter and diluting gaseous pollutants. However, periods of intense rainfall can lead to flooding, which can temporarily release pollutants from stagnant water sources. Months like July and August, coinciding with the peak of the rainy season, generally offer the best air quality. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution hours (early morning and late afternoon) and ensuring adequate ventilation indoors. The prevalence of biomass cooking necessitates improved ventilation and, ideally, transitioning to cleaner cooking fuels.