Tiahounkossi Air Quality Index (AQI)

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Tiahounkossi, nestled within the Atacora region of northern Benin, occupies a geographically significant position at approximately 10.8167° N, 1.0667° E. The city’s terrain is characterized by undulating hills and valleys, a typical feature of the Sahelian transition zone. Elevation ranges from roughly 350 to 450 meters above sea level, influencing local air circulation patterns. Surrounded by a mosaic of savanna grasslands and scattered woodlands, Tiahounkossi’s landscape is predominantly rural, exhibiting a gradual urban–rural gradient. The surrounding area is primarily agricultural, with small-scale farming practices – including millet, sorghum, and maize cultivation – dominating the land use. This agricultural activity, while vital for the local economy, can contribute to seasonal particulate matter emissions, particularly during harvesting and burning of crop residues. While Tiahounkossi lacks immediate proximity to major rivers or lakes, it draws water from seasonal streams and relies on groundwater resources. The city’s location within the Sahelian belt means it experiences a semi-arid climate, with limited rainfall and high temperatures. The regional position, bordering Togo, also means it is susceptible to transboundary air pollution events, though these are currently less significant than localized sources. The urban character is relatively low-density, with traditional housing styles prevalent, and limited heavy industry, though a small market and artisanal workshops contribute to localized pollution.

Tiahounkossi’s air quality follows a distinct seasonal pattern dictated by its tropical savanna climate. The dry season, spanning roughly November to April, typically sees a build-up of particulate matter. Reduced rainfall means less atmospheric cleansing, and the prevalence of dust storms originating from the Sahara Desert, carried by the Harmattan winds, significantly degrades air quality. These winds, often accompanied by periods of intense heat, can trap pollutants near the ground, exacerbating respiratory issues. The Harmattan’s impact is most pronounced in January and February. Conversely, the wet season (May to October) brings relief as increased rainfall washes away pollutants and higher humidity helps to trap particulate matter. However, the burning of agricultural waste after harvests, primarily in September and October, can lead to short-term spikes in smoke and particulate pollution. Temperature inversions, though less frequent than in colder climates, can occasionally occur during the cooler months (December-January), trapping pollutants in the lower atmosphere. Fog, while rare, can also contribute to stagnant air conditions. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit outdoor activity during the Harmattan season and avoid areas with visible smoke. During the wet season, be mindful of potential smoke from agricultural burning and take precautions when air quality visibly deteriorates.