Manta Air Quality Index (AQI)

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Manta, nestled within the Atacora region of Benin (coordinates 10.3564° N, 1.1056° E), presents a unique geographic profile significantly influencing its air quality. Situated in a transitional zone between the forested north and the savanna south, Manta’s terrain is characterized by gently undulating hills and valleys, a consequence of ancient geological processes. The elevation, though modest, creates localized microclimates that can trap pollutants. The surrounding landscape is predominantly rural, a mosaic of small-scale agriculture – primarily maize, millet, and cassava – interspersed with patches of shea and other indigenous trees. This agricultural activity, while vital to the local economy, contributes to particulate matter through burning practices, particularly during land clearing and harvest seasons. Manta’s proximity to the Pendjari National Park, a biodiversity hotspot, means that while the park itself acts as a carbon sink, any transboundary pollution events can impact the city. The urban–rural gradient is relatively sharp; the city itself is small, with a population of just over 13,000, meaning urban sprawl is limited. However, the close integration of agricultural land within the city limits means that rural pollution sources are readily transported into the urban environment. There are no major industrial belts immediately adjacent to Manta, but regional trade routes pass through, potentially introducing vehicle emissions. The lack of significant water bodies nearby limits the natural cleansing effect of humidity and rainfall, further impacting air quality dynamics.

Manta’s tropical savanna climate dictates a distinct wet and dry season cycle, profoundly impacting its air quality. The dry season, typically spanning from November to March, is characterized by lower rainfall and increased sunshine hours. This period often sees a build-up of particulate matter due to reduced precipitation to wash pollutants from the atmosphere and increased agricultural burning for land preparation. Temperature inversions, where cooler air becomes trapped beneath a layer of warmer air, are more frequent during the dry season, further exacerbating the trapping of pollutants near the ground. Dust storms, originating from the Sahel region to the north, can also impact air quality during this time, carrying fine particulate matter over considerable distances. The wet season, from April to October, brings higher humidity and frequent rainfall, which naturally clears the air. However, heavy rainfall can also lead to increased fungal spores and allergens, impacting respiratory health. Fog, particularly in the early morning hours during the transition periods between seasons, can trap pollutants, creating localized pockets of poor air quality. Sensitive groups, such as children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, particularly in November and December when agricultural burning is most prevalent. Outdoor activities are generally more favourable during the wet season, although pollen allergies should be considered. The interplay of wind patterns, temperature fluctuations, and rainfall dictates the overall air quality profile throughout the year, creating a dynamic and seasonally-dependent environment.