Kérou Air Quality Index (AQI)

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Kérou, situated in the Atacora Department of Benin, occupies a landscape characteristic of the country’s northern regions – a transitional zone between the humid south and the arid Sahel. Located at coordinates 10.8250, 2.1094, the city rests on gently undulating terrain, part of the Atacora Mountains foothills, at an elevation of approximately 350 meters. This elevation, while moderate, influences local wind patterns and can contribute to temperature inversions. Kérou isn’t directly adjacent to a major body of water, though smaller streams and seasonal rivers dissect the surrounding area. The urban character is defined by a relatively dispersed settlement pattern, reflecting a strong agricultural base. Surrounding Kérou are extensive areas of savanna woodland and cultivated fields, primarily focused on subsistence farming – maize, yams, and cotton are common crops. The urban-rural gradient is quite sharp; beyond the immediate city limits, the landscape quickly transitions to rural agricultural land. Dust from agricultural activities, particularly during the dry season, is a significant factor impacting local air quality. Limited industrial activity within Kérou itself means that pollution sources are largely localized to domestic fuel burning and vehicle emissions, exacerbated by the region’s climate and land use.

Kérou experiences a distinct wet and dry season, heavily influencing air quality. The dry season, spanning roughly November to April, is characterized by hot, dry Harmattan winds blowing from the Sahara. These winds carry substantial amounts of dust and particulate matter, leading to a significant increase in airborne pollutants. February and March are typically the months with the poorest air quality, posing risks to respiratory health. During this period, avoiding strenuous outdoor activity is advisable, particularly for children, the elderly, and individuals with pre-existing respiratory conditions. The onset of the wet season in May brings a temporary improvement in air quality as rainfall washes away accumulated dust. However, increased humidity can also promote mold growth, potentially triggering allergic reactions. The peak of the wet season, from July to September, generally offers the cleanest air, though localized flooding can create stagnant water, fostering mosquito breeding and associated health concerns. October sees a transition period with fluctuating conditions. Temperature inversions, common during cooler nights, can trap pollutants near ground level regardless of the season, worsening air quality locally. Monitoring wind direction is crucial, as pollutants can be transported from neighboring agricultural areas.