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Kaya, situated in the Centre-Nord region of Burkina Faso, occupies a relatively flat terrain at an elevation of approximately 280 meters. This positioning within the broader Sahelian zone significantly influences its air quality. The city isn’t proximate to major bodies of water; instead, it’s surrounded by expansive savannah grasslands and agricultural lands, primarily dedicated to millet, sorghum, and cotton cultivation. Kaya serves as a crucial market centre for this agricultural production, leading to increased truck traffic and associated emissions. The urban-rural gradient is quite pronounced, with a rapid transition from densely populated residential areas in the city centre to more dispersed rural settlements and farmland. Dust from agricultural activities, particularly during the dry season, is a major contributor to particulate matter pollution. The city’s location along key transport routes connecting Niamey (Niger) and Ouagadougou (Burkina Faso) further exacerbates traffic-related emissions. Limited industrial activity within Kaya itself means that the primary pollution sources are largely non-industrial, stemming from transport, domestic fuel burning (wood and charcoal), and agricultural practices. The prevailing winds, often originating from the Sahara, can transport dust plumes southward, impacting air quality, especially during harmattan conditions.

Kaya experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, roughly from November to May, is characterised by consistently high levels of particulate matter. Harmattan winds, blowing from the Sahara, carry substantial amounts of dust, reducing visibility and irritating respiratory systems. January and February are typically the months with the poorest air quality. Temperatures soar during this period, exacerbating dust suspension. The transition to the wet season (June-October) brings a dramatic improvement. Rainfall effectively suppresses dust, washing particulate matter from the atmosphere. However, increased humidity can also promote the growth of mould and allergens, potentially affecting sensitive individuals. September and October, while offering relief from dust, can experience localised smoke from agricultural burning as farmers prepare fields for the next planting season. During the wet season, temperature inversions are less frequent, allowing for better atmospheric mixing. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor exposure during peak dry season months and be mindful of potential allergen spikes during the wet season. Monitoring local conditions is crucial.