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Kollo, situated in the Tillabéri Region of Niger, lies at the heart of a predominantly rural landscape, approximately 70 kilometers north of the capital, Niamey. Its coordinates (13.0167° N, 1.8833° E) place it within the Sahelian zone, a transitional region between the Sahara Desert to the north and the Sudanian Savanna to the south. The terrain is generally flat, characteristic of the Niger River basin, with an elevation hovering around 200 meters. The city’s location is intrinsically linked to the Niger River, which provides a vital water source for agriculture and sustains the surrounding ecosystems. Kollo functions as a significant agricultural market town, serving the surrounding farming communities. This agricultural activity, while crucial for the local economy, contributes to seasonal dust and particulate matter in the air, particularly during dry periods and harvest times. The urban-rural gradient is pronounced; Kollo itself is a relatively small urban center, quickly giving way to farmland and sparse vegetation. The lack of substantial industrial development within Kollo itself means that local air quality is less impacted by industrial emissions, but regional dust transport from the Sahara and agricultural practices are key determinants. The prevailing winds, often originating from the Sahara, exacerbate these conditions, carrying fine sand and dust particles into the area.

Kollo experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, spanning roughly November to May, is characterized by consistently high temperatures and low humidity. This period sees a significant increase in airborne dust and particulate matter, driven by strong Harmattan winds sweeping across the Sahara. These winds transport fine sand and dust particles, reducing visibility and impacting respiratory health. January to March are typically the months with the poorest air quality. The transition to the wet season, beginning in June, brings relief. Rainfall gradually washes away accumulated dust, improving air quality. However, increased humidity can also promote mold growth, potentially affecting indoor air quality. July to September represent the wettest months, generally offering the most favorable conditions for outdoor activity. As the wet season wanes in October, dust levels begin to rise again. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants near the ground, worsening air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor exposure during peak dust periods and consider using masks when necessary. Monitoring local conditions and staying indoors during dust storms is crucial.