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Sinsina, nestled within the Sikasso Region of Mali, occupies a geographically significant position in the southwestern part of the country. Located at approximately 12.3517° latitude and -5.4422° longitude, the city’s terrain is characterized by gently undulating plains, part of the larger Sahelian landscape transitioning towards the more humid Sudan savanna zone. The elevation is relatively low, averaging around 250-300 meters above sea level, which can contribute to the stagnation of air pollutants under certain meteorological conditions. Sinsina’s proximity to the Niger River basin, though not directly on the river itself, influences regional climate patterns and humidity levels. The surrounding landscape is predominantly agricultural, with extensive fields of sorghum, millet, and maize dominating the rural areas. This agricultural activity, while vital for the local economy, can contribute to particulate matter pollution, particularly during harvesting and burning seasons. The urban–rural gradient around Sinsina is gradual, with small villages and agricultural plots interspersed within the broader landscape. There's a limited industrial presence within Sinsina itself; however, the region experiences some small-scale processing of agricultural products, potentially releasing localized emissions. The city’s location within a relatively flat expanse means that wind patterns are often influenced by broader regional weather systems, impacting the dispersion of pollutants. The lack of significant topographic barriers can exacerbate the build-up of pollutants during periods of low wind speed and temperature inversions.

Sinsina experiences a distinct wet and dry season pattern typical of the Sahelian climate, profoundly impacting air quality throughout the year. The dry season, generally spanning from November to April, is characterized by lower humidity, higher temperatures, and frequent dust storms originating from the Sahara Desert to the north. These events significantly elevate particulate matter concentrations, particularly PM10 and PM2.5, posing a respiratory health risk. Wind patterns during this period can be erratic, sometimes bringing in clean air but often exacerbating dust intrusion. The harmattan winds, a dry and dusty trade wind, are particularly impactful during January and February. The wet season, from May to October, brings relief from dust but introduces its own air quality challenges. Increased humidity can trap pollutants closer to the ground, and biomass burning associated with agricultural practices—clearing fields after harvest—becomes a significant source of smoke and carbon monoxide. Fog, though infrequent, can occur during cooler nights in the early wet season, further concentrating pollutants. The months of June and July often see elevated levels of smoke due to agricultural burning. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit outdoor activity during dust storm events and periods of heavy biomass burning. During the wet season, periods of heavy rainfall can temporarily improve air quality by washing pollutants from the atmosphere, but the subsequent humidity can lead to a rebound in pollution levels.