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Bourèm Guindou, situated in the Gao Region of Mali (16.9004° N, -0.3500° E), occupies a precarious position within the Sahelian zone, a transitional landscape between the Sahara Desert and Sudanian Savanna. The city’s geography is dominated by the Niger River, a vital artery for both transportation and agriculture, though its flow is highly seasonal. Bourèm Guindou lies on a relatively flat alluvial plain, characteristic of the river’s floodplain, resulting in low elevation – typically below 200 meters above sea level. This flatness contributes to poor air circulation, particularly during periods of atmospheric stability. The surrounding landscape is primarily arid grassland and sparse acacia woodland, punctuated by agricultural fields cultivated during the rainy season. The urban–rural gradient is sharp; the city transitions quickly into sparsely populated agricultural areas and then into the vast expanse of the Sahel. There are no significant industrial belts immediately adjacent to Bourèm Guindou, though agricultural practices, particularly the burning of vegetation after harvest, represent a localized source of air pollutants. The proximity to the Niger River, while providing a water source, also introduces the potential for waterborne pollutants that can become aerosolized and impact air quality. Dust storms, a common feature of the Sahel, are frequently transported into the region, significantly degrading air quality and visibility. The prevailing winds, often influenced by regional weather patterns, can either disperse pollutants or trap them within the low-lying terrain, exacerbating local air quality challenges. The city’s location within a semi-arid climate zone makes it particularly vulnerable to the impacts of desertification and land degradation, further contributing to dust pollution.

Bourèm Guindou’s air quality follows a distinct seasonal pattern dictated by the region’s wet and dry seasons. The dry season, spanning roughly November to May, is characterized by consistently high temperatures, low humidity, and frequent dust storms. These storms, originating from the Sahara and surrounding areas, are a primary driver of poor air quality, carrying fine particulate matter that penetrates deep into the respiratory system. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, further intensifying the problem. The months of January and February often experience the worst air quality due to the confluence of these factors. The rainy season, from June to October, brings a temporary respite. Rainfall effectively ‘washes’ pollutants from the atmosphere, and increased humidity can help to settle dust particles. However, agricultural practices during this period, including the burning of crop residues, can introduce localized plumes of smoke and particulate matter. The monsoon winds, while bringing rain, can also transport pollutants from distant sources. Fog, though infrequent, can occur during the transition periods between seasons, trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during peak dust storm periods and avoiding strenuous exertion. Maintaining indoor air quality through proper ventilation and filtration is also crucial. During the rainy season, while overall air quality improves, awareness of localized smoke from agricultural burning remains important.