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Ségala Mba, nestled within the Kayes Region of Mali, occupies a geographically significant position on the edge of the Sahel, a transitional zone between the Sahara Desert and the savannas of West Africa. Located at approximately 14.56° N, 10.96° W, the city’s terrain is characterized by gently undulating plains, part of the larger Bani River basin. The surrounding landscape is predominantly semi-arid, featuring sparse vegetation, acacia woodlands, and expanses of cultivated land. The Bani River, though not directly adjacent to Ségala Mba, influences the regional climate and hydrology, contributing to localized humidity and occasional flooding during the rainy season. Elevation is relatively low, averaging around 250 meters above sea level, which can exacerbate air stagnation under certain meteorological conditions. The urban footprint of Ségala Mba is relatively compact, exhibiting a gradual urban-rural gradient as it expands outwards. Agriculture plays a vital role in the regional economy, with surrounding areas dedicated to cultivating crops like millet, sorghum, and maize. While Ségala Mba itself doesn't possess major industrial belts, its proximity to Kayes, a larger regional hub, means it is indirectly influenced by industrial activities and transportation corridors. The prevailing winds, often light and variable, are crucial in dispersing pollutants, but can also lead to localized accumulation, particularly during periods of atmospheric stability. The Sahelian climate, with its distinct wet and dry seasons, significantly impacts the regional air quality dynamics, influencing dust events and the concentration of biomass burning emissions.

Ségala Mba’s air quality follows a distinct seasonal pattern dictated by its Sahelian climate. The dry season, typically spanning from November to May, is characterized by intense solar radiation, low humidity, and frequent dust storms originating from the Sahara and the Bodélé Depression. These events, often occurring in February and March, significantly degrade air quality, reducing visibility and increasing particulate matter concentrations. Wind patterns during this period are generally light and variable, which can lead to the stagnation of dust and pollutants. The onset of the rainy season (June to October) brings a temporary reprieve, as rainfall washes away accumulated pollutants and increased humidity helps to bind particulate matter. However, the rainy season also introduces its own challenges. Biomass burning, associated with agricultural practices like land clearing and crop residue disposal, becomes more prevalent, releasing significant amounts of smoke and gases into the atmosphere. Fog events, though infrequent, can occur during cooler nights, trapping pollutants near the ground. Temperature inversions, where cooler air is trapped beneath warmer air, are also possible, further hindering vertical mixing and exacerbating air quality issues. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season dust events and periods of intense biomass burning. Outdoor activities are generally best avoided during these times, and the use of face masks is recommended. The transitional months of May and November present a period of fluctuating air quality, requiring vigilance and awareness of changing weather patterns.