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Massigui is situated within the heart of the Koulikoro region in Mali, embodying the quintessential characteristics of a Sahelian settlement. The terrain is predominantly flat, characterized by an expansive semi-arid savanna that stretches toward the horizon, where the horizon blends into a pale, dusty sky. Positioned in a transition zone between the Sahara Desert to the north and the more humid Sudanese savanna to the south, the city's geography plays a pivotal role in its atmospheric composition. The lack of significant topographic barriers allows for the unimpeded movement of air masses, making the town highly susceptible to the transboundary transport of mineral dust. While not directly on the banks of the Niger River, Massigui exists within its broader hydrological influence, which modulates local humidity and soil moisture. The urban character is defined by a low-density sprawl where residential areas bleed seamlessly into agricultural zones, creating a permeable urban–rural gradient. This proximity to farmland introduces significant seasonal air quality challenges, as the burning of crop residues is a common land-management practice. Furthermore, the prevalence of unpaved roads ensures that wind-blown particulate matter remains a constant presence. The elevation is relatively low, which, combined with intense solar radiation, often leads to strong convective mixing during the day but can facilitate shallow temperature inversions at night, trapping pollutants close to the ground and impacting the respiratory health of the local population through the concentration of particulates in the breathing zone.

In Massigui, air quality is governed by the stark dichotomy between the dry and wet seasons. From November to March, the city is dominated by the Harmattan, a dry, northeasterly trade wind that carries vast quantities of mineral dust from the Sahara. During these months, particulate matter reaches its annual peak, creating a persistent haze that reduces visibility and irritates the respiratory system. Temperature inversions are common during the cool winter nights, trapping biomass smoke from cooking fires near the surface. Consequently, sensitive groups, including children and the elderly, should limit outdoor exertion during the early morning hours when smog is densest. Transitioning into the wet season from June to September, the arrival of the West African Monsoon brings transformative relief. Heavy rainfall effectively scrubs the atmosphere, washing away suspended particulates and drastically lowering the air pollution levels. This period is the most favorable for outdoor activities, as the air is cleansed and the soil is dampened, preventing dust mobilization. However, the transition months of April and May can be volatile, characterized by intense heat and sporadic dust storms known as haboobs. Health guidance for residents emphasizes the use of protective face coverings during the Harmattan peak and the importance of hydration to maintain mucosal membranes against dry, dusty air. By understanding these cycles, the community can better navigate the atmospheric risks associated with their unique Sahelian climate and the seasonal rhythms of the region, ensuring better long-term health outcomes.