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Kati sits as a strategic gateway to the Malian capital, Bamako, nestled within the semi-arid Sahelian belt of the Koulikoro Region. The terrain is characterized by vast, flat expanses of sandy soils and sparse savanna vegetation, reflecting a landscape that transitions sharply between dense urban development and rural agricultural hinterlands. Positioned on a plateau slightly removed from the immediate banks of the Niger River, the town experiences a dry, dusty environment where the natural topography offers little in the way of windbreaks. This openness makes the city particularly susceptible to the transport of airborne particulates. The urban character of Kati is defined by its role as a critical military and administrative hub, creating a concentrated center of activity surrounded by sprawling residential zones and small-scale farming plots. The proximity to Bamako creates a continuous urban-rural gradient, where vehicular emissions from the heavily trafficked corridor between the two cities merge with the dust of the unpaved roads. This synergy of industrial activity, military logistics, and traditional agriculture ensures that the air quality is heavily influenced by both anthropogenic pollutants and natural mineral dust. The lack of significant forest cover or high-altitude barriers allows pollutants to linger during periods of atmospheric stability, while the surrounding agricultural zones contribute seasonal plumes of smoke during land clearing. Consequently, Kati's geographic position renders it a focal point for the intersection of regional dust storms and haze.

In Kati, air quality is dictated by the dramatic oscillation between the dry and wet seasons. From December to February, the region is dominated by the Harmattan, a northeasterly trade wind that carries immense quantities of mineral dust from the Sahara Desert. During these months, visibility drops and particulate matter spikes, creating a persistent haze that irritates the respiratory system. This period represents the peak of pollution, as temperature inversions often trap dust and smoke from biomass burning near the ground. As the transition toward the hot season occurs in March and April, heat-induced turbulence may lift some pollutants, but the intense dryness persists. The arrival of the monsoon rains from June to September provides a critical atmospheric cleansing. Heavy precipitation washes particulate matter from the air, leading to the cleanest air of the year and a significant drop in respiratory distress. However, the transitional periods are often marked by agricultural burning, where farmers clear land, sending plumes of carbonaceous smoke across the landscape. For sensitive groups, including children and the elderly, the Harmattan months are the most hazardous, requiring the use of masks and limited outdoor exertion. Conversely, the rainy season is the ideal window for outdoor activity. Health guidance emphasizes avoiding the early morning haze during the dry season when pollutants are most concentrated. By understanding this binary meteorological cycle, residents can better navigate the severe health risks associated with the Sahelian atmosphere.