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Kasongo, nestled within Maniema Province in the Democratic Republic of the Congo, occupies a geographically significant position at approximately -4.45° latitude and 26.65° longitude. The city’s terrain is characterized by undulating hills and valleys, typical of the eastern Congolese highlands, with an elevation averaging around 1,400 meters above sea level. This elevation contributes to a cooler climate compared to lowland areas, but also creates conditions conducive to temperature inversions, a key factor influencing air quality. Kasongo is surrounded by a mosaic of landscapes: dense tropical rainforest to the south and east, gradually transitioning into savanna grasslands to the north and west. The Ituri River, a vital waterway, flows nearby, though its direct influence on Kasongo’s immediate air quality is limited. The surrounding region is predominantly rural, with small-scale agriculture – manioc, maize, and plantains – being the dominant economic activity. There's a gradual urban-rural gradient, with agricultural practices and associated burning contributing to regional particulate matter. While Kasongo itself lacks large-scale industrial zones, it serves as a regional trading hub, with increased vehicular traffic impacting local air quality. The city’s location within a basin-like topography can trap pollutants, particularly during periods of low wind. Deforestation for agriculture and charcoal production in the surrounding areas further exacerbates the issue, releasing significant amounts of smoke and particulate matter into the atmosphere, impacting the city’s air quality.

Kasongo’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from June to October, presents the most significant air quality challenges. Reduced rainfall leads to lower atmospheric moisture, promoting the accumulation of pollutants. Agricultural burning, a common practice for land clearing and crop residue disposal, intensifies during this period, releasing substantial quantities of smoke, carbon monoxide, and particulate matter. Temperature inversions are more frequent during the dry season, trapping pollutants close to the ground, particularly in the mornings and evenings. The prevailing winds, often light and variable, offer limited dispersion of these pollutants. The wet season, from November to May, brings increased rainfall, which naturally washes pollutants from the atmosphere, leading to improved air quality. However, periods of heavy fog, common during the wet season, can temporarily reduce visibility and trap moisture-bound pollutants. While the wet season generally offers respite, the increased humidity can exacerbate respiratory issues for sensitive individuals. It is advisable to limit strenuous outdoor activity during the dry season, especially for children, the elderly, and those with pre-existing respiratory conditions. During the wet season, while overall air quality is better, individuals with asthma or allergies should remain vigilant for fog-related irritants. Local authorities should prioritize controlled burning practices and promote alternative agricultural techniques to mitigate the dry season’s pollution peaks.