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Malakal, the capital of Upper Nile State in South Sudan, occupies a pivotal geographic position along the eastern bank of the White Nile. Situated at an elevation of approximately 380 meters, the city serves as a crucial river port and a gateway to the Sudd, the vast, labyrinthine wetland system that defines the regional topography. The terrain is predominantly flat, characterized by expansive clay plains that undergo dramatic transformations between the dry and wet seasons. This low-lying, alluvial landscape significantly influences the local atmosphere, as the proximity to the Nile and the surrounding seasonal marshes creates a unique microclimate. Urban character in Malakal is defined by its role as a logistical hub, where riverine transport meets road networks connecting the northern and southern reaches of the country. The urban-rural gradient is subtle, with the built environment transitioning rapidly into rural agricultural zones where traditional pastoralist and subsistence farming practices dominate. Air quality in Malakal is intrinsically linked to this environmental context; the flat, open plains allow for the unimpeded movement of dust and smoke particles across the landscape. The lack of significant industrial belts means that pollution is largely driven by biomass burning for domestic cooking, the combustion of low-grade fuels in aging transport fleets, and the regional transport of aerosols from agricultural clearing. During the dry season, the desiccated soil of the surrounding plains becomes a source of windblown dust, which, when combined with the smoke from localized land management fires, profoundly impacts the ambient air quality for the city’s residents.

The atmospheric conditions in Malakal are dictated by the oscillation of the Intertropical Convergence Zone, which governs the transition between the arid dry season and the humid wet season. From November to April, the dry season brings the northeasterly winds that sweep across the Sahel, carrying substantial dust loads that degrade visibility and air quality. During these months, the lack of precipitation prevents the natural scrubbing of the atmosphere, leading to higher concentrations of particulate matter. Indoor air quality is particularly concerning during this period, as residents rely heavily on wood and charcoal for heating and cooking within enclosed spaces. As the wet season approaches in May, the arrival of moisture-laden southwesterly winds provides a reprieve. The rains act as a natural mechanism for deposition, washing pollutants out of the air and settling the dust that plagues the city during the dry months. However, the wet season introduces its own challenges, including high humidity levels that can exacerbate respiratory discomfort for sensitive populations. June through September are generally the most favorable months for outdoor activity, as the air is cleansed by frequent tropical storms. Nevertheless, the transition months, particularly October and November, witness a spike in pollution as farmers engage in post-harvest land clearing, often utilizing fire to manage crop residues. For those with pre-existing respiratory conditions, it is advisable to limit strenuous physical activity during the peak dry months of February and March when dust-laden air is most prevalent, ensuring that indoor ventilation is managed carefully to mitigate smoke exposure.