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Wobulenzi, a rapidly growing town in Luwero District, Uganda, sits approximately 50km north of Kampala, strategically positioned along the Kampala-Gulu highway. The town’s geography is characterised by gently rolling hills, typical of the Lake Victoria basin’s agricultural heartland. Located at coordinates 0.7200, 32.5300, Wobulenzi’s elevation is around 1,200 meters above sea level, influencing temperature and atmospheric conditions. The surrounding landscape is dominated by matoke (banana) plantations, coffee farms, and increasingly, sugarcane fields, reflecting the region’s agricultural focus. While not directly on Lake Victoria, the lake’s influence on regional humidity is significant. Wobulenzi’s air quality is intrinsically linked to this agricultural activity, with seasonal burning of crop residue being a major contributor to particulate matter. The urban-rural gradient is becoming increasingly blurred as Wobulenzi expands, absorbing surrounding villages. Limited industrial activity within the town itself is offset by transport emissions from the highway and dust from unpaved roads. The town’s position in a valley can also contribute to localised air stagnation, trapping pollutants during calm weather conditions. Understanding these geographical factors is crucial for addressing Wobulenzi’s evolving air quality challenges.

Wobulenzi experiences a bimodal rainfall pattern, defining its ‘seasons’ for air quality considerations. The first rainy season, typically March to May, brings temporary relief from dust and agricultural burning, leading to improved air quality. However, increased humidity can foster mould growth, impacting respiratory health. June to August represents the first dry season, coinciding with increased agricultural activity, including land preparation and burning of vegetation after harvest. This period often sees a peak in particulate matter pollution. September to November brings the second rainy season, again offering a respite, though localised flooding can exacerbate mould issues. December to February is the longest and driest period, marked by high temperatures and increased dust from roads and farms. This is generally the worst time for air quality. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near ground level. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry seasons, particularly in December and January. Monitoring wind patterns is vital, as winds from agricultural areas can quickly transport pollutants into the town.