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Bukungu, a town in Buyende District, Uganda, is situated at coordinates 1.4361° N, 32.8686° E, nestled within the Lake Kyoga basin. The terrain is largely flat to gently undulating, characteristic of the region’s ancient Precambrian shield geology. The town’s elevation, approximately 1100 meters above sea level, influences temperature and atmospheric circulation. Bukungu’s air quality is significantly shaped by its rural-to-urban gradient; it’s not a heavily industrialised centre, but is surrounded by extensive agricultural land, primarily subsistence farming. This agricultural activity contributes to particulate matter through tilling, harvesting, and the burning of crop residues – a common practice after the harvest seasons. The proximity to Lake Kyoga, while providing a water source, can also contribute to localised humidity and potential for stagnant air masses, trapping pollutants. The surrounding landscape is dominated by savannah woodland and wetlands, influencing local wind patterns. Dust from unpaved roads is a consistent contributor to PM10 levels. The town’s relatively small size means pollution sources are concentrated, potentially leading to higher localised concentrations. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Bukungu.

Bukungu experiences a bimodal rainfall pattern, defining its ‘seasons’ as wet and dry. The first wet season, from March to June, sees increased humidity and reduced dust, generally improving air quality. However, increased agricultural activity during planting can lead to localised burning and elevated particulate matter. The first dry season, July to September, is typically the clearest period, with stable atmospheric conditions and minimal rainfall dispersing pollutants. October to December brings the second, and often heavier, wet season. This period sees increased fungal spores and mould, potentially impacting respiratory health. The second dry season, January to February, is often the most challenging for air quality. High temperatures and dry conditions exacerbate dust from roads and agricultural lands. 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 strenuous outdoor activity during January and February. Monitoring wind direction is key; winds from agricultural areas will carry higher particulate loads. Avoiding peak agricultural burning times is also advisable.