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Gatumba, nestled within Bujumbura Rural province in Burundi, occupies a critical position along the Rusizi River, bordering the Democratic Republic of Congo. Its coordinates, -3.3333, 29.2500, place it in a gently undulating landscape, part of the broader Great Rift Valley. The terrain is characterised by hills and valleys, influencing local wind patterns and creating microclimates. The Rusizi River, a vital waterway, contributes to humidity and potentially traps pollutants during temperature inversions. Gatumba’s urban character is largely defined by its role as a border town and market centre, experiencing significant cross-border trade and movement. Surrounding the town are predominantly agricultural zones, with subsistence farming and small-scale plantations dominating the landscape. This agricultural activity contributes to particulate matter through tilling and burning of vegetation. The urban-rural gradient is relatively sharp, transitioning quickly from the concentrated activity of Gatumba to the rural farmlands. The proximity to the DRC introduces complexities in pollution sources, as industrial activity and waste management practices on the other side of the border can impact air quality in Gatumba. The elevation, while not extreme, influences atmospheric stability and dispersion of pollutants. This confluence of factors makes Gatumba particularly vulnerable to localised air quality issues.

Gatumba experiences a bimodal rainfall pattern, defining its ‘seasons’ as distinct wet and dry periods. The long dry season, typically from June to September, sees a significant increase in airborne dust and particulate matter. Reduced rainfall means less atmospheric cleansing, and agricultural practices like land preparation and burning contribute heavily to pollution. This is often the least favourable time for outdoor activity, particularly for those with respiratory conditions. The short wet season, from October to December, brings temporary relief as rainfall washes pollutants from the air. However, increased humidity can also exacerbate mould growth, impacting indoor air quality. The second, shorter dry season, from January to February, presents similar challenges to the longer one, though less intense. The long wet season, March to May, generally offers the best air quality, with consistent rainfall and higher humidity suppressing dust. Temperature inversions, common during the cooler nights of the dry seasons, trap pollutants near ground level. Sensitive groups – children, the elderly, and those with pre-existing respiratory illnesses – should limit strenuous outdoor activity during the dry seasons and consider using masks when dust levels are high. Monitoring wind direction is crucial, as pollutants from the DRC can be readily transported into Gatumba.