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Dembī Dolo, nestled within the Oromīya region of Ethiopia at coordinates 8.5353, 34.8003, is a town characterized by its highland setting. Situated at an elevation of approximately 1,780 meters (5,840 feet), the terrain is undulating, typical of the Ethiopian Highlands, and largely composed of volcanic rock and fertile soils. The surrounding landscape is dominated by agricultural lands, primarily smallholder farms cultivating crops like teff, maize, and coffee. While no major bodies of water directly border Dembī Dolo, it lies within the watershed of several smaller rivers and streams that feed into larger systems further east. The urban-rural gradient is quite sharp; the town itself is relatively compact, quickly giving way to rural agricultural areas. This proximity to agricultural practices significantly influences air quality, particularly during harvest seasons when crop residue burning is common. The town’s location isn’t near any major industrial belts, meaning the primary pollution sources are localized – domestic fuel burning, vehicle emissions (though limited), and agricultural activities. The prevailing winds, influenced by the highland topography, play a crucial role in dispersing or concentrating pollutants. Dust from unpaved roads also contributes to particulate matter levels, especially during the dry season. The town’s growth is constrained by the terrain, leading to a relatively dense settlement pattern.

Dembī Dolo experiences a distinct bimodal rainfall pattern, defining its ‘wet’ and ‘dry’ seasons rather than traditional four seasons. The primary wet season, *kiremt*, runs from June to September, bringing relief from dust and temporarily improving air quality as rainfall washes away particulate matter. However, increased humidity can also foster mold growth indoors, impacting respiratory health. The short dry season, *bega*, from October to February, sees a build-up of pollutants due to temperature inversions trapping emissions near the ground. This is a period when domestic fuel burning for heating increases, exacerbating the issue. March to May constitutes the smaller dry season, *belg*, and is often the worst period for air quality. Farmers frequently engage in controlled burns to clear fields for planting, releasing significant amounts of smoke and particulate matter. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during this time. The winds are generally calmer during the dry seasons, hindering pollutant dispersal. November and December are particularly challenging. Monitoring local conditions and staying indoors when smoke is visible is advisable. The wet season offers the most favourable conditions for outdoor activity, though vigilance regarding mold is still necessary.