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Yabēlo, nestled within the Oromīya region of Ethiopia at approximately 4.88° N, 38.08° E, occupies a strategically important location on the eastern edge of the Ethiopian Highlands. The city’s elevation, averaging around 2,100 meters (6,889 feet) above sea level, significantly influences its climate and, consequently, its air quality. The surrounding landscape is characterized by rolling hills and plateaus, part of the broader Bale Mountains ecosystem, a biodiversity hotspot. This terrain often leads to localized wind patterns and can trap pollutants under certain meteorological conditions. Yabēlo sits on the periphery of a significant agricultural zone, with coffee and other crops dominating the rural areas immediately surrounding the city. This agricultural activity, while vital to the regional economy, contributes to particulate matter through burning practices and fertilizer use. Further afield, the Ethiopian Rift Valley extends, impacting regional weather systems. The urban–rural gradient is relatively sharp; Yabēlo transitions quickly from a concentrated urban area to agricultural land, minimizing the buffering effect often seen in larger metropolitan areas. While not directly adjacent to major rivers, the area receives rainfall from the highlands, contributing to humidity levels that can affect pollutant dispersion. The city’s position along key transport routes also introduces vehicular emissions, a growing concern as Yabēlo’s population and economic activity expand. The generally cooler temperatures associated with the high elevation can, paradoxically, exacerbate air quality issues during periods of temperature inversion.

Yabēlo’s air quality experiences a distinct seasonal pattern dictated by its tropical highland climate, characterized by a wet and a dry season. The dry season, typically spanning from October to May, often sees a noticeable increase in particulate matter. This is largely due to agricultural burning practices used for land clearing and crop residue disposal, releasing significant amounts of smoke and soot into the atmosphere. Reduced rainfall during this period also limits the natural cleansing effect of precipitation. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, further degrading air quality. The months of January and February are frequently periods of heightened concern. Conversely, the wet season (June to September) brings relief as frequent rainfall washes away accumulated pollutants and increased wind speeds disperse them. However, heavy rainfall can also lead to increased humidity, which, while not directly polluting, can affect the perception of air quality and exacerbate respiratory issues for sensitive individuals. Fog, particularly during the transitional periods between seasons, can also trap pollutants, creating localized pockets of poor air quality. Individuals with respiratory conditions, such as asthma, and young children should exercise caution during the dry season, limiting outdoor activity during peak pollution periods, typically in the mornings. During the wet season, while overall air quality improves, vigilance regarding potential allergens carried by the rain is advisable.