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Āsasa, nestled within the Oromīya region of Ethiopia at approximately 7.1000° N, 39.1944° E, occupies a geographically significant position within the Ethiopian Highlands. The city’s elevation, around 1,700 meters (5,577 feet) above sea level, contributes to a cooler climate compared to lower-lying areas and influences atmospheric stability. Āsasa is surrounded by a landscape dominated by rolling hills and plateaus, characteristic of the broader Oromīya region. This terrain can trap pollutants, particularly during periods of low wind. The surrounding area is primarily agricultural, with small-scale farming prevalent, cultivating crops like teff, maize, and barley. While Āsasa itself is a relatively small urban center with a population of roughly 19,506, it serves as a local market town for the surrounding rural communities. The urban–rural gradient is gradual, with agricultural land quickly transitioning to residential and commercial areas within the city limits. There are no major rivers or large bodies of water immediately adjacent to Āsasa, which limits natural air purification processes. The absence of significant industrial belts directly within the city is a mitigating factor, however, agricultural burning practices in the surrounding areas, particularly during land clearing and harvest seasons, represent a potential source of particulate matter pollution. The highland climate, with its potential for temperature inversions, can exacerbate this issue by preventing vertical mixing of air pollutants. The regional position, far from major industrial hubs, means that long-range transport of pollutants is less likely, but local sources remain the primary concern.

Āsasa’s air quality experiences a distinct seasonal pattern dictated by the interplay of rainfall, temperature, and agricultural practices. The region experiences a wet season (typically June to September) and a dry season (October to May). During the wet season, increased rainfall generally leads to improved air quality as precipitation washes away particulate matter and dilutes gaseous pollutants. However, heavy downpours can also temporarily increase dust levels as soil is loosened. The dry season presents a more complex picture. As temperatures rise, atmospheric stability increases, leading to more frequent temperature inversions, particularly during the cooler mornings. These inversions trap pollutants near the ground, resulting in periods of poorer air quality. Agricultural burning, a common practice for land preparation and crop residue disposal, intensifies during the dry season, significantly contributing to particulate matter pollution. November through February often sees the highest concentrations of these pollutants. Fog, which can form during the cooler months, further exacerbates the problem by reducing visibility and trapping pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor activity and avoiding areas with visible smoke. The transition months of May and October represent periods of moderate air quality, as rainfall increases and agricultural burning decreases. Overall, the dry season months pose the greatest challenge for air quality in Āsasa, demanding heightened awareness and preventative measures.