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Āsosa, nestled within the Bīnshangul Gumuz region of Ethiopia, occupies a geographically significant position at approximately 10.0667°N latitude and 34.5167°E longitude. The city’s terrain is characterised by undulating hills and valleys, typical of the Ethiopian Highlands, though at a relatively lower elevation compared to the central plateau. This location places Āsosa within a transitional zone between the highlands and the lower-lying plains towards Sudan. The surrounding landscape is dominated by savanna woodlands and agricultural lands, primarily focused on coffee cultivation, a key economic driver for the region. The proximity to the Blue Nile River, while not immediately adjacent, influences local humidity and potentially contributes to localised temperature inversions. The urban-rural gradient is quite sharp; Āsosa itself is a relatively small urban centre surrounded by predominantly rural agricultural communities. Air quality is intrinsically linked to this landscape. Dust from agricultural activities, particularly during dry seasons, is a significant contributor to particulate matter. Furthermore, the use of biomass fuels for cooking and heating within both the city and surrounding villages introduces substantial smoke pollution. The lack of heavy industry within Āsosa itself mitigates some industrial pollution concerns, but regional factors, like transboundary dust transport, can still impact air quality.

Āsosa experiences a distinct wet and dry season cycle, heavily influencing its air quality. The wet season, generally spanning from June to September, brings relief from dust and particulate matter as rainfall effectively suppresses airborne particles. However, increased humidity can also foster mould growth, potentially exacerbating respiratory issues for sensitive individuals. October to May constitutes the dry season, witnessing a marked deterioration in air quality. The lack of rainfall allows dust from agricultural lands and unpaved roads to accumulate, leading to higher concentrations of PM10 and PM2.5. January and February are typically the driest months, representing the peak pollution period. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near ground level, further worsening conditions. Harmattan winds, originating from the Sahara, can also transport significant amounts of dust southward, impacting Āsosa. For those with respiratory conditions, avoiding strenuous outdoor activity during the dry season, particularly January-March, is advisable. The wet season offers the most favourable conditions for outdoor activities, though vigilance regarding mould and humidity-related issues is still necessary. Localised burning of agricultural waste after harvest also contributes to temporary spikes in pollution during the transition periods.