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Hīrna, nestled within the Oromīya region of Ethiopia at coordinates 9.2167, 41.1000, is a small city of approximately 16,726 inhabitants. Its location is characterised by a high-altitude plateau landscape, typical of much of interior Ethiopia. The surrounding terrain is undulating, transitioning into more rugged highlands further afield. This elevation, around 2,200 meters above sea level, significantly influences local climate and air circulation patterns. Hīrna isn’t situated directly adjacent to a major body of water, though smaller streams and seasonal rivers likely traverse the area, providing vital water resources. The urban-rural gradient is quite sharp; Hīrna is surrounded by predominantly agricultural land, with subsistence farming being the dominant economic activity. While not a heavily industrialised centre, the increasing use of diesel generators for power, coupled with traditional biomass burning for cooking and heating, contributes to localised pollution. Dust from unpaved roads and agricultural activities also plays a role. The city’s position within a valley or basin could exacerbate pollution events through temperature inversions, trapping pollutants near ground level. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Hīrna.

Hīrna experiences a tropical highland climate, broadly defined by a wet season (Kiremt) from June to September and a dry season the remainder of the year. Air quality generally deteriorates during the dry season, peaking between November and February. This is due to increased dust resuspension from agricultural activities and unpaved roads, combined with temperature inversions that trap pollutants. The dry air and stable atmospheric conditions prevent dispersion. The wet season offers a temporary reprieve, as rainfall effectively washes particulate matter from the air. However, increased biomass burning for post-harvest activities can locally elevate pollution during this period, particularly in October as the rains subside. Wind patterns, generally easterly, can transport pollutants from surrounding agricultural areas into the city. Fog, common at this altitude, can also exacerbate particulate matter concentrations. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, especially in the mornings. March and April offer the most favourable conditions for outdoor activity. Monitoring local weather patterns is key to anticipating pollution episodes.