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Metahāra, nestled in the Oromīya region of Ethiopia at coordinates 8.9000, 39.9167, is a relatively small city with a population of approximately 21,348. Its location within the Ethiopian Highlands significantly influences its climate and, consequently, its air quality. The city sits at an elevation of roughly 1,500 meters (4,921 feet), contributing to cooler temperatures than lower-lying areas. The surrounding landscape is characterised by rolling hills and agricultural land, primarily dedicated to crop cultivation. Metahāra benefits from proximity to the Shebelle River, a crucial water source for irrigation and local communities, though this also introduces potential for localised humidity and associated atmospheric conditions. While not a major industrial hub, the city serves as a market centre for the surrounding agricultural region, leading to increased vehicular traffic and dust from transport activities. The urban-rural gradient is quite sharp; the city centre quickly transitions into farmland. This proximity to agricultural practices means seasonal burning of crop residue is a significant factor. The terrain, while not mountainous, creates localised wind patterns that can trap pollutants, particularly during temperature inversions. The city’s position within the broader East African Rift Valley also influences regional weather systems and air mass movement.

Metahāra experiences a 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 particulate matter from the atmosphere. However, increased humidity can also foster mould growth, impacting respiratory health. The short dry season, *bega*, from January to March, offers the clearest skies and most favourable conditions for outdoor activity. The longer dry season, *bona*, from November to February, is when air quality typically deteriorates. This is due to increased dust from agricultural activities, vehicle emissions, and the potential for temperature inversions trapping pollutants near the ground. March and April often see increased burning of fields in preparation for planting, exacerbating particulate matter levels. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during *bona* and periods of agricultural burning. Wind patterns shift seasonally, with stronger winds during the wet season helping to disperse pollutants, while calmer conditions prevail during the dry seasons, leading to stagnation. Fog can also occur during cooler mornings, trapping pollutants.