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Shashemenē, situated in Ethiopia's Oromīya Region at coordinates 7.2000°N, 38.6000°E, occupies a strategic position in the East African Rift Valley's highlands, approximately 200 kilometers south of Addis Ababa. Nestled at an elevation of around 1,900 meters above sea level, the city benefits from the temperate climate typical of the Ethiopian Highlands, though its specific climate zone remains undocumented. The urban character of Shashemenē blends administrative functions with agricultural market activities, serving as a regional hub for the surrounding rural communities. Its terrain is characterized by rolling hills and volcanic soils, part of the broader Rift Valley landscape that influences local weather patterns. Proximity to Lake Ziway, about 50 kilometers to the northeast, provides some moisture but minimal moderating effect on air quality due to distance. The city lies within an agricultural belt dominated by coffee, cereals, and livestock farming, with urban expansion creating a gradient from dense central areas to peri-urban zones. This setting impacts air quality through dust from unpaved roads, biomass burning for cooking and heating, and vehicle emissions from growing transportation networks. The surrounding highlands can trap pollutants under stable atmospheric conditions, particularly during cooler months, while the Rift Valley's topography may channel winds that occasionally disperse contaminants. Urban growth without stringent pollution controls exacerbates particulate matter levels, making geographic context crucial for understanding Shashemenē's air quality challenges.

In Shashemenē, air quality fluctuates seasonally due to meteorological and human factors, though peak pollution months vary. During the dry season from October to May, reduced rainfall leads to higher dust levels from unpaved surfaces and agricultural activities, with peak pollution often occurring in the cooler months of November to February. Temperature inversions are common in this highland setting, trapping pollutants near the ground, especially at night and early morning, worsening conditions for sensitive groups like children and the elderly. The wet season from June to September brings relief as rains wash particulate matter from the air, though humidity can occasionally foster fog that mixes with emissions. Wind patterns, influenced by the Rift Valley, generally blow from the northeast, helping disperse pollutants, but calm periods exacerbate stagnation. For outdoor activities, the months of June to August are most favourable due to cleaner air, while November to February should be approached with caution, particularly for those with respiratory issues. Sensitive individuals are advised to limit exertion during early mornings when inversions are strongest and to monitor local conditions during biomass burning episodes. No specific monsoon system affects Shashemenē, but seasonal shifts in precipitation play a key role in air quality dynamics, underscoring the need for adaptive health strategies year-round.