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Nazrēt, also known as Adama, occupies a strategic position in Ethiopia's central Oromīya region, situated approximately 100 kilometers southeast of Addis Ababa along the vital transportation corridor connecting the capital to the port of Djibouti. The city lies at an elevation of 1,712 meters above sea level within the Ethiopian Highlands' eastern escarpment, where the terrain transitions from the central plateau toward the arid lowlands of the Great Rift Valley. This topographic setting creates a natural basin effect that can trap pollutants, particularly during periods of atmospheric stability. Nazrēt's urban character reflects rapid growth as a major commercial and industrial hub, with expanding manufacturing zones, cement production facilities, and vehicle repair workshops contributing to its general urban pollution sources. The city is surrounded by agricultural lands where subsistence farming and livestock rearing are prevalent, creating a distinct urban-rural gradient where biomass burning for cooking and agricultural residue burning periodically add to the pollution mix. Proximity to Lake Koka, about 30 kilometers to the west, provides some moderating influence on local microclimates but doesn't significantly disperse pollutants due to the region's predominant wind patterns. The city's position along the busy Addis Ababa-Djibouti highway ensures continuous vehicular emissions, while its role as a regional trade center concentrates commercial activity and associated pollution sources within its urban core.

Nazrēt experiences distinct seasonal variations in air quality driven by Ethiopia's tropical monsoon climate, though specific pollution peaks vary annually. During the dry season from October to May, particularly in the months of February through April, pollution typically intensifies due to reduced precipitation, increased dust from unpaved roads and agricultural fields, and more frequent temperature inversions that trap pollutants near the surface. These inversions are especially pronounced in the early morning hours when cold air settles in the city's basin-like topography. The main rainy season from June to September brings temporary relief as rainfall effectively scrubs particulate matter from the atmosphere, though humidity can occasionally combine with emissions to create hazy conditions. Wind patterns show seasonal shifts, with generally stronger winds during transitional months helping to disperse pollutants, while calm periods during peak dry season allow accumulation. Sensitive groups including children, elderly residents, and those with respiratory conditions should be particularly cautious during late dry season months when particulate levels are highest, limiting strenuous outdoor activities to mornings after pollutants have partially dispersed. The short rainy season in March-April provides some intermittent improvement, while the post-harvest period around November often sees increased agricultural burning in surrounding areas. Visitors planning outdoor activities will find the early rainy season months of June and July generally offer the cleanest air, though sudden downpours can temporarily elevate moisture-related discomfort for those with certain health conditions.