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Nefas Mewch’a, nestled within the Āmara region of Ethiopia at approximately 11.7333° N, 38.4667° E, occupies a geographically significant position within the Ethiopian Highlands. The city’s elevation, averaging around 2,300 meters (7,546 feet) above sea level, immediately influences its climate and, consequently, its air quality. The surrounding landscape is dominated by rugged terrain, characterized by steep slopes and deep valleys, a typical feature of the highlands. This topography can trap pollutants, particularly during periods of low wind. Nefas Mewch’a sits on the edge of a transitional zone between the densely populated central highlands and more sparsely populated agricultural areas. To the east, the landscape gradually descends towards the lowlands, while to the west, it rises further into the highlands. While not directly adjacent to major bodies of water, the city benefits from occasional moisture carried by prevailing winds from the northeast. The Āmara region is a significant agricultural hub, with extensive cultivation of teff, barley, and wheat. While Nefas Mewch’a itself is a relatively small urban center with a population of around 18,691, its proximity to agricultural zones means that dust from farming activities, particularly during the dry season, can contribute to localized air pollution. The urban-rural gradient is relatively sharp, with a clear distinction between the built environment of the city and the surrounding agricultural lands, impacting the dispersal of pollutants. The city’s location within a highland valley further restricts air circulation, potentially exacerbating pollution episodes.

Nefas Mewch’a experiences a distinct wet and dry season pattern, profoundly impacting its air quality. The dry season, typically spanning from October to May, is characterized by lower rainfall and increased dust activity. Strong winds, common during this period, can lift fine particulate matter from agricultural fields and unpaved roads, significantly increasing the concentration of inhalable particles. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are also more frequent during the dry season, hindering vertical mixing and further concentrating pollutants near the ground. The months of January and February often see the highest levels of dust-related air pollution. Conversely, the wet season (June to September) brings increased rainfall, which naturally washes pollutants from the atmosphere, leading to a noticeable improvement in air quality. However, periods of heavy rainfall can also lead to localized flooding, potentially releasing contaminants from soil and waste into the air. Fog, a common occurrence during the wet season, can also trap moisture and pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak dust events. During the wet season, while overall air quality is generally better, periods of heavy rainfall and fog warrant similar precautions. Maintaining indoor air quality through proper ventilation and air filtration is advisable year-round, particularly for vulnerable populations.