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Adi Keyh, nestled within the Ma’ĭkel region of Eritrea, occupies a geographically complex position in the nation’s highlands. Located at coordinates 14.8333, 39.3667, the city sits at an elevation of approximately 2,325 meters (7,628 feet) above sea level, contributing to a cooler, more temperate climate than much of the surrounding lowlands. The terrain is characterised by rugged mountains and deep valleys, typical of the Eritrean highlands, influencing wind patterns and creating localized microclimates. Adi Keyh isn’t directly adjacent to a major body of water, though it lies within a region fed by seasonal rainfall and groundwater sources. The surrounding landscape is predominantly agricultural, with terraced farming visible on the slopes, supporting a rural population engaged in subsistence agriculture. While not a heavily industrialised centre, the presence of smaller-scale workshops and the use of biomass for cooking and heating contribute to localised emissions. The urban-rural gradient is relatively sharp; the city itself is compact, quickly transitioning to agricultural land and mountainous terrain. This topography can trap pollutants during periods of calm weather, exacerbating air quality concerns. The city’s position within a rain shadow effect, influenced by the surrounding mountains, also impacts precipitation patterns and pollutant dispersion.

Adi Keyh experiences a distinct wet and dry season, heavily influencing its air quality. The primary rainy season, extending roughly from June to September, generally offers temporary improvements in air quality. Rainfall effectively scrubs particulate matter from the atmosphere, reducing dust and smoke concentrations. However, increased humidity can also promote the formation of mould and allergens. The dry season, spanning October to May, presents the most challenging air quality conditions. During these months, agricultural burning for land preparation becomes prevalent, releasing significant amounts of smoke and particulate matter. Dust storms, originating from the arid lowlands to the west, are also common, particularly between February and April. Temperature inversions, frequently occurring during the cooler nights of the dry season, trap pollutants near ground level. November to January are typically the months with the poorest air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during these periods. The relatively consistent winds from the east during the wet season offer some relief, but localised emissions from cooking and small industries remain a concern year-round. Monitoring wind direction is crucial for predicting pollutant dispersal.