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Gwelej, situated in Eritrea’s Gash-Barka region, occupies a geographically significant position within a semi-arid landscape. Located at approximately 14.75°N, 36.72°E and an elevation of roughly 1,800 meters above sea level, the city benefits from a relatively high altitude, which can influence atmospheric mixing and dispersion of pollutants. The surrounding terrain is characterized by undulating plains and scattered hills, typical of the Gash-Barka plateau, transitioning into more rugged highlands further west. This topography can create localized areas of air stagnation, particularly within valleys or behind ridges, hindering pollutant dispersal. Gwelej’s proximity to agricultural zones, primarily focused on sorghum and millet cultivation, introduces potential sources of particulate matter from agricultural practices like burning crop residue, although the scale of this impact is currently limited by the relatively small population. The urban–rural gradient around Gwelej is gradual, with small villages and pastoral lands extending outwards. While not directly adjacent to major bodies of water, the region experiences occasional rainfall, which can temporarily cleanse the air. Currently, Gwelej lacks significant heavy industry; however, the potential for future development, including mining or agricultural processing, could alter its air quality profile. The prevailing winds, generally from the northeast, play a crucial role in transporting pollutants, potentially impacting downwind communities. The city’s layout, still developing, influences local air circulation patterns, with denser areas potentially experiencing poorer air quality than more open spaces.

Gwelej’s air quality is largely dictated by its distinct wet and dry seasons, a characteristic of the Eritrean climate. The dry season, typically spanning from October to May, presents the greatest air quality challenges. During these months, lower rainfall and reduced vegetation cover lead to increased dust levels, significantly impacting particulate matter concentrations. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating the issue. Wind speeds are often lower during this period, further limiting dispersion. The months of January and February often experience the most persistent dust events. Conversely, the wet season (June to September) brings a period of relative air quality improvement. Rainfall effectively washes pollutants from the atmosphere, and increased vegetation growth helps to bind particulate matter to the soil. However, the onset of the monsoon can bring periods of heavy rainfall and associated humidity, which can affect respiratory health for some individuals. Fog, though infrequent, can occur during the cooler months, trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak dust events. Agricultural burning, if practiced, can contribute to localized air pollution spikes, particularly during the transition periods between seasons. Maintaining indoor air quality through ventilation and air filtration is advisable during periods of elevated dust levels.