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Djemmorah, nestled within the Biskra Province of Algeria, occupies a unique and challenging geographic position. Located at approximately 35.0667° N, 5.8333° E, the city sits on the northern edge of the Sahara Desert, a location profoundly shaping its urban character and air quality. The surrounding landscape is dominated by the rugged Hoggar Mountains to the south, providing a dramatic backdrop and influencing regional wind patterns. The city’s terrain is characterized by a gently sloping plain, punctuated by rocky outcrops and sparse vegetation typical of a semi-arid climate. Biskra itself, a larger urban center, lies just a short distance to the north, representing the closest significant urban influence. The urban–rural gradient transitions rapidly, with the city quickly giving way to expansive desert scrubland and, further afield, the vast Sahara. While Djemmorah lacks direct proximity to major bodies of water, the Chott el Rhouris, a large endorheic salt lake, is situated approximately 60 kilometers to the east, occasionally influencing humidity levels. The region’s agricultural activity, primarily date palm cultivation and cereal farming, is concentrated in oases and irrigated areas around Biskra, potentially contributing to localized dust and agricultural emissions. The absence of significant industrial belts within immediate proximity is a mitigating factor, though transportation corridors connecting Djemmorah to larger Algerian cities can introduce transient pollution. The elevation, relatively low at around 300 meters above sea level, contributes to temperature inversions, a key factor impacting air quality, particularly during cooler months. The desert’s inherent dryness and the prevailing winds from the Sahara are crucial elements in understanding Djemmorah’s atmospheric conditions.

Djemmorah’s air quality experiences a distinct seasonal cycle dictated by its desert climate and meteorological patterns. The winter months (November to February) are typically characterized by cooler temperatures and a higher frequency of temperature inversions. These inversions trap pollutants near the ground, leading to periods of stagnant air and potentially elevated particulate matter concentrations. Dust storms, originating from the Sahara, are also more common during this period, significantly degrading air quality and reducing visibility. Spring (March to May) brings a gradual warming trend and increased wind speeds, which generally disperse pollutants, leading to improved air quality. However, agricultural activities intensify during this season, potentially releasing dust and emissions from machinery. The summer months (June to August) are intensely hot, with minimal rainfall and generally stable atmospheric conditions. While high temperatures can lead to ozone formation, the strong solar radiation and dry air often inhibit its accumulation. The prevailing winds, though sometimes weak, can still provide some degree of ventilation. Autumn (September to October) sees a return of cooler temperatures and a gradual increase in wind speeds, similar to the spring, but with a higher risk of dust events as the Sahara experiences increased wind activity. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and periods of dust storms, limiting outdoor exertion and wearing appropriate respiratory protection. During the hotter summer months, staying hydrated and avoiding prolonged exposure to direct sunlight is crucial.