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Oued el Djemaa, nestled within the Relizane province of Algeria, occupies a geographically significant position in the Mitidja plain, a fertile agricultural region west of Algiers. Located at approximately 35.7972° N, 0.6814° E, the city’s elevation is relatively low, averaging around 20 meters above sea level. This low elevation, combined with its position within the plain, contributes to a unique microclimate susceptible to temperature inversions, particularly during cooler months. The surrounding landscape is predominantly agricultural, characterized by olive groves, cereal fields, and vineyards, a typical feature of the Mitidja. To the north, the Mediterranean Sea exerts a moderating influence, though the distance prevents significant coastal breezes from consistently impacting air quality. The urban–rural gradient transitions rapidly, with agricultural land bordering the city limits. While Oued el Djemaa itself is a relatively small town with a population of around 23,480, it sits within a broader regional network. Industrial activity is concentrated further east, towards the larger urban centers of Algiers and Oran, but agricultural practices, including the use of fertilizers and pesticides, can locally influence air quality. The presence of the Oued el Djemaa river, a modest waterway, provides some localized humidity but doesn't significantly alter broader atmospheric circulation patterns. The flat terrain limits dispersion of pollutants, potentially leading to localized build-ups, especially when coupled with unfavorable meteorological conditions.

Oued el Djemaa experiences a Mediterranean climate, dictating a distinct seasonal pattern in air quality. The dry season, spanning roughly from April to October, is generally characterized by higher temperatures and reduced precipitation. This period often sees increased dust and particulate matter concentrations, originating from both local agricultural activities and regional desert sources carried by prevailing winds. Summer months (July-August) are particularly challenging, with intense solar radiation contributing to photochemical smog formation, although the relatively small urban footprint limits the severity. The transition months of spring (April-May) and autumn (September-October) are typically more pleasant, with moderate temperatures and increased wind speeds that aid in pollutant dispersion. However, autumn can also bring Saharan dust events. The wet season, from November to March, brings cooler temperatures and increased rainfall, which naturally helps to cleanse the atmosphere, reducing particulate matter and gaseous pollutants. Fog, particularly during December and January, can trap pollutants near the ground, creating localized episodes of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of high dust or smog. Outdoor activities are generally more favorable during the wetter months, although vigilance regarding fog is advised. Agricultural burning, a common practice in the surrounding areas, can significantly impact air quality during the transition periods, so awareness of local agricultural schedules is beneficial.