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Ouled Moussa, nestled within the Boumerdes province of Algeria, occupies a strategically significant position along the Mediterranean coast, approximately 120 kilometers east of Algiers. The city’s geography is defined by its location at the foothills of the Khroufia massif, a range of the Tell Atlas Mountains, resulting in a varied terrain characterized by gentle slopes transitioning into steeper inclines. Elevation ranges from around 20 meters at the coastal fringe to several hundred meters closer to the mountains, influencing local wind patterns and temperature gradients. The surrounding landscape is a mosaic of agricultural land – primarily olive groves and citrus orchards – interspersed with pockets of maquis shrubland typical of the Mediterranean biome. This agricultural activity, while vital to the regional economy, can contribute to localized air pollution through the use of fertilizers and occasional burning of agricultural waste. The urban–rural gradient is relatively sharp; Ouled Moussa exhibits a distinct urban core gradually blending into the surrounding agricultural and mountainous areas. Its proximity to the Mediterranean Sea introduces a maritime influence, moderating temperatures and contributing to humidity, but also potentially facilitating the transport of pollutants from distant industrial zones along the coast. The city’s location within a relatively narrow coastal plain restricts air dispersion, particularly during periods of calm weather, potentially exacerbating local pollution episodes. The presence of the Khroufia mountains to the north acts as a barrier, further limiting ventilation and trapping pollutants within the valley.

Ouled Moussa’s air quality experiences a distinct seasonal cycle heavily influenced by Mediterranean climate patterns. The dry summer months (June-August) typically see the poorest air quality. High temperatures and minimal rainfall create stable atmospheric conditions, frequently leading to temperature inversions where a layer of warm air traps cooler air and pollutants near the ground. This inversion effect, coupled with reduced wind speeds, significantly limits the dispersion of emissions from local sources, including vehicle traffic and agricultural activities. Dust storms, originating from the Sahara Desert, can also impact air quality during these months, carrying fine particulate matter over long distances. Conversely, the wetter autumn and winter months (October-February) generally bring improved air quality. Increased rainfall helps to wash pollutants from the atmosphere, and more frequent wind events facilitate their dispersal. However, periods of prolonged fog, common during winter, can temporarily trap pollutants, creating localized episodes of reduced visibility and elevated concentrations. Spring (March-May) represents a transitional period, with gradually increasing temperatures and wind speeds leading to a gradual improvement in air quality. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months, limiting outdoor activities during peak heat and avoiding areas with high traffic density. Maintaining indoor air quality through ventilation and air purification can also be beneficial throughout the year, particularly during periods of elevated pollution.