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Chahbounia, nestled within the Médéa Province of Algeria, occupies a geographically significant position at approximately 35.55°N, 2.60°E. The city’s terrain is characterized by a gently undulating landscape, part of the Tell Atlas mountains, rising to an elevation of around 800 meters above sea level. This elevation contributes to localized temperature inversions, a key factor influencing air quality. Chahbounia sits within a transitional zone between the Mediterranean coastal plains and the more arid Saharan foothills, resulting in a semi-arid climate. The surrounding landscape is a mosaic of agricultural land – primarily olive groves and cereal crops – interspersed with scrubland and rocky outcrops. To the north, the Mediterranean Sea exerts a moderating influence on temperatures, though its impact on air quality is less direct than other factors. The city’s urban character is relatively compact, reflecting its smaller population of 13,405. While not directly adjacent to major industrial centers, Chahbounia is within reach of industrial zones concentrated further north along the coast, and agricultural practices in the surrounding areas, including fertilizer use and potential burning of crop residues, can contribute to localized pollution. The urban-rural gradient is gradual, with smaller villages and agricultural holdings blending seamlessly into the city’s periphery. The prevailing winds, generally from the northwest, can transport pollutants from coastal industrial areas inland, impacting Chahbounia’s air quality, particularly during certain times of the year. The topography, combined with agricultural activity and proximity to coastal industry, creates a complex interplay of factors affecting the city’s atmospheric conditions.

Chahbounia’s air quality experiences a distinct seasonal cycle dictated by its semi-arid climate and regional weather patterns. The cooler, wetter months (October to March) generally see improved air quality due to increased rainfall, which naturally washes pollutants from the atmosphere. However, periods of fog, common during these months, can trap pollutants near the ground, leading to localized episodes of reduced visibility and potentially elevated concentrations of particulate matter. Spring (April-May) brings a gradual warming trend and increased sunshine, but also the potential for dust storms originating from the Sahara, significantly degrading air quality. Summer (June-September) is typically the most challenging period. High temperatures and prolonged periods of sunshine create stable atmospheric conditions, often leading to temperature inversions where cooler air is trapped beneath a layer of warmer air. This inversion prevents the vertical dispersion of pollutants, resulting in their accumulation near ground level. Agricultural activities, such as harvesting and potential burning of crop residues, also contribute to summer pollution. The dry, hot winds prevalent during this season exacerbate the problem. Autumn (September-October) marks a transition period, with decreasing temperatures and increasing rainfall gradually improving air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months, limiting outdoor activity during peak heat and avoiding areas with visible smoke or dust. Increased ventilation and air filtration can also provide some relief.