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Ouled Chebel, nestled within the Blida Province of Algeria, occupies a geographically significant position in the country’s north-central region. Located at coordinates 36.6000, 3.0000, the city sits on the slopes of the Tell Atlas mountain range, a landscape characterized by rolling hills and fertile plains. Its elevation, approximately 150 meters above sea level, contributes to a temperate climate, though susceptible to variations due to its proximity to the Mediterranean Sea, roughly 40 kilometers to the north. The surrounding landscape is predominantly agricultural, with olive groves, vineyards, and cereal crops dominating the rural areas immediately bordering the urban center. Blida, a larger urban hub, lies to the east, creating an urban-rural gradient where Ouled Chebel experiences a blend of agricultural emissions and the spillover effects of regional industrial activity concentrated around Blida and Algiers. The terrain funnels winds from the coast, potentially trapping pollutants during periods of calm. The Mitidja Plain, a large coastal plain, influences local weather patterns and can contribute to temperature inversions, exacerbating air quality issues. The city’s relatively small size (population 16,335) means localized sources, like residential heating and traffic, have a disproportionately large impact on air quality.

Ouled Chebel’s air quality follows a distinct seasonal pattern. Winter (December-February) often sees the poorest air quality, driven by increased reliance on residential heating, particularly wood and charcoal, combined with temperature inversions common in the valley setting. These inversions trap pollutants close to the ground, leading to stagnant air. Spring (March-May) brings improvement as temperatures rise and winds become more frequent, dispersing pollutants. However, agricultural burning of crop residue can temporarily degrade air quality during this period. Summer (June-August) generally offers the cleanest air, with consistent sea breezes flushing out contaminants and high temperatures promoting atmospheric mixing. However, prolonged heatwaves can increase ozone formation. Autumn (September-November) is a transitional period. The return to cooler temperatures and the start of the heating season gradually worsen air quality. Dust storms, originating from the Sahara Desert, are more frequent during autumn and can significantly impact particulate matter levels. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and periods of high dust concentration. Monitoring wind direction is crucial; winds from the south often carry Saharan dust.