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Oulad Dahmane, nestled within the Médéa province of Algeria, occupies a geographically significant position in the High Atlas Mountains foothills. Located at coordinates 36.3667°N, 3.4667°E, the town’s terrain is characterised by undulating hills and valleys, typical of the Tell Atlas range. The elevation, approximately 800-1000 meters above sea level, influences local climate patterns and air circulation. Unlike coastal Algerian cities, Oulad Dahmane isn’t directly influenced by Mediterranean sea breezes, leading to more continental climate characteristics. The surrounding landscape is predominantly agricultural, with olive groves, orchards, and cereal farming dominating the rural areas. While not a major industrial hub itself, Oulad Dahmane’s proximity to larger towns like Médéa, which possess some light industrial activity, can contribute to regional pollution transport. The urban-rural gradient is relatively sharp; the town itself is compact, quickly transitioning to open farmland. This proximity to agricultural land introduces potential sources of particulate matter from dust and seasonal burning of agricultural waste. The valley location can also trap pollutants during periods of stagnant air, exacerbating local air quality challenges. Understanding these geographical factors is crucial for assessing and mitigating air pollution in Oulad Dahmane.

Air quality in Oulad Dahmane experiences a distinct seasonal rhythm. Spring (March-May) often sees a temporary improvement as rainfall washes away accumulated winter pollutants, though dust from agricultural activities begins to rise. Summer (June-August) is typically drier, with higher temperatures and increased potential for ozone formation, particularly on sunny, still days. However, wind patterns can provide some dispersion. Autumn (September-November) is often the most challenging period. The harvest season brings widespread agricultural burning, releasing significant amounts of particulate matter and contributing to hazy conditions. Temperature inversions become more frequent, trapping pollutants near the ground. Winter (December-February) sees cooler temperatures and reduced sunlight, leading to less ozone formation, but increased reliance on solid fuel for heating, especially in residential areas, elevates particulate matter concentrations. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during autumn and winter months. Monitoring wind direction is key; winds from agricultural areas during burning season should prompt increased caution. Favour outdoor activity on windy days, particularly during the summer, when dispersion is higher.