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Oulad Zemam, nestled within the Béni Mellal-Khénifra region of Morocco, occupies a geographically significant position at approximately 32.35°N, -6.63°W. The town’s location, at an elevation of roughly 550 meters above sea level, places it within a transitional zone between the fertile plains of the Tadla region and the foothills of the High Atlas Mountains. This terrain dictates a varied landscape; the immediate surroundings are characterized by agricultural land, primarily dedicated to olive groves and cereal cultivation, a typical feature of the region’s rural economy. Further afield, the rising slopes of the Atlas Mountains influence local weather patterns and contribute to potential air quality challenges. The proximity to the Oum Er-Rbia River, though not directly adjacent to Oulad Zemam, provides a crucial water source for the surrounding agricultural activities and influences regional humidity. The urban–rural gradient is relatively sharp, with Oulad Zemam acting as a local service center for the surrounding agricultural communities. While not situated within a major industrial belt, the town’s reliance on agricultural machinery and potential for localized burning of agricultural waste can contribute to air pollution episodes. The prevailing winds, generally from the west, carry air masses from the Atlantic, but can be disrupted by the mountain topography, leading to stagnant air conditions and localized pollutant accumulation, particularly during periods of atmospheric stability. The surrounding landscape, a mosaic of cultivated fields and scattered villages, shapes the town’s microclimate and influences the dispersion of pollutants.

Oulad Zemam’s air quality experiences a distinct seasonal cycle dictated by Morocco’s Mediterranean climate. The dry season, spanning roughly from April to October, is characterized by high temperatures and reduced precipitation. This period often sees increased dust intrusion from the Sahara Desert, particularly during the spring months (April-May), significantly impacting air quality. Summer (June-August) brings intense heat, which can exacerbate ground-level ozone formation, a secondary pollutant resulting from reactions involving sunlight and precursor gases. The lack of rainfall during these months also limits the natural cleansing of the atmosphere. Autumn (September-October) offers a slight improvement as temperatures begin to cool, but dust events can persist. The wet season, from November to March, brings cooler temperatures and increased rainfall, which helps to wash pollutants from the atmosphere, leading to generally improved air quality. However, periods of fog, particularly in December and January, can trap pollutants near the ground, creating localized episodes of poor air quality. Temperature inversions, common during the cooler months, also contribute to pollutant accumulation. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of high dust or fog, limiting outdoor activity and ensuring adequate ventilation. Agricultural burning, a practice sometimes employed to clear fields, can also contribute to localized air pollution spikes, particularly during the transition periods between seasons. Avoiding strenuous outdoor activity during the hottest parts of the day in summer is advisable.