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Ourtzagh, nestled within the Fès-Meknès region of Morocco, occupies a geographically complex position that significantly influences its air quality. Located at approximately 34.55°N, 4.93°W, the city sits on a gently sloping plateau within the Middle Atlas mountains, at an elevation of around 650 meters above sea level. This elevation, while offering panoramic views of the surrounding landscape, contributes to a localized basin effect, particularly during periods of calm weather. The terrain is characterized by rolling hills and agricultural land, transitioning into more rugged mountainous terrain further afield. The surrounding landscape is predominantly rural, featuring olive groves, cereal fields, and scattered villages, representing a gradual urban-rural gradient. While Ourtzagh itself is a small settlement, its proximity to the larger urban center of Fès (approximately 30km to the northeast) means it is susceptible to the impacts of industrial activity and vehicular emissions originating from that city. The absence of major nearby bodies of water limits the natural cleansing effect of humidity and precipitation. Prevailing winds generally flow from the west, carrying potential pollutants from the Atlantic coast, although the mountainous terrain can disrupt these patterns, creating localized areas of stagnant air. The region’s agricultural practices, including the use of fertilizers and occasional burning of crop residues, can also contribute to localized air pollution episodes. The city’s compact urban form, with closely packed buildings, can further exacerbate the trapping of pollutants, especially during temperature inversions.

Ourtzagh’s air quality experiences a distinct seasonal cycle dictated by Morocco’s Mediterranean climate. The dry season, spanning roughly from April to October, typically sees the poorest air quality. During these months, high temperatures and reduced rainfall create stable atmospheric conditions, frequently leading to temperature inversions where a layer of warm air traps cooler air (and pollutants) near the ground. The lack of rainfall means there's minimal natural cleansing of the atmosphere. Dust storms, common in North Africa, can also significantly degrade air quality, particularly during the spring months (April-May). The summer months (July-August) are often characterized by intense heat and stagnant air, exacerbating the effects of any existing pollution. Conversely, the wet season (November to March) generally brings improved air quality. Increased rainfall helps to wash pollutants from the atmosphere, and stronger winds associated with winter storms disperse them. However, periods of fog, particularly in December and January, can temporarily trap pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of dust storms or stagnant air. Limiting outdoor exertion during the hottest parts of the day and avoiding areas with high traffic density are advisable. During the wetter months, while overall air quality is better, vigilance is still needed during foggy periods.