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Timahdit, nestled within the Fès-Meknès region of Morocco, occupies a geographically significant position at approximately 33.2369° latitude and -5.0600° longitude. The city’s location, at an elevation of around 1,300 meters (4,265 feet) within the Middle Atlas Mountains, profoundly influences its microclimate and, consequently, its air quality. The surrounding landscape is dominated by rugged, forested hills and valleys, characteristic of the mountainous terrain. This topography creates a natural basin effect, which can trap pollutants under certain meteorological conditions. Timahdit’s proximity to the larger urban center of Fès, roughly 60 kilometers to the north, introduces a regional influence, with potential for transboundary pollution transport. The urban–rural gradient shifts rapidly around Timahdit; the immediate surroundings are primarily agricultural, with terraced fields supporting olive groves and cereal cultivation. Further afield, the landscape transitions to denser forests of cedar and oak. While not directly adjacent to major bodies of water, the nearby Oued Aggai river provides a degree of humidity, which can affect particulate matter dispersion. The absence of large-scale industrial zones within the immediate vicinity is a mitigating factor, though agricultural practices, including burning of crop residues, can contribute to localized air pollution episodes. The mountainous terrain and basin-like structure are key factors shaping Timahdit’s air quality profile, creating both challenges and opportunities for mitigation strategies.

Timahdit’s air quality exhibits a distinct seasonal pattern dictated by its Mediterranean climate and mountainous location. The dry season, spanning roughly from April to October, generally sees lower overall pollution levels due to increased wind speeds and solar radiation, which aids in pollutant dispersion and photochemical degradation. However, this period is punctuated by occasional episodes of dust intrusion from the Sahara Desert, particularly during the late spring and early summer months (May-June), significantly impacting particulate matter concentrations. The cooler, calmer months of autumn (September-November) can experience temperature inversions, trapping pollutants near the ground, especially in the evenings. Winter (December-March) is characterized by colder temperatures and increased fog formation, which further restricts vertical mixing and exacerbates pollution accumulation. Agricultural burning, a common practice during the post-harvest period (October-November), contributes significantly to localized smoke pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor activity during peak pollution hours (early morning and late evening). The spring months (March-April) offer generally improved air quality as temperatures rise and winds increase, but dust events remain a possibility. Overall, avoiding prolonged outdoor exertion during the cooler, calmer periods of autumn and winter, and being mindful of dust alerts during the spring and summer, are crucial for protecting respiratory health in Timahdit.