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Karia Ba Mohamed, nestled within the Fès-Meknès region of Morocco, occupies a geographically complex position at approximately 34.3667° N, -5.2000° W. The city’s terrain is characterized by rolling hills and valleys, typical of the Middle Atlas mountains, contributing to a relatively moderate elevation. This location, while picturesque, significantly influences its air quality dynamics. Situated near the historic city of Fès, Karia Ba Mohamed experiences a gradual urban-rural gradient, with agricultural lands and olive groves dominating the surrounding landscape. These agricultural zones, while vital to the regional economy, can contribute to particulate matter pollution, particularly during harvest seasons when burning of agricultural waste is sometimes practiced. The proximity to Fès, a major industrial and commercial hub, exposes Karia Ba Mohamed to pollutants transported by prevailing winds. The region's climate is semi-arid, with limited rainfall, which reduces the natural cleansing effect of precipitation. The surrounding landscape is largely composed of dry, scrubby vegetation and rocky outcrops, offering limited buffering against dust storms, a common occurrence in the area. The absence of major bodies of water nearby further restricts natural air purification processes. Topographically, the valley setting can trap pollutants, especially during periods of low wind speed, creating localized air quality challenges. The city’s relatively small size (population 20859) means that localized industrial activity, though limited, can have a disproportionate impact on air quality.

Karia Ba Mohamed’s air quality follows a distinct seasonal pattern dictated by its Mediterranean climate. The dry summer months (June-August) typically see the poorest air quality. High temperatures lead to atmospheric stability, frequently resulting in temperature inversions where a layer of warm air traps cooler air and pollutants near the ground. This inversion effect, coupled with minimal rainfall and often stagnant air, allows particulate matter and other pollutants to accumulate. Dust storms, common during this period, exacerbate the problem, significantly increasing PM10 and PM2.5 concentrations. Spring (March-May) and Autumn (September-November) generally offer improved air quality, with increased wind speeds dispersing pollutants and occasional rainfall washing them from the atmosphere. However, agricultural burning practices during the autumn harvest can temporarily degrade air quality. Winter (December-February) is generally the most favourable season, with cooler temperatures and more frequent rainfall. While fog can occasionally form in the valleys, trapping pollutants, the overall air quality tends to be better than in summer. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months, limiting outdoor activities during peak heat and dust storm events. Maintaining indoor air quality through proper ventilation and air filtration is also recommended. Awareness campaigns promoting responsible agricultural practices and reducing reliance on open burning are crucial for mitigating seasonal pollution peaks.